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Tensile Comparison of Polymer Specimens Produced with Different Processes

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2018 ASEE Annual Conference & Exposition


Salt Lake City, Utah

Publication Date

June 23, 2018

Start Date

June 23, 2018

End Date

July 27, 2018

Conference Session

MET and Mechatronics

Tagged Division

Engineering Technology

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Paper Authors


Wei Dai Vian Purdue University, West Lafayette

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Dr. Wei Vian is an assistant professor in practice in the program of Mechanical Engineering Technology at Purdue University Statewide Kokomo campus. She got her Ph.D from Purdue Polytechnic, Purdue University, West Lafayette. She got her bachelor and master degree both from Eastern Michigan University. Her recent research interests include grain refinement of aluminum alloys, metal casting design, and innovation in engineering technology education.

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Nancy L. Denton P.E. Purdue University, West Lafayette

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Nancy L. Denton, PE, CVA3, is a professor in Purdue University's School of Engineering Technology, where she serves as associate head for MET. She is on the Vibration Institute’s Board of Directors, chairing the Academic Committee and serving on the Certification Scheme Committee. She is a Fellow of ASEE and a member of ASME.

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The tensile test identifies key mechanical properties of materials, making it a common element in many materials science laboratory classes. In the sophomore-level mechanics course for the mechanical engineering technology (MET) degree program and the introductory materials and processes courses for MET and manufacturing engineering technology (MFET) students at campuses of XXXXX University, tensile testing of dogbone specimens made by a single manufacturing process has been in place for many years. As is, this testing provides an effective means for lower division college students to understand how mechanical properties such as Young’s modulus and ultimate tensile strength are determined. However, the variability in apparent and actual property values that comes from differences in manufacturing processes and dimensional tolerances leads to student confusion and lack of confidence in their experimental results. To help lower division college students understand how these factors affect experimental results, the tensile testing experiment was expanded to incorporate thermoplastic specimens made by three distinctly different processes. Student roles included manufacture of the specimens, measurement of necessary dimensions, conducting the tensile tests, generating stress-strain curves for each specimen, and determining the corresponding Young’s modulus and ultimate tensile strength values. Reflection on the effects of process and geometric variation on their property results became a new report requirement. This article will present the complete laboratory experience, results, and initial student response to this enhanced tensile testing experiment. Keywords: Tensile test, Tensile strength, Specimen preparation, Specimen manufacture

Vian, W. D., & Denton, N. L. (2018, June), Tensile Comparison of Polymer Specimens Produced with Different Processes Paper presented at 2018 ASEE Annual Conference & Exposition , Salt Lake City, Utah. 10.18260/1-2--31072

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