Digital Commons Network^™

Controllable Failure In 3d Printed Carbon Fiber Petg Using Programmable Cooling Conditions, Anna Keim, Monique Mcclain

MMRL-XMO Industrial Seminar

The tensile properties of 3D printed specimens using fused filament fabrication (FFF) are the subject of extensive research. Forced convection from print cooling fans has been shown to have a measurable effect on print quality and tensile performance because the cooling rate of the polymer strongly controls interlayer adhesion. Print fan speeds are typically kept constant throughout a print, but changing the fan cooling throughout a print has the potential to locally tune interlayer strength and therefore, the location of break. This work shows the effect of selectively cooling printed regions, with the goal of repeatably inducing failure in these …

A Semantic Evaluation Approach For Improving The Reliability Of Llm Outputs In Manufacturing, Dongjun Yun, Martin Byung-Guk Jun

MMRL-XMO Industrial Seminar

Large Language Models (LLMs) have recently shown strong performance across various domains, including manufacturing, where they are increasingly used with multi-agent systems for semi-autonomous tasks such as real-time machine monitoring and operator support. However, their reliability remains a concern due to hallucination, where outputs may appear plausible but contain incorrect or inconsistent information. To address this issue, this study proposes a semantic evaluation methodology for assessing the reliability of LLM-generated content in machining  environments. The approach is based on the embedding model BGE-M3 and focuses on capturing semantic consistency between machine observations and LLM-generated operational recommendations by comparing them against …

A Practical Digital Twin Framework For Safe Human-Robot Collaboration In Resilient In-House Manufacturing, Harshkumar K. Parmar, Shivakumar Raman

MMRL-XMO Industrial Seminar

Recent supply-chain disruptions and growing interest in domestic production have renewed attention to in-house manufacturing systems that are flexible, practical, and easier to deploy. Human-robot collaboration (HRC) is a promising option in such settings because it combines human adaptability and judgment with robotic precision and repeatability [1], [2]. Still, broader use of HRC in smaller or resource-constrained manufacturing environments is often limited by safety concerns, coordination challenges, and the cost and complexity of implementation. This paper presents a practical digital twin framework for safe human-robot collaboration in resilient in-house manufacturing. The contribution of the paper is not a generic three-layer …

Convergent Manufacturing Of Metal-Ceramic Architectures For High-Temperature Environments, Sk Shamim Hasan Abir, Joni C. Dhar, Sandipan Mishra, Daniel Lewis, Johnson Samuel

MMRL-XMO Industrial Seminar

High-temperature thermal barrier systems require a graded architecture that transitions from a metallic substrate to a ceramic top coat to mitigate damage caused by mismatches in coefficients of thermal expansion (CTE). This study presents a convergent manufacturing strategy that integrates twisted wire gas tungsten arc (GTA) surfacing with cold sintering (CS), followed by CO₂ laser sintering, to fabricate a robust thermal barrier. High entropy alloy (HEA) bond coats with Al-Cr-Fe-Ni-based compositions were deposited onto Inconel 625 substrates using semi-automatically twisted commercial welding wires (Inconel 625, SS308Lsi, and Al ER4043) via GTA surfacing, resulting in HEA layers predominantly composed of >60 …

Experimental Methods For Characterizing Interfaces In Multi-Material Adhesive Joints, Kevin L. Cloherty, Drupad Kadiyala Bhavani, Dante P. Stigliano, Alexander H. Krueger, Christopher J. Hansen, Amy M. Peterson, Alireza V. Amirkhizi

MMRL-XMO Industrial Seminar

Multi-material systems bonded with adhesives are increasingly used in engineering due to their design flexibility and performance. To fully optimize these systems, it is essential to characterize their interfacial properties accurately. However, standardized methods to characterize interfacial properties under pure stress states, especially in dissimilar material joints, are limited. This study presents a framework using modified poker-chip and hat-shaped specimens to promote dominant normal and shear adhesion behavior in polymer-ceramic systems. Custom fixtures were designed to reduce material use and maintain uniform adhesive thickness during sample preparation. Preliminary results demonstrate dominant mode-specific interfacial properties for various multi-material and adhesive configurations. …

Experimental Investigation Of Thermal States In Polymer–Ceramic Multi-Material Additive Manufacturing, Jagadeesh Reddy Kanuboddu, Amy Peterson, Alireza Amirkhizi, Christopher J. Hansen

MMRL-XMO Industrial Seminar

Polymer–ceramic multi-material additive manufacturing (MMAM) offers opportunities to combine the complementary properties of polymers and ceramics within a single structure. However, integration of these materials remains challenging because ceramic processing temperatures greatly exceed those tolerated by most polymers, creating the risk of melting or thermal degradation during adjacent ceramic processing. This challenge is particularly important when laser-based ceramic processing is performed in proximity to polymer additive manufacturing processes, including applications involving ceramic powder bed fusion. Understanding transient heat transfer from laser-heated ceramic regions to neighbouring polymer structures is therefore important for the development of practical polymer–ceramic MMAM approaches. Previous thermal …

Thermal Analysis And Fabrication Of Polyelectrolyte-Ceramic Composites, Rajeswari Das, Amy M. Peterson, Christopher Hansen, Alireza Amirkhizi

MMRL-XMO Industrial Seminar

Polyelectrolyte complexes (PECs) are a versatile class of macromolecular assemblies that are formed by mixing two oppositely charged polyelectrolyte solutions. Because of their tunable properties, PECs have attracted significant interest for applications in tissue engineering scaffolds, drug delivery systems and underwater adhesives. In this study, PECs were formed by combining a strong polycation (poly(diallyldimethylammonium chloride), PDADMAC) with a strong polyanion (poly(sodium 4-styrenesulfonate), PSS) and were further reinforced with alumina to produce composite materials. The effects of salt concentration and ceramic filler incorporation were investigated as the primary experimental variables. Alumina was chosen as the reinforcing phase because of its established …

Photopolymerization-Based Additive Manufacturing Of Glass Microsphere-Filled Composites, Nzube Udegbunam, Amy Peterson, Christopher Hansen, Pauline Smith, Alireza Amirkhizi, Ian Mcaninch

MMRL-XMO Industrial Seminar

Composite systems offer significant advantages in tailoring mechanical properties across a component; however, the influence of additive manufacturing techniques on the microstructure, cure behavior, and performance of such materials remains insufficiently understood, particularly for photocurable polymer composites. This study investigates the fabrication and characterization of polymer composites reinforced with glass microspheres using two additive manufacturing techniques, specifically UV-assisted Direct Ink Writing (DIW) and Digital Light Processing (DLP). Interestingly, we observe large differences in tensile properties between DLP specimens fabricated using different printers, indicating that individual printer design is an important consideration. We also demonstrate that the same polymer feedstock can …

Convergent Manufacturing Of Smart Metallic Structures, Jinhan Ren, Shinan Huang, Sazedur Rahman, Fotis Kopsaftopoulos, Johnson Samuel, Semih Akin

MMRL-XMO Industrial Seminar

Smart Metallic Structures (SMS) featuring embedded sensing capabilities have gained significant attention for mission-critical applications. Despite the growing importance of this emerging field, achieving reliable and efficient fabrication of SMS remains a challenge. This study presents a convergent manufacturing pathway for producing smart structures with integrated sensing capabilities. By leveraging Wire-Arc Additive Manufacturing (WAAM) as the primary additive process and combining it with complementary subtractive machining, sensor embedding, and metallization techniques, the developed approach enables the fabrication of multifunctional metallic components tailored for advanced structural monitoring SHM). To demonstrate this concept, a structural beam made of Al-5356 was designed to …

Active Cooling Of Polymer-Ceramic Interfaces In Multi-Material Additive Manufacturing, Olorunfemi J. Esan, Christopher Hansen, Alireza Amirkhizi, Ian M. Mcaninch, Stephen R. Cluff, Pauline M. Smith, Amy Peterson

MMRL-XMO Industrial Seminar

Multi-material additive manufacturing (MMAM) enables the fabrication of components with tailored properties and functionalities. However, integrating dissimilar materials such as polymers and ceramics remains challenging due to their widely differing processing temperatures. In this work, we modeled the integrated processing of polymer-ceramic systems and investigated active cooling strategies to preserve the polymeric component. The modeled MMAM approach consists of laser fusion (not necessarily powder bed) of both the polymer and the ceramic. A physical gap was designed between the two materials, and nitrogen gas flow at pressures ranging from 0.5 to 2 psi was introduced into the gap. The results …

Robust And Accurate Pose Estimation For In-Space Robotic Manufacturing Under Challenging Lighting Conditions, Abhay Negi, Rudranarayan Mukherjee, Satyandra K. Gupta

MMRL-XMO Industrial Seminar

Visual 6D object pose estimation is a critical capability in modern robotics and computer vision. This is most commonly achieved by exploiting an object's identifiable features and known geometry. While classical computer vision algorithms  perform reliably under controlled conditions, they are sensitive to common real-world degradations such as occlusion and adverse illumination. This paper presents a framework for robust and accurate pose estimation that combines deep learning and classical algorithms. Our approach features a U-Net-based segmentation model and a MobileNetV3-based keypoint regression network, both trained entirely on synthetic data with extensive domain randomization. An iterative PnP refinement further enhances accuracy …

Low-Cost Agile Tooling For Stamping Metallic And Composite Sheets Using A Hybrid 3d-Printed Composite Shell And A Core, Alireza Zarei, Koorosh Delavari, Mostafa Elnaggar, Madhura Athale, Taejoon Park, Farhang Pourboghrat, Srikanth Pilla

MMRL-XMO Industrial Seminar

Conventional sheet metal and composite stamping depends on machined steel dies that are expensive and slow to produce, limiting their practicality for prototyping and low-volume manufacturing. This study presents a low-cost agile tooling (LCAT) strategy that integrates a 3D-printed polymer composite shell with a concrete core. Tool shells were fabricated using FDM method with polyamide 12 thermoplastic filament reinforced with 35 wt% chopped carbon fiber. The workflow included 3D printing, machining test coupons, mechanical characterization, constitutive model development, finite element simulation, and stamping trials. Results show that the new composite tool design offers better performance and lower cost than fully …

Biodata Analysis Group (Formerly Bioinformatics Core), Bartek Rajwa, Purdue University Office Of Research

University Research Core Facility Boilerplate Descriptions

No abstract provided.

Purdue University General Institutional Description, Purdue University Office Of Research

University General Facility Boilerplate Descriptions

Overview of Purdue University mission, statistics, and key cross-campus infrastructure.

Vertical Alignment As A Systemic Strategy For Sustaining Workforce-Aligned K–12 Engineering Initiatives: A Collective Case Study Of District-Wide Microelectronics Integration, Greg J. Strimel, Victoria Constantine, Deana Lucas, Emily Haluschak, Yubin Lee, Morgan Hynes, Selcen Guzey, Tamara J. Moore

School of Engineering Technology Faculty Publications

Background

In response to the 2022 CHIPS and Science Act, a K–12 workforce development initiative was launched to embed microelectronics education across US school districts. To promote sustainability, the initiative employed a district-wide vertical alignment strategy that progressively integrates microelectronics content and engineering-related career experiences from kindergarten through high school. While vertical alignment is often used for curriculum planning, its broader potential as a systems-level strategy remains underexplored.

Purpose

This study investigated how vertical alignment functions within a K–12 engineering workforce development initiative, focusing on enablers/barriers toward expanding and sustaining integration efforts. The research questions addressed stakeholder experiences with the …

Transmogrifying Coding Into A Social Studies Technology Tool: Using Participatory Design With Engineers And Social Studies Educators To Design Data Visualization Tools For Social Studies Data Literacy Education, Bahare Naimipour, Jessica Zhang, Tamara Shreiner, Mark Guzdial

Journal of Pre-College Engineering Education Research (J-PEER)

Our work aims to inform, design, and create data visualization tools that are meant to be integrated specifically into social studies classes. In this essay we discuss the use of participatory design methods to learn what social studies teachers (both pre-service and in-service) want in their classrooms and test the usability of real tools with these participants. Through this approach we iteratively engage our users, and they inform the design and development of learning tools for the learning and instruction of social studies data literacy. Using a social construction of technology lens, we describe the scaffolding embedded in our tools …

Understanding Transgender And Gender-Nonconforming Students’ Experiences In Precollege Engineering Education: A Latent Profile Analysis, Jialing Wu, Medha Dalal, Rachel Figard, Adam R. Carberry

Journal of Pre-College Engineering Education Research (J-PEER)

Promoting gender equity and inclusion in STEM education remains a central priority, yet empirical research inclusive of transgender and gendernonconforming (TGNC) students is limited, particularly in precollege engineering contexts. This study leverages social cognitive career theory (SCCT) to identify latent profiles of students’ engineering-related beliefs while examining how TGNC students are represented across these profiles relative to their cisgender and gender nonreporting peers. The study draws on four years (2019–2023) of repeated cross-sectional survey data from a national precollege engineering initiative involving 75 high schools across 20 US states. Seven SCCT-related constructs were measured and used as part of latent …

Applied Research In Field Crop Pathology For Indiana, 2019, Darcy E. P. Telenko

Purdue University Press Books

Applied Research in Field Crop Pathology for Indiana, 2019 serves as a summary of the applied field crop pathology research trials conducted in 2019 under the direction of the Purdue Field Crop Pathology program in the Department of Botany and Plant Pathology at Purdue University. In Indiana, there are more than 57,600 farms, 16,000 crop producers, and 900 certified crop advisers, Extension educators, and crop-protection industry representatives who manage more than 11.4 million crop-production acres with a total value of $6.3 billion annually. There are more than twenty diseases affecting corn, soybeans, and wheat that may decrease crop production and …

Aquaponics: Farming Fish And Growing Greens For Grades 9–12, Amy M. Shambach,, Rebecca M. Ward, J. Stuart Carlton, Kwamena K. Quagrainie, Tomas O. Höök

Purdue University Press Books

Aquaponics: Farming Fish and Growing Greens for Grades 9–12 teaches STEM-related course material through aquaponics, a water-based agricultural system that combines aquaculture (fish production) and hydroponics (soilless vegetable production) systems. This curriculum is aligned with Next Generation Science Standards and designed to be used with an onsite aquaponics system. Topics include an introduction to aquaculture, fundamental parts of an aquaponics system, the nitrogen cycle, water quality, population dynamics, our modern food system, and more. The ten lessons presented build on each other and are intended to be delivered in sequential order. Alternatively, lessons may also be utilized as stand-alone units …

After A Fire: Considerations For Residential Property Soil Testing And Restoration, Andrew J. Whelton, Todd Thalhamer, Yiming Liu, Sarah Miller, Hua Cai

Resilience to Emergencies and Disasters

No abstract provided.

Examining Data Richness In Undergraduate Students’ Reflections: A Linguistic Analysis Of Three Data Collection Methods, Kirsten A. Davis, Anne Wrobetz

School of Engineering Education Faculty Publications

Researchers select data collection methods for a variety of reasons. In our research on experiential education programs, we perceived that when we collected students’ reflections using different methods, the data we received was different. However, we found few existing studies to help us characterize what was different across our data sets to inform our decisions about which methods to use. Thus, the purpose of our study was to compare data richness across three data sets from previous studies of engineering students studying abroad, each collected using a different method (written diaries, interviews, video diaries). We used linguistic inquiry as a …

A Century Of Safer Skies: Statistical Insights Into Aviation Accidents And Death Rates, Abhijeet Regmi

Journal of Aviation Technology and Engineering

The purpose of this study is to determine whether the recent advancements in the technology used for aircraft maintenance and repair have resulted in an increase or decrease in the accident and fatality rates of aviation incidents and accidents. The primary concerns are the extremely low survival rates in aviation accidents and the necessity to determine whether or not the accident and fatality rates are declining in light of recent technological advancements. If the rate is rising, we must prioritize passenger and crew safety more and adhere to tight regulations when performing repairs and maintenance. The data were compared for …

Aspirational Mirrors: A Conceptual Model Of Alumni-Led Near-Peer Outreach For Precollege Engagement In Ocean Engineering, Habibi Palippui, Juswan Sade

Journal of Pre-College Engineering Education Research (J-PEER)

Precollege students in Indonesia, especially in rural and coastal regions, often lack exposure to engineering disciplines due to social, geographic, and informational barriers. This essay proposes a conceptual model of alumni-led near-peer outreach as an affective and culturally grounded mechanism to engage high school students in ocean engineering. Drawing from theories of social similarity, possible selves, and engineering identity, the model conceptualizes alumni as “aspirational mirrors” who influence students not merely through information but also through identification. The model outlines four primary mechanisms—social connection, narrative engagement, aspirational mirroring, and early identity activation—and also accounts for contextual variables such as school …

Mathematical Modeling And Simulation Of Wheel Hub Stresses Using Finite Element Analysis In Light Military Trainer Aircraft, Alysson Sousa Rabelo, José Aécio Gomes De Sousa, Feliciano José Ricardo Cangue, Luiz Leroy Thomé Vaughan

Journal of Aviation Technology and Engineering

The landing gear of modern aircraft accounts for approximately 20% of the structural weight and 5% of the total weight. Among its components, the wheel hub endures particularly high loads during landing, often leading to cracks and porosity associated with casting-induced micro-voids in magnesium and aluminum alloys. Over time, cyclic stresses enlarge these voids, converting them into critical stress concentrators. Differences in alloy properties, such as yield strength, fracture toughness, and corrosion resistance, further influence how cracks propagate, underscoring the importance of rigorous manufacturing methods and regular nondestructive inspections. To investigate these vulnerabilities, stress analyses were performed on a military …

Urban Resilience Indicators Suitable For Vietnam's Cities To Respond To Climate Change - Towards Urban Sustainable Development, Hoa Quynh Ta

CIB Conferences

Urban areas are increasingly exposed to pressures from rapid urbanization, climate change, and natural hazards, making urban resilience essential for sustainable development. In Vietnam, rapid urban expansion has been accompanied by intensified climate-related disasters, posing significant challenges to urban environments and livelihoods of their inhabitants. As one of the countries most vulnerable to climate change, Vietnam has implemented various policies and programs to promote sustainable urban development and climate change adaptation. Resilience-based approaches are widely used to assess the impacts of climate change. In Vietnam, several frameworks have been developed with international support; however, their applicability to domestic urban planning …

Enhancement Of Compressive Arch Action In Thick Precast And Post-Tensioned Primary Beam Under A Middle Column Removal Scenario, Manh Ha Tran

CIB Conferences

Previous studies have shown that compressive arch action (CAA) is a key load-resisting mechanism in beam–column sub-assemblages subjected to column removal, while current design practice commonly relies on flexural capacity based on plastic theory. This paper presents a comparative study of CAA and flexural capacity for five two-dimensional precast and post-tensioned concrete beam–column sub-assemblages tested under a middle column removal scenario. Flexural capacity is determined based on plastic theory of fully fixed double-span beams. The results show that the ultimate flexural capacity of prestressed specimens is significantly lower than that of the non-prestressed specimen, despite all specimens being designed to …

Advancing Health And Safety Performance On A Large-Scale Infrastructure Water Purification Plant Project, Rajandree Mandy Malindi, John Julian Smallwood

CIB Conferences

The Zuikerbosch System 5A Water Purification Plant, launched in August 2025, as Africa’s largest state of the art water purification facility, recorded the achievement as the developer’s first ‘construction work permit’ project completed with zero fatalities. This large-scale project valued at R4.8 billion and designed to deliver 600 Mℓ/day of potable water, included extensive stakeholder participation, multiple contractors, and client appointed construction project managers, designers, quantity surveyors, health and safety (H&S) professionals and asset engineers across diverse disciplines in a highly complex project environment. The paper reviews literature pertaining to project stakeholder H&S involvement in the six project stages. It …

Health And Safety-Led Structural Decision-Making In Urban Regeneration: A Case Study Of A Former Night Club Redevelopment In Northampton, Uk, David Oloke

CIB Conferences

Urban regeneration projects in constrained town-centre sites present complex challenges where health and safety (H&S), buildability, cost, and programme must be balanced alongside planning and housing delivery objectives. This paper examines the regeneration of a former night club site in Northampton, UK, which has secured planning permission for a new three-storey residential development comprising 19 flats to address identified local housing needs. The study uses an exploratory case study approach based on planning documents, design review evidence, indicative cost/ programme comparison and H&S criteria. This aided the selection of the adopted structural solution—namely a steel frame with precast concrete floors …

Iso 45003/45001 Integration For Psychosocial And Physical Risk Management In Construction: Worker Safety And Workplace Sustainability, Augusta Nkem

CIB Conferences

Purpose: This study examines how psychosocial risk management, guided by ISO 45003, can be effectively integrated within ISO 45001 construction safety management systems to address both psychological and physical dimensions of workplace risk.

Design/methodology/approach: A qualitative thematic synthesis of peer-reviewed literature was conducted, drawing on recent studies, standards, and industry guidance to identify relationships between psychosocial and physical risks, safety climate, and occupational health and safety management systems. The approach follows an integrative review logic to support conceptual development rather than empirical testing.

Findings: The analysis identified three key themes: (1) psychosocial–physical risk interactions operating through cognitive and behavioural mechanisms …

Evaluating Ergonomics Integration In Safety Curriculum Of Civil Engineering Programs In India, Vigneshkumar Chellappa

CIB Conferences

Work-related musculoskeletal disorders (MSDs) represent a persistent and significant challenge within the construction industry, contributing substantially to non-fatal injuries and long-term health issues among workers. Addressing this concern requires a workforce equipped with a robust understanding of ergonomics to implement effective MSD prevention strategies. However, the degree to which ergonomics principles are incorporated into the safety education curricula of civil engineering programs in India remains largely unexplored. This study evaluates the current integration of ergonomics into the safety curriculum of master-level civil engineering programs to identify gaps and opportunities for improvement. A comprehensive curriculum review was conducted across six ranked …