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Material Property Variation in an Additive Manufacturing Lab

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Conference

2021 ASEE Virtual Annual Conference Content Access

Location

Virtual Conference

Publication Date

July 26, 2021

Start Date

July 26, 2021

End Date

July 19, 2022

Conference Session

Computational Tools & Analysis

Tagged Division

Materials

Page Count

10

Permanent URL

https://peer.asee.org/37486

Download Count

158

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Paper Authors

biography

Charles Pringle PE P.E. Central Washington University

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Charles Pringle is a professor in the Mechanical Engineering Technology program at Central Washington University. Charles teaches upper division courses including the senior capstone course.

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Craig Johnson P.E. Central Washington University Orcid 16x16 orcid.org/0000-0002-7882-9754

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Dr. Johnson is retired with Emeritus status and continues to assist the MET program (Mechanical Engineering Technology Program at Central Washington University - www.cwu.edu/engineering ). He was the ASEE Campus Representative, Mat'ls Div Chair, PNW Section Chair for ASEE. He was also the Foundry Educational Foundation Key Professor, coordinating the Cast Metals Program. He also represented CWU as a technical partner to the MatEdU NSF program (www.materialseducation.org).

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Jeunghwan Choi Central Washington University

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John(Jeunghwan) Choi is a professor in the Mechanical Engineering Technology program at Central Washington University. John teaches upper division courses including the Senior capstone course.

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Abstract

Traditional structural design is typically covered in statics and strengths of materials. New additive manufacturing (AM) techniques allow us to design structures free of prismatic constraints, using ‘freeform’ design that results in better performance. But AM structures also exhibit significant variation in material properties that must be taken into account. Using ‘best practice’ in engineering analyses is a student outcome that is part of our senior design course. One lab was modified in this course to improve student performance on this outcome. Originally the machine design ‘lever’ lab was a theoretical exercise. Several years ago, this was improved to an applied lab. The student design was printed (AM) and then failed. Recently, the machine design ‘lever’ lab was modified to include a transition from prismatic to freeform design through the creation of a simple lever. The lab consists of five sequential activities. The first three are: a traditional prismatic analysis, then a non-prismatic analysis, then an optimization to success criteria analysis, with AM fabrication and test feedback. The last two activities involve applying ‘light-weighting’ techniques and further optimization, with another round of AM fabrication and test feedback. Throughout the lever lab activities, students are evaluated on analysis performance. A part of the new modifications was an evaluation of tolerancing and predictions. Since AM processes have directional and other inputs causing material property variation, this was an aspect of lever performance prediction that was modified and specified for evaluation. Student performance in this outcome improved and is now used as part of our continued assessment.

Pringle, C., & Johnson, C., & Choi, J. (2021, July), Material Property Variation in an Additive Manufacturing Lab Paper presented at 2021 ASEE Virtual Annual Conference Content Access, Virtual Conference. https://peer.asee.org/37486

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