June 14, 2015
June 14, 2015
June 17, 2015
26.1619.1 - 26.1619.13
Understanding additive manufacturing part performance through modeling and laboratory experimentsAdditive manufacturing (AM) has attracted extensive attention in recent years. Earlier AMtechnologies were considered as a means for rapid prototyping. With advances in machine designand processing technology, various AM machines claim to have the capability of producingfunctional parts that can meet certain performance requirements. As most of the AM parts arebuilt layer by layer, it is clear that parts manufactured from AM processes would performdifferently compared to parts manufactured from conventional processes such as casting andinjection molding. As students often rely on AM for part fabrication in course and capstoneprojects, and industries could adopt AM to produce components for their products, there is aneed for students to understand the performance of parts manufactured from AM processes.The Strength of Materials course is a critical part of a typical engineering and engineeringtechnology curriculm where students acquire basic knowledge and analytical skills formechanical design. With a focus on experiential learning, the Strength of Material course in______ program at ______ University consists of hands-on labortary exercises. Students areorganized in teams to install strain gages and conduct experiments to enhance their learning ofabstract concepts. To introduce students to the mechanical behavior of AM parts, it is appropriateto incorporate an AM laboratory exercise in the course.This paper presents an effort of developing and implementing laboratory materials for students toconduct experiments with AM parts. Fused deposition modeling (FDM) is one of the mostpopular AM technologies. In the FDM process, partially melted filament is extruded from anozzle. The motion of the nozzle is controlled to deposit the material strand by strand and layerby layer. As such, the parts built/printed using FDM is highly anisotropic. In this developmenteffort, tensile specimens of Acrylonitrile Butadiene Styrene (ABS) are printed from threedifferent build configurations. In the first lab, students are assigned to characterize the tensilebehavior of the specimens. The test results are then compared to the bulk ABS property. In thefollow-up lab, the constitutive model of AM ABS, adopted from a graduate research project, ispresented to students. New parts including a beam and an L bracket are fabricated using theFDM process. The beam and the bracket are then tested under three-point-bending and combinedbending and torsion, respectively. Students are instructed to compare the performance of the AMparts to that of the parts with bulk ABS property. Student feedback of the learning experience issummarized. The laboratory exercise can enhance students’ understanding of AM partperformance. The developed materials can be adopted by others teaching in engineeringtechnology programs..
Zhang, Y., & Wang, J., & Mamadapur, M. S. (2015, June), Understanding Additive Manufacturing Part Performance Through Modeling and Laboratory Experiments Paper presented at 2015 ASEE Annual Conference & Exposition, Seattle, Washington. 10.18260/p.24955
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