Date of Graduation

Spring 2016

Document Type

Honors Research Project

Degree Name

Bachelor of Science

Major

Mechanical Engineering - Cooperative Education

Research Sponsor

Dr. Erol Sancaktar

First Reader

Dr. Scott Sawyer

Second Reader

None (ME project)

Abstract

The Hopkinson Split Bar test can be used to accurately develop the relationship between the stress and strain a material undergoes during a high speed impact (rates of 1000/s). This information has many industrial uses, for example the auto industry can use this technology to analyze how materials will behave under crash-like circumstances. In this experiment the stress-strain curves were developed for the PC-Plumbing epoxy.

One of the variables that can be adjusted in the Split Hopkinson Bar test is the ration between the height of the sample and the width of the sample (Hs/Ds). This experiment investigated how three different sample sizes (0.25, 0.33, >1) affected the results.

The stress strain curves were found, as well as the maximum strain rates, yield strengths, yield strain and modulus’s of elasticity. The effect of the Hs/Ds also was that each sample size resulted within a distinct range of maximum strain rates.

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