Cold-Formed Steel Strength Predictions For Combined Bending And Torsion,
2023
China University of Geosciences (Beijing)
Cold-Formed Steel Strength Predictions For Combined Bending And Torsion, Yu Xia, Robert S. Glauz, Benjamin W. Schafer, Michael Seek, Hannah B. Blum
Engineering Technology Faculty Publications
Locally slender cross-section members, such as cold-formed steel Cee and Zee sections, are susceptible to significant twisting and high warping torsion stresses. Torsion considerations are complicated by whether it is derived as a first-order effect from loading or a second-order effect from instability. The current design for combined bending and torsion interaction has some limitations, including only considering the first yield in torsion and ignoring the cross-section slenderness in torsion. Previous work has derived a simple uniform equation to predict the bimoment capacity and two bimoment strength curves for local and distortional buckling under torsion only. This work is extended …
Phenomenological Analysis Of Surface Degradation Of Metallic Materials In Extreme Environment,
2023
Missouri Unviersity of Science and Technology
Phenomenological Analysis Of Surface Degradation Of Metallic Materials In Extreme Environment, Simon N. Lekakh, Oleg Neroslavsky
Materials Science and Engineering Faculty Research & Creative Works
The resistance to surface degradation in metallic alloys plays an important role for the lifetime of the components working in harsh environments. The mechanisms involved in degradation of metallic surface in a high-temperature aggressive gaseous atmosphere include the following: forming adherent to the surface multiphase oxide layer, partial spallation, and possible vaporization of formed compounds. The governing equation, which describes a parabolic growth of adherent layer, time-dependent vaporization, and cross-linked to instantaneous thickness of adherent layer spallation rate, was suggested and analyzed. The several relationships between the kinetic constants were defined from analysis of the governing equation. Design of routes …
Microstructure Evolution And Austenitic Grain Refinement Of Ti-Modified High Mn Steels During Solution Annealing Heat Treatment,
2023
Missouri University of Science and Technology
Microstructure Evolution And Austenitic Grain Refinement Of Ti-Modified High Mn Steels During Solution Annealing Heat Treatment, Abhinav Karanam, Arnab Sarkar, Erik Nenzen, Viraj Ashok Athavale, Mark Watson, Laura Nicole Bartlett, Lukas Bichler
Materials Science and Engineering Faculty Research & Creative Works
Austenitic high manganese (Mn) steels are often used in harsh environments due to their high toughness and wear resistance. Heat treatments are performed to engineer the microstructure of the steels and optimize their performance for the desired service conditions. This study investigated the effect of titanium (Ti) and heat treatment on the microstructure of cast high Mn steel (HMS) alloys. The results reveal that Ti addition contributed to grain refinement in the as cast and heat-treated conditions. In-situ observation of microstructure evolution up to 1125 °C confirmed the stability of precipitated TiC particles, while revealing a new mechanism of grain …
Residual Stress Distribution, Distortion, And Crack Initiation In Conventional And Intensive Quench Practices,
2023
Missouri University of Science and Technology
Residual Stress Distribution, Distortion, And Crack Initiation In Conventional And Intensive Quench Practices, Kingsley Tochukwu Amatanweze, Mario F. Buchely, Viraj Ashok Athavale, Laura Bartlett, Ronald J. O'Malley, Toshi Suzuki
Materials Science and Engineering Faculty Research & Creative Works
This study evaluates the effect of two different quench practices on distortion, sensitivity to quench cracking, development and distribution of residual stress, microstructural uniformity, and hardenability of standardized test castings. Navy C-rings made of AISI 4340 were quenched in this experiment. Some rings were quenched in a conventional draft tube immersion quench bath, and others were quenched in an intensive quench spray system to compare with the results from the conventional immersion quench bath. The rings were measured with a coordinate measuring machine, for distortion and flatness, before and after quenching. Hardness profiles of the quenched rings showed through hardness …
Compositional Modifications To Alter And Suppress Laves Phases In Alxcrmotayti Alloys,
2023
Missouri University of Science and Technology
Compositional Modifications To Alter And Suppress Laves Phases In Alxcrmotayti Alloys, Austin E. Mann, Joseph William Newkirk
Materials Science and Engineering Faculty Research & Creative Works
Herein, the Development of Refractory Complex Concentrated Alloys in the Al–Cr–Mo–Ta–Ti Alloy System is Reported. Alloys with Modified Al and Ta Concentrations Are Designed using CALPHAD Tools and Produced Via Arc Melting and Characterized in Both As-Cast and Annealed Forms. Properties of the Alloys, Nature of the Microstructures, and Phase Transformation Behavior Are Described Via X-Ray Diffraction, Microstructural Characterization, Microhardness, and Differential Scanning Calorimetry. Two Alloys, Namely, Al0.25CrMoTa0.8Ti and Al0.75CrMoTa0.8Ti, Are Represented by a Body-Centered-Cubic Matrix Phase after Annealing, along with a Secondary Cr–Ta Laves Phase of the C15 and C14 Polytypes, respectively. in As-Cast and Annealed Forms, the Al0.75CrMoTa0.45Ti …
Characterization Of Virgin, Re-Used, And Oxygen-Reduced Copper Powders Processed By The Plasma Spheroidization Process,
2023
Missouri University of Science and Technology
Characterization Of Virgin, Re-Used, And Oxygen-Reduced Copper Powders Processed By The Plasma Spheroidization Process, M. Hossein Sehhat, David Perez-Palomino, Connor Wiedemeier, Tristan Cullom, Joseph William Newkirk
Materials Science and Engineering Faculty Research & Creative Works
Fabrication of parts with high mechanical properties heavily depend on the quality of powder deployed in the fabrication process. Copper powder in three different powder types were spheroidized using radio-frequency inductively coupled plasma (ICP) spheroidization process (TekSphero-15 system). The characterized powders include virgin powder as purchased from the powder manufacturer, powder used in electron beam powder bed fusion (EB-PBF) process, and reconditioned powder, which was used powder that underwent an oxygen-reduction treatment. The goal of spheroidizing these powder types was to evaluate the change in powder morphology, the possibility of enhancing the powder properties back to their as-received conditions, and …
Characterization Of Virgin, Re-Used, And Oxygen-Reduced Copper Powders Processed By The Plasma Spheroidization Process,
2023
Missouri University of Science and Technology
Characterization Of Virgin, Re-Used, And Oxygen-Reduced Copper Powders Processed By The Plasma Spheroidization Process, M. Hossein Sehhat, David Perez-Palomino, Connor Wiedemeier, Tristan Cullom, Joseph William Newkirk
Materials Science and Engineering Faculty Research & Creative Works
Fabrication of parts with high mechanical properties heavily depend on the quality of powder deployed in the fabrication process. Copper powder in three different powder types were spheroidized using radio-frequency inductively coupled plasma (ICP) spheroidization process (TekSphero-15 system). The characterized powders include virgin powder as purchased from the powder manufacturer, powder used in electron beam powder bed fusion (EB-PBF) process, and reconditioned powder, which was used powder that underwent an oxygen-reduction treatment. The goal of spheroidizing these powder types was to evaluate the change in powder morphology, the possibility of enhancing the powder properties back to their as-received conditions, and …
Recycling Metal Chips Into Usable Materials,
2023
The University of Akron
Recycling Metal Chips Into Usable Materials, Alex Mortensen, Ben Mortensen
Williams Honors College, Honors Research Projects
This report entails the scope, design considerations, and plans for creating a metal chip converter into metal briquettes. The construction is a set of machines with multiple processes to make the conversion happen. The process includes washing fine metal chips, drying them off, compressing them, and melting them down into usable briquettes. This project is intended to make a simple process to recycle metal chips into usable material for reuse. The project's objective is to reduce the costs of storage and recycling waste by offering a solution to recycle it into materials the shop can reuse.
An Updated Analytical Method For Predicting The Bracing Behavior Of Z-Purlin Supported Standing Seam Diaphragm Systems,
2023
Old Dominion University
An Updated Analytical Method For Predicting The Bracing Behavior Of Z-Purlin Supported Standing Seam Diaphragm Systems, Michael W. Seek
Engineering Technology Faculty Publications
Roof systems utilizing Z-purlins as a secondary member supporting a standing seam panel system are used extensively by the metal building industry. The Z-purlins rely on the diaphragm action in the standing seam panel system to provide lateral support and transfer forces to anchorages. The behavior of the standing seam system is highly nonlinear making prediction of the interaction between the Z-purlin and the standing seam system difficult. To better understand the behavior of the interaction between the purlins and the panel system, a series of non-linear shell finite element models were developed based on the test results of simple …
Machine Learning Strategies For Potential Development In High-Entropy Driven Nickel-Based Superalloys,
2023
Missouri State University
Machine Learning Strategies For Potential Development In High-Entropy Driven Nickel-Based Superalloys, Marium Mostafiz Mou
Graduate Theses/Dissertations
In this study, I developed Deep Learning interatomic potentials to model a multi-phase and multi-component system of Ni-based Superalloys. The system has up to three major phase constituents, namely Gamma, Gamma Prime, and Transition-metal rich Carbide. I utilized invariant scalar-based and/or equivariant, tensor-based neural network (NN) approach as implemented in DEEPMD, NEQUIP/ALLEGRO codes, respectively, and Moment Tensor Potential (MTP). For the training and validation sets, I employed the ab-initio molecular dynamics (AIMD) trajectory results and ground state DFT calculations, including the energy, force, and virial database from highly diverse compositions, temperatures, and pressures following a “High Entropy Strategy.” The Deep …
Application Of Multi-Scale Computational Techniques To Complex Materials Systems,
2023
University of Kentucky
Application Of Multi-Scale Computational Techniques To Complex Materials Systems, Mujan N. Seif
Theses and Dissertations--Chemical and Materials Engineering
The applications of computational materials science are ever-increasing, connecting fields far beyond traditional subfields in materials science. This dissertation demonstrates the broad scope of multi-scale computational techniques by investigating multiple unrelated complex material systems, namely scandate thermionic cathodes and the metallic foam component of micrometeoroid and orbital debris (MMOD) shielding. Sc-containing "scandate" cathodes have been widely reported to exhibit superior properties compared to previous thermionic cathodes; however, knowledge of their precise operating mechanism remains elusive. Here, quantum mechanical calculations were utilized to map the phase space of stable, highly-faceted and chemically-complex W nanoparticles, accounting for both finite temperature and chemical …
Elastoplastic Quasi-Static And Impact Load Response Of Steel Structure Sub-Assemblage With Cfrp Strips,
2023
Old Dominion University
Elastoplastic Quasi-Static And Impact Load Response Of Steel Structure Sub-Assemblage With Cfrp Strips, Ali Al Aloosi, Zia Razzaq
Civil & Environmental Engineering Faculty Publications
Presented in this paper is the outcome of an experimental investigation of the elastoplastic quasi-static and impact load response of a steel sub-assemblage constructed using a pair of hollow square section members with or without Carbon Fiber Reinforced Polymer (CFRP) strips. The sub-assemblage consists of a long structural member welded to a short member, thus representing a typical combination of a column and a beam on the face of a multi-story steel building frame. The column is subjected to a lateral quasi-static or impact load. Tests are conducted on four separate steel sub-assemblages. The first two tests are conducted with …
การศึกษาการดูดซับไอออนเงินและทองแดงด้วยผงจากใบว่านหางจระเข้,
2023
คณะวิศวกรรมศาสตร์
การศึกษาการดูดซับไอออนเงินและทองแดงด้วยผงจากใบว่านหางจระเข้, พิชญา อัครานุรักษ์กุล
Chulalongkorn University Theses and Dissertations (Chula ETD)
ด้วยสมบัติทางกายภาพของใบว่านหางจระเข้ ที่มีลักษณะเป็นรูพรุน ใบว่านหางจระเข้จึงมีความโดดเด่นและมีโอกาสพัฒนาขึ้นเป็นผงดูดซับสำหรับใช้ในกระบวนการกำจัดโลหะประเภทต่างๆ ในงานวิจัยนี้ได้ทำการศึกษาเกี่ยวกับการกำจัดไอออนเงินและไอออนทองแดงโดยใช้ผงจากใบว่านหางจระเข้ สายพันธ์บาร์บาเดนซิส (Barbadensis) เป็นตัวดูดซับ โดยมีการเตรียมผงด้วยกระบวนการอบให้ใบว่านหางจระเข้แห้งจากนั้นนำไปบดด้วยเครื่องบดละเอียด ตัวแปรการศึกษาประสิทธิภาพการดูดซับประกอบด้วย ปริมาณของตัวดูดซับ (0.2-1.0 กรัม) ค่าความเข้มข้นเริ่มต้นของสารละลายไอออนทองแดงและสารละลายไอออนเงิน (15-50 มิลลิกรัมต่อลิตร) ค่า pH (2-7) รวมทั้งศึกษาไอโซเทอมและแบบจำลองจลนพลศาสตร์ของการดูดซับเพื่อความเข้าใจในกลไกของการดูดซับของผงใบว่านหางจระเข้ ภาพถ่ายจากกล้องจุลทรรศน์อิเล็กตรอนแสดงให้เห็นว่าผงว่านหางจระเข้มีลักษณะเป็นรูพรุนระดับไมโครเมตร ผลการทดสอบการดูดซับโลหะ ได้แสดงให้เห็นว่าผงของใบว่านหางจระเข้ที่เตรียมขึ้น มีประสิทธิภาพในการดูดซับเงินในสารละลายไอออนเงินสูง เงื่อนไขที่เหมาะสมที่สุดในการดูดซับสารละลายไอออนเงินที่ความเข้มข้นเริ่มต้น 20 มิลลิกรัมต่อลิตร คือปริมาณตัวดูดซับ 0.2 กรัม ค่า pH 7 ซึ่งมีประสิทธิภาพการดูดซับถึงร้อยละ 95.6 ส่วนผลการทดสอบการดูดซับโลหะทองแดงความเข้มข้นเริ่มต้น 20 มิลลิกรัมต่อลิตร ที่มีประสิทธิภาพสูงสุดใช้ปริมาณตัวดูดซับ 1.0 กรัม ค่า pH 5 ซึ่งมีประสิทธิภาพการดูดซับร้อยละ 65.7 จลนพลศาสตร์ของการดูดซับทั้งในไอออนโลหะทองแดงและไอออนโลหะเงินอธิบายได้ด้วยสมการ pseudo second-order และลักษณะของการดูดซับที่เกิดขึ้นอยู่บนไอโซเทอมแบบแลงเมียร์ งานวิจัยนี้สามารถสรุปได้ว่า ผงจากใบว่านหางจระเข้มีโอกาสในการต่อยอดการพัฒนาเพื่อนำไปใช้ในการดูดซับโลหะจากสารละลายต่างๆ อาทิ ดูดซับโลหะในน้ำยาล้างบริเวณบ่อชุบเพื่อลดความเข้มข้นของโลหะก่อนปล่อยทิ้ง เป็นต้น
การป้องกันการเกิดออกไซด์ของโลหะดีบุกผสมบิสมัท 1% โดยน้ำหนัก,
2023
คณะวิศวกรรมศาสตร์
การป้องกันการเกิดออกไซด์ของโลหะดีบุกผสมบิสมัท 1% โดยน้ำหนัก, ภควัต พลมณี
Chulalongkorn University Theses and Dissertations (Chula ETD)
การเกิดฟิล์มออกไซด์ในดีบุกผสมบิสมัท 1% โดยน้ำหนักบนแผ่นขัดเงาจากปรากฎการณ์ออกซิเดชัน ทำให้ประสิทธิภาพของผงขัดบนแผ่นขัดเงาลดลง เพื่อให้ทราบถึงอัตราการเกิดออกซิเดชันในสภาวะที่ถูกจำกัดปัจจัยการเกิดฟิล์มออกไซด์คือ ออกซิเจนในรูปแบบต่าง ๆ เช่น ความชื้นในอากาศเป็นต้น จึงได้ทำการหาอัตราการเกิดออกไซด์ที่เกิดขึ้นโดยเทคนิคทางเคมีไฟฟ้า และทำการหาชนิดของฟิล์มที่เกิดขึ้นด้วยเทคนิคโฟโตอิเล็กตรอนสเปกโตสโกปี ปัจจัยที่ส่งผลในการเกิดออกซิเดชันที่ได้ศึกษาในงานวิจัยชิ้นนี้คือ เวลา และสิ่งแวดล้อมที่จำกัดออกซิเจนที่อุณหภูมิห้อง ผลของการทดสอบออกซิเดชันมีดังนี้ ในบรรยากาศปกติความชื้น 28%-35% พบการเกิดออกซิเดชันที่เป็นไปตามกฎของพาราโบลาที่มีสมาการคือ x = 8.7041t0.14 โดยที่ x คือความหนาของฟิล์มและ t คือเวลาที่ใช้ทดสอบออกซิเดชัน ในบรรยากาศแก๊สอาร์กอน, สุญญากาศ, บิวเทน และที่ห่อด้วยพลาสติก ไม่ได้ถูกจำกัดด้วยกฎพาราโบลา และมีแนวโน้มที่ฟิล์มจะมีความหนาน้อยกว่า แต่ต้องการเวลาในการทำการทดสอบมากกว่านี้เพื่อให้ได้ผลและแนวโน้มอัตราที่ชัดเจน ในการวิเคราะห์ผลจากเทคนิคโฟโตอิเล็กตรอนสเปกโตสโกปีในชิ้นงานที่ผ่านการทำออกซิเดชันในสุญญากาศและที่จัดเก็บด้วยการห่อพลาสติก พบว่าทั้งสองชิ้นงานโดยรวมแล้วมีชนิดของฟิล์มออกไซด์เป็นแบบเดียวกัน โดยจะประกอบไปด้วยไอออนของสารประกอบ SnO, SnO2, Sn(OH)2 และ Sn(OH)4 ซึ่งจากผลการทดลอง จะได้แบบจำลองของชั้นฟิล์มออกมาเป็นชั้น ๆ คือ ชั้นที่ 1 เป็นผิวนอกสุดมีออกไซด์ SnO2 และ Sn(OH)4 อยู่เป็นกลุ่มก้อนไม่สม่ำเสมอ (คลัสเตอร์) ชั้นที่ 2 เป็น SnO และ Sn(OH)2 ชั้นที่ 3 เป็น SnO2 และ Sn(OH)4
Investigation Of Microstructurally Dependent Mechanical Properties Of Cold Sprayed Copper Using Correlative Microscopy,
2023
University of North Florida
Investigation Of Microstructurally Dependent Mechanical Properties Of Cold Sprayed Copper Using Correlative Microscopy, Quintin Otto
UNF Graduate Theses and Dissertations
This project employs multi-instrument materials characterization to analyze material made with the “Cold Spray” additive manufacturing process. Cold spray is an emerging additive manufacturing technique with unique benefits resulting from its low temperature adhesion process induced by plastic deformation. Metallic powder collides at high speeds creating three dimensional materials and coatings without the need for melting. Copper cold sprayed specimens were analyzed using a series of imaging techniques to characterize the microstructure at varying levels of detail and magnification. Scanning electron microscopy and electron back scattered diffraction were paired with microhardness testing to generate a correlative comparison between microstructure and …
Investigation Of Oxidation And Corrosion Resistance Of Ni-Based Alloys And Stainless Steels Under Co2 Environments At Elevated Temperatures,
2023
West Virginia University
Investigation Of Oxidation And Corrosion Resistance Of Ni-Based Alloys And Stainless Steels Under Co2 Environments At Elevated Temperatures, Spencer Roy Fultineer
Graduate Theses, Dissertations, and Problem Reports (ETD)
High mechanical strength integrity, high robustness towards oxidation, and high resistance to carburization under CO2 environments at elevated temperatures are usually required for metallic systems that are employed for power generation. INCONEL 625 is a nickel-based superalloy that started development in the 1950s. This material was designed with the distinct purpose of use in high-temperature and high-pressure systems. While various materials possess the physical properties to handle these conditions, the creation of IN625 addresses the need for a material to withstand the highly corrosive properties of these kinds of environments. In order to evaluate the oxidation and corrosion resistance of …
Damage Stability Study Of A 500 Dw Ro-Ro Ferry Vessel,
2022
Departement of Industrial Technology, Vocational School, Universitas Diponegoro, Semarang 50275, Indonesia
Damage Stability Study Of A 500 Dw Ro-Ro Ferry Vessel, Zulfaidah Ariany, Budhi Santoso, Sarwoko Sarwoko, Nauval Abdurrahman Prasetyo
Makara Journal of Technology
The development of the crossing transportation industry is currently increasing in the island areas. The use of Ro-Ro type ferry boats is extremely efficient in moving people, goods, and vehicles. The current research focuses on the damage stability of the 500 DWT Ro-Ro ferry, which aims to meet the needs of the Ro-Ro ferry in the archipelago area. The previously existing initial design of a barge hull with a main size Lpp = 40.15 m, B = 12 m, H = 3.2 m, and T = 2.15 m was used to analyze the damage stability condition further. First, the drawings …
Structural Risk-Based Underwater Inspection (Rbui) As A Cost Reduction Of Field’S End Of Production Life,
2022
University of Indonesia
Structural Risk-Based Underwater Inspection (Rbui) As A Cost Reduction Of Field’S End Of Production Life, Ivan Fitrian Putra, Johny Wahyuadi Soedarsono, Mirza Mahendra, Yuki Haidir, Faisal Dwiyana Purnawarman, Iwan Sukirna, Widi Hernowo
Journal of Materials Exploration and Findings
Mubadala Petroleum operates offshore platforms in a southern Makassar Straits that needs to be periodically inspected. The cost for the inspection is massive due to the high cost of mobilization and demobilization of vessels including crew and equipment. In response of a new approach to reduce cost, a Risk-Based Underwater Inspection (RBUI) methodology is developed. This RBUI purpose is to reduce the inspection interval of the offshore platform, from every 2 years to a longer period[1]. There are existing RBUI methodologies, which are already developed and implemented in other companies[5]. Purpose of this paper is to …
A Constitutive Material Model For Simulating Texture Evolution And Anisotropy Effects In Cold Spray.,
2022
Mississippi State University
A Constitutive Material Model For Simulating Texture Evolution And Anisotropy Effects In Cold Spray., Creston Michael Giles
Theses and Dissertations
Cold spray has seen rapid advancement since its inception and has shown significant potential as a method of additive manufacturing. However, the large plastic deformation and repeated heating/cooling cycles that the material undergoes during the cold spray process can result in gradients in material structure and large residual stresses. The purpose of this study is to extend the existing EMMI material model to include anisotropic material response through the use of orientation distribution functions to predict residual stresses and anisotropy resulting from cold spray and similar additive manufacturing processes. Through the use of a finite element simulation, yield surfaces for …
Platinum-Iridium Alloys In Jewelry,
2022
Nathen Cade Christa
Platinum-Iridium Alloys In Jewelry, Nathen C. Christa, Seth Walker, Dylan Hallman
ME 4133/6133 Mechanical Metallurgy
One of the most widely used metals on the periodic table is Platinum (Pt). The name is derived from the Spanish Platina, meaning “silver.” This malleable, ductile material is widely used in applications due to its unique chemical properties. A couple of these unique properties include a high melting point and good resistance to corrosion or chemical attack. Platinum materials have alloys that are indispensable in the chemical laboratory for electrodes. This allows for material applications in crucibles and dishes to withstand elevated temperatures. Platinum is used primarily in catalytic converters in vehicles converting emissions from the vehicle’s engine into …
