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The proposed approach for determining combined stresses of a component

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Conference

2017 ASEE Annual Conference & Exposition

Location

Columbus, Ohio

Publication Date

June 24, 2017

Start Date

June 24, 2017

End Date

June 28, 2017

Conference Session

Teaching Statics, Dynamics, and Mechanics of Materials

Tagged Division

Mechanics

Tagged Topic

Diversity

Page Count

12

Permanent URL

https://peer.asee.org/28994

Download Count

974

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Paper Authors

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Xiaobin Le P.E. Wentworth Institute of Technology

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Professor, Ph.D, PE., Department of Mechanical Engineering and Technology, Wentworth Institute of Technology, Boston, MA 02115, Phone: 617-989-4223, Email: Lex@wit.edu, Specialization in Computer Aided Design, Mechanical Design, Finite Element Analysis, Fatigue Design and Solid Mechanics

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Anthony William Duva P.E. Wentworth Institute of Technology

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Anthony W. Duva
An Associate Professor in the Mechanical Engineering and Technology Department at Wentworth Institute of Technology since 2001 with 14 years of prior full time industrial experience. He has worked in the design of various technologies from advanced underwater and ultrahigh altitude propulsion systems to automated manufacturing equipment. His interests include advanced thermal and mechanical system design for green power generation.

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John Voccio Wentworth Institute of Technology

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Assistant Professor, Ph.D, Department of Mechanical Engineering and Technology, Wentworth Institute of Technology, Boston, MA 02115, Phone: 617-989-4258, Email: voccioj@wit.edu, Specialization in Mechanical Design, Finite Element Analysis and Superconducting Magnets

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Richard L Roberts Wentworth Institute of Technology

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Associate Professor, Department of Mechanical Engineering and Technology,
College of Engineering and Technology,
Wentworth Institute of Technology, 550 Huntington Ave.,
Boston, MA 02115

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Ali Reza Moazed Wentworth Institute of Technology

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Ali R. Moazed is a Professor in the Mechanical Engineering and Technology department at Wentworth Institute of Technology. In addition to over thirty years of industrial and consulting experience, he has taught mechanical engineering courses full or part-time prior to joining Wentworth in 2001. At Wentworth, he teaches design related courses in the solid mechanics area. He believes in teaching from the perspective of a practicing academician by bringing into the classroom topics related to the practice of engineering, along with the latest pedagogical tools.

His expertise is in the area of Applied Finite Element Analysis (FEA) and as an engineering consultant, he provides FEA services to the Utility, Industrial, and Commercial clients nationwide. These services include design analysis, design verification, design modification, design optimization, and failure analysis. He is a registered professional engineer in states of Massachusetts and California.

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Abstract

For a mechanical engineering program, one of the main learning outcomes is that students can design mechanical system components. Achieving this outcome requires students be trained to calculate the combined stresses of a component with multiple loadings by using typical theoretical formulas. We have found, however, that students had difficulty in effectively calculating these combined stresses. We believe that this was mainly due to some misconceptions regarding combined stress. During the last several years, we proposed and gradually modified an approach which facilitated students to calculate stress under combined loading. The proposed approach contains 7 steps which clearly demonstrate the relationships between the forces and the induced stresses. The process guides students in the calculation of stress components due to each individual internal resultant force and how to correctly combine these stresses to form the state of stress at the point under the consideration. This paper will describe the proposed procedure with results of the implementation of the procedure in our teaching. The effectiveness of the proposed approach was evaluated using different classes performance on the combined stress problem in the midterm exam. In two class sections, we explained and implemented the proposed approach with three examples. In another two class sections, we just used the traditional approach; that is, we followed the topics arranged in the textbook for calculating the combined stress. The comparison of the grades on the combined stress problem indicated that the exam average score in the sections with the implementation of the proposed procedure was statistically significantly higher than the exam average score in the sections without the implementation of the procedure. A survey was conducted in the classes regarding the proposed procedure. The feedback information from the survey was very positive. This paper will also present these results of the data analysis of the student survey.

Le, X., & Duva, A. W., & Voccio, J., & Roberts, R. L., & Moazed, A. R. (2017, June), The proposed approach for determining combined stresses of a component Paper presented at 2017 ASEE Annual Conference & Exposition, Columbus, Ohio. https://peer.asee.org/28994

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