Asee peer logo

Synthesis of a Correcting Equation for 3 Point Bending Test Data

Download Paper |

Conference

2020 ASEE North Central Section conference

Location

Morgantown, West Virginia

Publication Date

March 27, 2020

Start Date

March 27, 2020

End Date

May 20, 2020

Page Count

16

Permanent URL

https://peer.asee.org/35746

Download Count

1409

Request a correction

Paper Authors

biography

Jacob Allen Poremski Geneva College

visit author page

Jacob A. Poremski is currently an undergraduate student at Geneva College. He is a senior pursuing a Bachelor of Science in Engineering (Concentration in Mechanical Engineering) and a Bachelor of Science in Applied Mathematics. He has worked as an Apprentice Product Engineering Intern at Kennametal INC during the summers of 2018 and 2019.

I am interested in the mechanics side of mechanical engineering. More specifically, I seek to pursue a career that deals with the design, optimization, and analysis of products. My professional development at Kennametal over the past two summers has focused on analyzing both the static and fatigue properties associated with products during operation. Verification of results and generating technical analysis reports followed all completed analyses. Currently, I am working on a senior design project focused on the design and analysis of robotic end of arm tooling to help Kennametal automate a specific pick and place process in a manufacturing facility. I seek to attend graduate school to obtain a Master of Science in Mechanical Engineering part time while working full time as a Mechanical Engineer.

visit author page

biography

Christopher Charles Jobes P.E. Geneva College Orcid 16x16 orcid.org/0000-0002-9667-8048

visit author page

Dr. Jobes is a Professor of Mechanical Engineering at Geneva College in Beaver Falls, Pennsylvania, a Professional Engineer certified in Pennsylvania with his own consulting company, and is a Research Engineer for the National Institute for Occupational Safety and Health (NIOSH) Pittsburgh Research Center. He worked for the U. S. Bureau of Mines in control and navigation of a computer-assisted mining machine from 1987 through 1997 earning his Professional Engineering certification from Pennsylvania in 1989. Dr. Jobes has since been working for NIOSH in Mining Equipment Safety, Jolting and Jarring Abatement in Mining Machinery, underground refuge alternatives, and Interventions to Enhance Continuous Miner Operator Safety developing Proximity Detection technology. He is currently a Research Engineer studying EMI and performing FMEA analyses for underground coal equipment. Dr. Jobes has been teaching in Geneva College's Engineering Department since 2007 and has been a full-time professor since 2015. His areas of interest lie in Engineering Mechanics, Machine Component Design, FInite Element Analysis, Kinematics, Robotics, Digital Systems Design, Mechanical Vibrations and Control Theory.

visit author page

Download Paper |

Abstract

Abstract

A frequent requirement of a Mechanics of Deformable Bodies course is for students to complete an experiment using a compression/tension test fixture incorporating a 3-point flexure fixture. The prominent goals of such an assignment are to understand the basic concepts of load/deflection relationships for pure bending situations, to calculate and correlate theoretical analysis with experimental results, and to use computer software to plot and analyze data. Once completed, students should be able to compare theoretical and experimental modulus of elasticity values. The student should then be able to not only determine the type of material used in the 3-point bending test but also discuss any discrepancies between theoretical and experimental values.

During the preparation of lab materials for such an experiment, it was noticed that the data collected from the instrument produced incorrect modulus of elasticity values for all specimens. Extension values suggested that there was more deflection occurring in the test specimen than predicted resulting in modulus of elasticity values lower than expected. In fact, the modulus of elasticity values could be so low that a student could not correctly determine the material type of the specimen being analyzed. In order to correct the extension data, a system deflection analysis was initiated.

First, internal displacements occurring within the 3-point flexure fixture members were determined by calculating the deflections produced during experimental loading. Next, the remaining sources of internal displacements within the system were investigated with the results being fitted to a curve. A correction equation with support separation distance, applied load, and specimen weight as independent variables was generated by summing all the internal displacements found. The original extension data could then be adjusted by subtracting this correction displacement. The resulting correction equation was validated using specimens with a known modulus of elasticity. Successful completion of this project allows students to appropriately correct the 3-point bending extension data collected during an experiment and more accurately calculate an unknown specimen's modulus of elasticity.

Poremski, J. A., & Jobes, C. C. (2020, March), Synthesis of a Correcting Equation for 3 Point Bending Test Data Paper presented at 2020 ASEE North Central Section conference, Morgantown, West Virginia. https://peer.asee.org/35746

ASEE holds the copyright on this document. It may be read by the public free of charge. Authors may archive their work on personal websites or in institutional repositories with the following citation: © 2020 American Society for Engineering Education. Other scholars may excerpt or quote from these materials with the same citation. When excerpting or quoting from Conference Proceedings, authors should, in addition to noting the ASEE copyright, list all the original authors and their institutions and name the host city of the conference. - Last updated April 1, 2015