Improving Materials Selection in a Mechanical Engineering Capstone Course
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Improving Materials Selection in a Mechanical Engineering Capstone Course
Bridget M. Smyser1 1 Department of Mechanical and Industrial Engineering, Northeastern University, Boston, MA 02115, U.S.A
ABSTRACT The Capstone Design course in the Department of Mechanical Engineering at Northeastern University requires students to build a physical prototype by the end of the two semester sequence. Although students have long been required to take an introductory materials science course as part of their curriculum, there was concern that materials selection was a weakness in the design process. Beginning in Fall 2011, the CES Edupack materials selection software was introduced into the Capstone Design class. The current work means to investigate: 1) how to assess designs for effective materials selection 2) whether the new software was actually used by the student teams and 3) whether there was evidence of improved materials selection in the projects that occurred after the new software was introduced. Final capstone design reports from 10 previous terms were examined to look for evidence of systematic materials selection procedures and clear discussion of materials properties as the basis for selecting a material. References to the software were also noted. Results show that 24% of the groups used the CES Edupack software in the first three terms that the software was available. In addition, there was an increase in the number of groups that used a systematic selection process based on research into published materials properties rather than choosing materials based on rough experimentation or convenience. Finally, there has been an increase in the number of projects which consider or incorporate composites, high temperature alloys, and advanced polymers as the software has increased awareness of these options. INTRODUCTION Capstone design experiences are an important part of many engineering programs.[1] Although these courses can vary widely, they commonly have the goal of providing senior students with an opportunity to integrate their undergraduate experience and apply their skills to a multifaceted open-ended problem. In mechanical engineering design projects, students need to choose materials for their prototypes, but often a typical mechanical engineering curriculum has a limited number of required materials courses. Unless a department has a materials science minor, materials courses may be limited to an introductory course, and perhaps a course in strength and mechanical behavior of materials. Despite this, materials selection is an important part of mechanical design, because optimized designs can only occur if the materials to construct the final device out of are considered early in the process.
In traditional mechanical design, the palette of materials used by students can be somewhat limited. Alloys of aluminum and steel can be used with few penalties in terms of performance, even if the design is not optimized for materials selection. Purely mechanical prototypes are often made out of common alloys, and
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