Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Social and Behavioral Sciences (5571)
- Library and Information Science (3661)
- Arts and Humanities (2258)
- Engineering (1827)
- Education (1588)
-
- Comparative Literature (1383)
- Physical Sciences and Mathematics (814)
- Communication (693)
- Feminist, Gender, and Sexuality Studies (643)
- American Studies (642)
- Rhetoric and Composition (640)
- Film and Media Studies (599)
- European Languages and Societies (596)
- Critical and Cultural Studies (592)
- Reading and Language (592)
- Other Arts and Humanities (583)
- Computer Sciences (560)
- Theatre and Performance Studies (524)
- Other Film and Media Studies (520)
- Television (504)
- Life Sciences (471)
- Civil and Environmental Engineering (443)
- Medicine and Health Sciences (411)
- Civil Engineering (352)
- English Language and Literature (271)
- Psychology (261)
- Engineering Education (230)
- Nanoscience and Nanotechnology (218)
- Business (217)
- Mechanical Engineering (190)
- Keyword
-
- Comparative literature (496)
- comparative literature (488)
- Comparative cultural studies (302)
- comparative cultural studies (297)
- Cultural studies (155)
-
- cultural studies (152)
- Literary theory (136)
- literary theory (135)
- Education (121)
- Information literacy (116)
- Applied sciences (113)
- Problem-based learning (90)
- Media studies (85)
- media studies (84)
- Comparative humanities (81)
- comparative humanities (81)
- Intercultural studies (75)
- Sustainability (75)
- intercultural studies (75)
- Culture and history (73)
- culture and history (73)
- Postcolonial and colonial studies (72)
- postcolonial and colonial studies (72)
- Diasporic, exile, (im)migrant, and ethnic minority writing (71)
- diasporic, exile, (im)migrant, and ethnic minority writing (71)
- Gender studies (68)
- Simulation (68)
- Culture theory (66)
- Feminist studies (66)
- culture theory (66)
- Publication Year
- Publication
-
- Against the Grain (2392)
- CLCWeb: Comparative Literature and Culture (1418)
- International Refrigeration and Air Conditioning Conference (1331)
- The Writing Center Journal (1027)
- International Compressor Engineering Conference (993)
-
- Proceedings of the IATUL Conferences (861)
- The Journal of Purdue Undergraduate Research (650)
- Charleston Library Conference (608)
- Department of Computer Science Technical Reports (474)
- Open Access Dissertations (470)
- CIB Conferences (466)
- Open Access Theses (382)
- Education and Culture (326)
- CTRC Research Publications (295)
- International Conference on Durability of Concrete Structures (285)
- International High Performance Buildings Conference (275)
- Journal of Southeast Asian American Education and Advancement (275)
- Interdisciplinary Journal of Problem-Based Learning (242)
- Purdue Journal of Service-Learning and International Engagement (233)
- Libraries Faculty and Staff Scholarship and Research (229)
- Journal of Aviation Technology and Engineering (212)
- JTRP Technical Reports (200)
- Department of Physics and Astronomy Faculty Publications (199)
- Journal of Pre-College Engineering Education Research (J-PEER) (189)
- Artl@s Bulletin (188)
- Claritas: Journal of Dialogue and Culture (186)
- Birck and NCN Publications (180)
- Department of Electrical and Computer Engineering Technical Reports (166)
- Publications of the Ray W. Herrick Laboratories (138)
- Global Business Languages (137)
- Publication Type
Articles 571 - 600 of 19337
Full-Text Articles in Entire DC Network
Advances In Carbon Capture And Utilization For Production Of Binders And Aggregate, Hongyan Ma
Advances In Carbon Capture And Utilization For Production Of Binders And Aggregate, Hongyan Ma
C3 Symposium 2025
This paper examines various carbon capture and utilization strategies for the decarbonization of cement and concrete, including carbon mineralization and integrated CO2 capture and utilization for the production of supplementary cementitious materials (SCMs), alternative binders, and artificial aggregates, as well as other emerging solutions.
Calcium Nitrate Effectively Mitigates Alkali-Silica Reaction By Surface Passivation Of Reactive Aggregates, Rui Xiao, Dale Prentice, Marie Collin, Magdalena Balonis, Erika La Plante, Mehrdad Torabzadegan, Torben Gadt, Gaurav Sant
Calcium Nitrate Effectively Mitigates Alkali-Silica Reaction By Surface Passivation Of Reactive Aggregates, Rui Xiao, Dale Prentice, Marie Collin, Magdalena Balonis, Erika La Plante, Mehrdad Torabzadegan, Torben Gadt, Gaurav Sant
C3 Symposium 2025
Calcium nitrate (Ca(NO₃)₂, CN) has demonstrated strong potential as an additive to suppress alkali–silica reaction (ASR) in concrete. Its effectiveness is attributed to the formation of precipitates (i.e., barrier or passivation layer) that hinder the dissolution of reactive aggregates. This study investigates the ASR mitigation performance of CN across two cement types—ordinary Type I/II and Portland Limestone Cement (PLC)—in combination with aggregates of varying reactivity and several supplementary cementitious materials (SCMs), including amorphous steel slag and both Class C and Class F fly ashes. Accelerated mortar bar tests, following ASTM C1260 and C1567, show that CN substantially reduces expansion in …
Activation Of Self-Healing In Pozzolanic Natural Hydraulic Lime-Based Self-Compacting Concrete Under Cyclic Compression, Ángel De La Rosa, Gonzalo Ruiz
Activation Of Self-Healing In Pozzolanic Natural Hydraulic Lime-Based Self-Compacting Concrete Under Cyclic Compression, Ángel De La Rosa, Gonzalo Ruiz
C3 Symposium 2025
This study investigates the activation of autogenous self-healing in sustainable pozzolanic hydraulic lime self-compacting concrete under cyclic compressive loading. This cement-free formulation enhances crack closure and mechanical resilience, offering a promising alternative that improves durability and long-term performance for eco-friendly construction and restoration of heritage or low-carbon infrastructure.
Reactivating Recycled Hydrated Cement Into A Value-Added Cementitious Material Using Co2, Hamed Maraghechi, Luis Baquerizo Ibarra, Shayan Gholami, Deepika Sundar, Azadeh Hosseinpanahi
Reactivating Recycled Hydrated Cement Into A Value-Added Cementitious Material Using Co2, Hamed Maraghechi, Luis Baquerizo Ibarra, Shayan Gholami, Deepika Sundar, Azadeh Hosseinpanahi
C3 Symposium 2025
The mineralization of CO₂ from industrial emissions using hydrated cement components, primarily sourced from abundant end-of-life concrete or other waste concrete materials, could provide a unique pathway for reducing GHG emissions associated with the construction industry. Calcium silicate hydrates, along with other hydrated and unhydrated clinker phases, undergo dissolution- precipitation reactions, forming stable calcium carbonates and amorphous decalcified silicate-rich phases, which can be utilized as supplementary cementitious materials. This work demonstrates the characteristics of CO₂ mineralization in hydrated cement paste materials and the resulting products.
Rice Straw Ash As A Sustainable Cementitious Binder: Investigations Into Pretreatment And Performance, Deepak Babu, Athira Gopinath
Rice Straw Ash As A Sustainable Cementitious Binder: Investigations Into Pretreatment And Performance, Deepak Babu, Athira Gopinath
C3 Symposium 2025
As part of its sustainable development goals, India has been promoting biomass-to-energy projects to convert agricultural waste into renewable energy and reduce pollution from the open burning of residues. Rice straw-fuelled power plants in northern India generate large quantities of rice straw ash (RSA) as a by-product. RSA has probable use as a supplementary cementitious material (SCM), but there is limited literature. This study aimed to characterise RSA from three different power plants and investigate its feasibility as an SCM. Analysis revealed that RSA contains silica but has a larger proportion of Potassium Chloride (KCl) contributing to a low strength …
Exploring The Use Of Cattle Manure Digestate Ash For Partial Cement Replacement In The Production Of Concrete, Georges Fahd Khoury, Jessica Ensini, Francesca Ferretti, Enrico Sassoni, Marco Bovo, Claudio Mazzotti
Exploring The Use Of Cattle Manure Digestate Ash For Partial Cement Replacement In The Production Of Concrete, Georges Fahd Khoury, Jessica Ensini, Francesca Ferretti, Enrico Sassoni, Marco Bovo, Claudio Mazzotti
C3 Symposium 2025
The paper investigates, through preliminary tests on mortar mixes, the possibility of substi-tuting a relevant percentage of cement with cattle manure ash for production of sustainable concretes.
Low-Carbon Supplementary Cementitious Materials (Scms) From Waste Stamp Sands, Xiang Zhao, Qingli Dai
Low-Carbon Supplementary Cementitious Materials (Scms) From Waste Stamp Sands, Xiang Zhao, Qingli Dai
C3 Symposium 2025
Addressing the critical challenge of reducing CO₂ emissions in the cement industry involves utilizing waste stamp sands as a sustainable source for supplementary cementitious materials (SCMs). Stamp sands, abundant in Michigan's Upper Peninsula, contain silicate minerals that can be converted into high-performance SCMs, enabling reductions in clinker usage and overall carbon emissions [1].Therefore, this study investigated the potential of waste stamp sands from Lake Superior (Gay, MI) as SCMs through calcination. Compositional analysis revealed that the sands contained silicate minerals such as albite, diopside, and anorthite, making them suitable for pozzolanic activity [2, 3]. Calcination at 800–900°C transformed these crystalline …
Advancing The Use Of Supplementary Cementitious Materials: A Novel Framework For Quantitative Reactivity Estimation, Bryan Aylas-Paredes, Rohan Bhat, Narayanan Neithalath, Aditya Kumar
Advancing The Use Of Supplementary Cementitious Materials: A Novel Framework For Quantitative Reactivity Estimation, Bryan Aylas-Paredes, Rohan Bhat, Narayanan Neithalath, Aditya Kumar
C3 Symposium 2025
The partial replacement of Portland cement (PC) with supplementary cementitious materials (SCMs) presents an effective strategy to reduce CO2 emissions associated with cement production while preserving essential mechanical properties and durability. SCMs, such as fly ash, blast furnace slag, calcined clays, and other aluminosilicate-rich materials, enhance sustainability through their pozzolanic and hydraulic reactivity. Despite their significant potential, the widespread adoption of SCMs has been limited by the absence of straightforward and quantitative methods to assess their reactivity‒a crucial property influenced by chemical composition, amorphous content, and particle fineness. To overcome these challenges, this study proposes a novel, simplified quantitative method …
Enhancing The Reactivity Of Steel Slag For High-Quality Scms, Laura Stefanini, Luke Hunter, K. H. C. Yap, Grace Gledden, Salvador Marval, Alex Dawes, Frederic Scott, Eliot Brooks, William J. Knapp
Enhancing The Reactivity Of Steel Slag For High-Quality Scms, Laura Stefanini, Luke Hunter, K. H. C. Yap, Grace Gledden, Salvador Marval, Alex Dawes, Frederic Scott, Eliot Brooks, William J. Knapp
C3 Symposium 2025
The transition towards more sustainable steelmaking methods, such as electric arc furnace (EAF) processes, is driving a significant increase in the production of electric arc furnace slag (EAFS). Unlike ground granulated blast furnace slag (GGBFS), a widely used by-product of traditional blast furnace-basic oxygen furnace (BF-BOF) processes, EAFS currently has limited applications, primarily as aggregate in concrete or asphalt, with large volumes landfilled. Efforts to utilise EAFS as a supplementary cementitious material (SCM) have shown mixed outcomes due to its low inherent reactivity and variability in properties. Our research focuses on developing a process to enhance the reactivity of EAFS …
Autoclave Curing Of Cement Pastes With Sugarcane Bagasse Ash, Carolina Albuquerque Da Silva, Kejin Wang2, Dayana Cristina Silva Garcia
Autoclave Curing Of Cement Pastes With Sugarcane Bagasse Ash, Carolina Albuquerque Da Silva, Kejin Wang2, Dayana Cristina Silva Garcia
C3 Symposium 2025
This study proposes an alternative way of using sugar cane bagasse ash (SCBA) in cementitious materials by investigating the influence of autoclave curing on the microstructure of cement paste. Samples were prepared with 0%, 10%, 20%, 30%, 40%, and 50% SCBA as a replacement for cement. Two curing methods were used for the pastes: room temperature curing and autoclave curing. The results showed that the samples cured at room temperature showed similar microstructure development, while distinct hydration products formed under autoclave curing. Tobermorite and traces of xonotlite were detected in samples with high SCBA content, and traces of α-C2SH were …
Improvement Of Lithium-Metal Electrode All-Solid-State Batteries Performance By Shot Peening And Magnetron Sputtering, Atsuro Okumura, Manabu Kodama
Improvement Of Lithium-Metal Electrode All-Solid-State Batteries Performance By Shot Peening And Magnetron Sputtering, Atsuro Okumura, Manabu Kodama
15th International Conference on Shot Peening
To enable fast charging in lithium-metal anode all-solid-state batteries, suppressing lithium dendrite formation at the solid electrolyte (SE) interface is critical. Increasing fracture toughness via shot peening (SP) and improving interfacial contact with Au sputtering can inhibit dendrite growth. However, conventional sputtering may reduce toughness due to localized thermal damage. This study investigated magnetron sputtering as a low-damage, plasma-based Au deposition method. SEs with and without SP were fabricated and coated via normal and magnetron sputtering. Critical current density (CCD) and fracture toughness were evaluated. Without SP, CCD improvement was limited regardless of sputtering method due to poor bonding. With …
Investigation Of Topography Changes Of Blasted Surfaces: An Experimental Perspective Using Fiducial Markers, Stefanie Stoeckel, Sophie Groeger
Investigation Of Topography Changes Of Blasted Surfaces: An Experimental Perspective Using Fiducial Markers, Stefanie Stoeckel, Sophie Groeger
15th International Conference on Shot Peening
Abrasive blasting is a process that intentionally modifies surface topography to meet specific functional requirements. The blast media is accelerated and interacts directly with the surface through impact. It is evident that the number of impacts and the overlap increase with time. This study aims to investigate these alterations to surface topography through repeated examinations of the same location. A methodology has been developed that employs the use of fiducial markers, which are protected during blasting by a custom 3D-printed cover. This method was used to observe changes in the topography of smooth and rough initial surfaces that had been …
Anisotropic Residual Stress Measurements In Additively Manufactured 316 Stainless Steel Parts, Rajeshree Varma, Donovan Stumpf, Paul R. Mort
Anisotropic Residual Stress Measurements In Additively Manufactured 316 Stainless Steel Parts, Rajeshree Varma, Donovan Stumpf, Paul R. Mort
15th International Conference on Shot Peening
Additive manufacturing (AM) using laser powder bed fusion (L-PBF) is increasingly used to produce complex parts for industries like aerospace and medical devices. The intrinsic characteristics of AM – layer-wise deposition and rapid thermal cycling – generate significant, anisotropic, residual stresses that can compromise part quality and performance. Recent studies highlight how these stresses are strongly influenced by process parameters and build orientation. X-ray diffraction (XRD) techniques, including sin²ψ and advanced two-dimensional approaches, have become the preferred methods for non-destructive, directionally resolved measurement of residual stress in AM metals. This review surveys advancements in XRD residual stress methods with a …
Enhancing High Cycle Fatigue Perfomance Of Electron Beam Melted Ti6al4v: A Study On Shot Peening And Hot Isostatic Pressing, Naghmeh M. Mojib, Dwayne D. Arola, Ramulu Mamidala
Enhancing High Cycle Fatigue Perfomance Of Electron Beam Melted Ti6al4v: A Study On Shot Peening And Hot Isostatic Pressing, Naghmeh M. Mojib, Dwayne D. Arola, Ramulu Mamidala
15th International Conference on Shot Peening
The qualification of electron beam powder bed fusion (PBF-EB) for safety-critical applications is hindered by variability in high cycle fatigue performance, largely due to surface roughness and internal defects. While Hot Isostatic Pressing (HIP) effectively reduces internal porosity, it does not address surface-initiated fatigue failures. This study investigated the combined effects of HIP and shot peening on enhancing the fatigue performance of PBF-EB Ti6Al4V. Over 50 specimens, including both vertical and horizontal build orientations, underwent high cycle fatigue testing per ASTM E466. X-Ray computed tomography confirmed decrease in defect distribution following HIP, while shot peening resulted in a more uniform …
Comparison Of Peening Effect Between Additive Manufacutred And Drawing Titanium Alloy, Hitoshi Soyama
Comparison Of Peening Effect Between Additive Manufacutred And Drawing Titanium Alloy, Hitoshi Soyama
15th International Conference on Shot Peening
Although additively manufactured (AM) metals are attractive materials, their remarkable weak fatigue properties are an obstacle to their practical application. Thus, post-processing to improve their fatigue properties is required. In the present study, powder bed fusion using laser sintering titanium alloy, i.e., PBF-LS/Ti6Al4V was treated by shot peening (SP), submerged laser peening (SLP), cavitation peening (CP), and fine particle bombarding (FPB), then the fatigue properties were investigated by a torsional fatigue test, comparing with drawing Ti6Al4V. It was revealed that the fatigue strength at 107 was 446 ± 5 MPa for PBF-LS/Ti6Al4V treated by FPB+CP, 359 ± 9 MPa …
Influence On Shot Peening And Blast Polishing For Rotating Bending Fatigue Strength Of Vacuum Carburized Steel With Circumferential Notch, Yuji Kobayashi, Hayato Taniguchi, Kiyotaka Masaki
Influence On Shot Peening And Blast Polishing For Rotating Bending Fatigue Strength Of Vacuum Carburized Steel With Circumferential Notch, Yuji Kobayashi, Hayato Taniguchi, Kiyotaka Masaki
15th International Conference on Shot Peening
In order to improve fuel efficiency in automobiles, weight reduction is necessary as well as improving engine efficiency. For transmission gears, thickness reduction is necessary for weight reduction. When the thickness is reduced, the cross-sectional area becomes smaller, and the load stress increases. Therefore, higher fatigue strength is required. Most gears carry out carburizing. Shot peening is often used to improve the fatigue strength of carburized heat-treated parts. After shot peening, compressive residual stress is introduced, but at the same time, surface roughness is increased. Therefore, the processing conditions of shot peening are very important. Blast polishing is a processing …
Investigations On The Fatigue Strength Of Threads Produced By Different Fabrication Techniques, Philippe Du Maire, Jürgen Hoffmeister, Andreas Öchsner, Michael Johlitz
Investigations On The Fatigue Strength Of Threads Produced By Different Fabrication Techniques, Philippe Du Maire, Jürgen Hoffmeister, Andreas Öchsner, Michael Johlitz
15th International Conference on Shot Peening
The increasing importance of sustainability in engineering demands the development of long-lasting, high-performance components that reduce material and energy consumption over time. This study investigates how different thread manufacturing processes, i.e., cutting, rolling, and deep rolling, affect the fatigue strength of bolts made from 42CrMo4+QT steel. Cylindrical specimens with M12 threads were subjected to cyclic tensile loading with constant mean stress. Fatigue strength was evaluated using the staircase method, and supporting analyses included X-ray diffraction for residual stress, and full width half maximum examination and Vickers microhardness measurements. Results show that thread rolling significantly improves fatigue strength, achieving 113.8 MPa …
Numerical Assessment Of Shot Peening Contribution To The Fatigue Strength Of Gear Tooth Root, Gurutz Cortabitarte Laucirica, Xuban Telleria, Iñigo Llavori, Ibai Ulacia, Miren Larrañaga, Jon Ander Esnaola
Numerical Assessment Of Shot Peening Contribution To The Fatigue Strength Of Gear Tooth Root, Gurutz Cortabitarte Laucirica, Xuban Telleria, Iñigo Llavori, Ibai Ulacia, Miren Larrañaga, Jon Ander Esnaola
15th International Conference on Shot Peening
Gears are commonly treated with shot peening (SP) and/or case hardening to enhance fatigue resistance. However, their effects are often conservatively assessed using standardized methods, which can limit their optimal application in industrial components. Particularly, the effect of SP over case-hardened gears remains insufficiently explored. Therefore, the present study evaluates the contribution of SP on single tooth bending fatigue (STBF) strength of raw and case-hardened spur gears, commonly used in automotive and heavy machinery industries. In the study four conditions are addressed: (i) untreated, (ii) case-hardened, (iii) shot-peened, and (iv) case-hardened and shot-peened. First, the residual stress field of the …
Effect Of Fine Particle Peening Induced Material Transfer On The Initial Deposition Behavior Of Nickel Electroplating On Aluminum Substrate, Kazuki Iijima, Yutaka Kameyama, Hideaki Sato, Shuhei Kodama
Effect Of Fine Particle Peening Induced Material Transfer On The Initial Deposition Behavior Of Nickel Electroplating On Aluminum Substrate, Kazuki Iijima, Yutaka Kameyama, Hideaki Sato, Shuhei Kodama
15th International Conference on Shot Peening
Plating on aluminum requires a complex zincate pretreatment. Fine Particle Peening (FPP), using particles ≤200 µm, has gained attention as an alternative due to its ability to transfer particle components onto the surface, potentially improving deposition and adhesion. Previous studies showed enhanced plating on aluminum treated with steel particles. This study investigates the effectiveness of FPP as a pretreatment for nickel electroplating by examining initial deposition behavior. A1050-H24 aluminum was treated using FPP with either steel or glass particles, compared to an untreated specimen. Steel particle FPP created a lamellar microstructure with alternating iron and aluminum phases. EBSD revealed that …
The Effect Of Surface Treatment On The Fatigue Strength Of Sus316l Additive Manufactured Products, Hitoshi Nishijima, Yuji Kobayashi, Toshiya Tsuji, Kiyotaka Masaki
The Effect Of Surface Treatment On The Fatigue Strength Of Sus316l Additive Manufactured Products, Hitoshi Nishijima, Yuji Kobayashi, Toshiya Tsuji, Kiyotaka Masaki
15th International Conference on Shot Peening
Rotating bending fatigue tests were conducted to investigate the effect of shot peening and barrel finishing on fatigue properties of SUS316L made by laser PBF which was one of additive manufacturing processes. Surface roughness, residual stress, and fatigue strength were investigated for each specimen. As a result, the fatigue strength of the barrel finished specimens was almost same or better than that of the shot peened specimens. Barrel finished specimens increased 4.1 times higher fatigue strength than as-built specimens. The surface roughness of the specimens after barrel finishing was reduced by up to 96% compared to the as-built specimens. On …
Enhancing The Fatigue Strength Of Am Materials Via Mechanical Surface Treatment, Fabian Keil, Jan Schubnell, Sascha Fliegener, Alexander Heiss
Enhancing The Fatigue Strength Of Am Materials Via Mechanical Surface Treatment, Fabian Keil, Jan Schubnell, Sascha Fliegener, Alexander Heiss
15th International Conference on Shot Peening
Additive manufacturing (AM) processes, while enabling the production of intricate geometries, frequently result in suboptimal surface quality, which can significantly restrict the fatigue strength of components when compared to those manufactured using traditional methods. This study explores the effectiveness of mechanical surface treatment (MST) techniques, specifically shot peening and deep rolling, in enhancing the fatigue performance of additively manufactured AlSi10Mg and 316L alloys. A combination of experimental investigations and finite element simulations was employed to evaluate the influence of these treatments on surface integrity, microstructure, and fatigue life. The results reveal that both MST approaches lead to substantial improvements in …
Dynamic Flowsheet Modeling Of Shot Peening Processes, Langdon Feltner, Paul Mort
Dynamic Flowsheet Modeling Of Shot Peening Processes, Langdon Feltner, Paul Mort
15th International Conference on Shot Peening
Process flowsheet modeling is used to map and predict performance by integrating sub-models within a system. This paper presents a dynamic flowsheet for shot peening used to track the effects of media characteristics, removal of worn media, and replenishment thereof. Input parameters include media characteristics, media feed rate, velocity (i.e., air pressure), effective impact area (i.e., nozzle setup), and recharge replenishment. The media working mix is described dynamically using tri-modal size and shape characteristics: as-manufactured, conditioned, and worn modes, each having impact-dependent rate coefficients for transition to the next mode, i.e., as-manufactured > conditioned > worn > debris. The flowsheet includes the effect …
Effects Of Laser Peening On Fatigue Properties Of Welded Aluminum Thin Plates, Kiyotaka Masaki, Yoshio Mizuta, Satoshi Tamaki, Yuji Sano
Effects Of Laser Peening On Fatigue Properties Of Welded Aluminum Thin Plates, Kiyotaka Masaki, Yoshio Mizuta, Satoshi Tamaki, Yuji Sano
15th International Conference on Shot Peening
To improve the fatigue properties of welded aluminum alloy thin plates used in transportation machinery, handheld laser peening (HH-LP) was applied to 2 mm-thick A5083-O specimens prepared by bead-on TIG welding. Conventional laser peening often causes warping in thin plates, but the HH-LP treatment using low-energy laser pulses avoids this problem. The HH-LP treatment introduced compressive residual stresses of over 200 MPa on the heat-affected zone (HAZ) of the welded specimens. Fatigue tests under plane bending conditions revealed that the HH-LP treatment significantly improved the fatigue strength of the welded specimens, achieving a level comparable to that of the base …
Origin And Interpretation Of Psi-Splitting And Out Of Plane Shear Stress When Using Diffraction Techniques, Mohammed Belassel, James A. Pineault, Michael E. Brauss
Origin And Interpretation Of Psi-Splitting And Out Of Plane Shear Stress When Using Diffraction Techniques, Mohammed Belassel, James A. Pineault, Michael E. Brauss
15th International Conference on Shot Peening
Psi-splitting is a phenomenon often observed in interplanar d-spacing vs. sin²ψ plots during the analysis of residual stress measurement data when employing the X-ray diffraction (XRD) method. Deviations from the expected linear relationship between interplanar d-spacing and sin²ψ are typically caused by the presence of out-of-plane shear stresses or inhomogeneous stress distributions within the measured phase of the material. In such cases, the d-spacing values measured at different ψ tilt angles deviate from the anticipated linear trend, resulting in a characteristic splitting of the d-spacing vs. sin²ψ plot data, where the shape of the data in the plot takes the …
Evaluation Of Peening Intensity With Nozzle-Mounted Sensor During Processing, Akinori Matsui, Shuji Hayashida, Yuji Kobayashi
Evaluation Of Peening Intensity With Nozzle-Mounted Sensor During Processing, Akinori Matsui, Shuji Hayashida, Yuji Kobayashi
15th International Conference on Shot Peening
In recent years, digital technologies have been increasingly applied in manufacturing, including visualization and anomaly detection in production equipment. In shot peening, Peening Intensity is a key process control indicator, but its measurement requires significant manual effort. This study aims to evaluate the possibility of using an AE-sensor-mounted nozzle to estimate Peening Intensity. We conducted experiments comparing sensor outputs with experimented Intensity under controlled conditions. A strong correlation (R2 ≥ 0.95) was observed, suggesting that Peening Intensity can be estimated via AE sensing. This approach may contribute to labor-saving and automation in shot peening processes.
Comparison Of Anti-Fouling Performance Of Textured Glass Surface Fabricated By Ductile-Mode Peening And Precision Grinding, Hayato Tagaya, Yutaka Kameyama, Shuhei Kodama, Hideaki Sato, Kento Shinagawa, Ayumu Sekiguchi, Seiji Hirai, Hitoshi Ohmori
Comparison Of Anti-Fouling Performance Of Textured Glass Surface Fabricated By Ductile-Mode Peening And Precision Grinding, Hayato Tagaya, Yutaka Kameyama, Shuhei Kodama, Hideaki Sato, Kento Shinagawa, Ayumu Sekiguchi, Seiji Hirai, Hitoshi Ohmori
15th International Conference on Shot Peening
Recently, there has been a growing demand for precision processing glass. In addition to dimensional accuracy, surface texturing to impart functional properties has attracted increasing attention. For example, anti-fouling performance against powder adhesion is required for cover glasses of solar cells. Powder adhesion is governed by van der Waals forces, which depend on the surface texture of the substrate, suggesting that surface structures influence adhesion behavior. Our previous study demonstrated that angled fine particle peening (FPP) could fabricate a nanoscale fine texture on glass surfaces through ductile-mode peening—glass processing without brittle fracture. In this study, the effect of surface texturing …
Evaluating The Effectiveness Of Localized Masking To Prevent Changes In Residual Stress When Shot Peening, James R. Harrison, James Pineault, Tom Mills
Evaluating The Effectiveness Of Localized Masking To Prevent Changes In Residual Stress When Shot Peening, James R. Harrison, James Pineault, Tom Mills
15th International Conference on Shot Peening
When shot peening components, it is common practice to mask certain localized regions where peening roughness is not desirable. For example, surfaces that have been highly machined such as bearing races or areas of interference-fit may require masking to protect them from the cold working effects of shot peening. Oftentimes shot peening the grip sections of fatigue test coupons can prevent cracking and failures due to fretting fatigue in the grip area but could affect the outcome of the test if applied to the gauge section of the coupons. Thus, maintaining an “as machined” surface roughness is the most common …
Microstructural Changes And Residual Stress Generation On The Periodically Patterned Surface Texture Fabricated By Angled Fine Particle Peening, Yutaka Kameyama, Hideaki Sato, Ryokichi Shimpo
Microstructural Changes And Residual Stress Generation On The Periodically Patterned Surface Texture Fabricated By Angled Fine Particle Peening, Yutaka Kameyama, Hideaki Sato, Ryokichi Shimpo
15th International Conference on Shot Peening
Focusing on the potential of peening technology as a surface texturing technique, angled fine particle peening (angled-FPP) has been proposed to fabricate a specific periodical surface structure, which possibly provides various surface functions. It is necessary to further characterize the textured surface to earn more advantages from angled-FPP. Thus, in this paper, texture formation phenomena, residual stress, and microstructural changes were investigated on the angled-FPP specimens.
Roughness Parameters For Evaluating Blasted Or Shot Peened Surfaces, Stefanie Stoeckel, Sophie Groeger
Roughness Parameters For Evaluating Blasted Or Shot Peened Surfaces, Stefanie Stoeckel, Sophie Groeger
15th International Conference on Shot Peening
A review of the papers presented at the last three International Conferences on Shot Peening revealed that the most used parameters are Ra and Rz. There has been comparatively little exploration of other parameters, particularly the S-parameters. Furthermore, the ISO 4287 standard for profile parameters was replaced by the new ISO 21920-2 standard in 2021. This is accompanied by the introduction of new parameters as well as alterations to existing ones. This paper demonstrates the limitations of Ra and Rz, as well as Sa and Sz, and explores additional areal and profile parameters that are useful for the description of …
Improving Fatigue Strength And Life Of Single Crystal Cmsx-4, Jochen Peter Fuhr, Lloyd Hackel, Nicolau I. Morar, Noah Holtham, Keivan Davami, Montu Sharma, Rajkumar Roy
Improving Fatigue Strength And Life Of Single Crystal Cmsx-4, Jochen Peter Fuhr, Lloyd Hackel, Nicolau I. Morar, Noah Holtham, Keivan Davami, Montu Sharma, Rajkumar Roy
15th International Conference on Shot Peening
The deep penetration of laser peening (LP) and retention of residual stress at high temperature by LP is significant in improving fatigue life and strength of superalloys exposed to high temperature and corrosion. Single crystal CMSX-4, was evaluated for stress relaxation and both fatigue life and fatigue strength of material that was LP-treated compared to non-LP and shot-peened (SP) specimens. LP was done with multiple layers using a 20 J/pulse laser where the laser high energy enabled using a 5 mm spot size on the metal surface. Stress measurements by the slitting technique showed the plastic penetration depth exceeded SP …