EAST Program for STEM Students
2012 SURF: Stress and Material Properties Analyses
Stress Analysis and Material Properties Determined With Various Techniques
Undergraduate Research Fellow: Jacob Finley, Mechanical Engineering
Mentor: Dr. Mehrdaad Ghorashi, Engineering Department
The purpose of these experiments was to determine the material properties and to perform stress analysis of several specimens made of metals and polymers. This activity was mostly successful and was accomplished using different, but related test setups. Qualitative determination of residual stresses in the polymer specimen was accomplished using cross polarized fluorescent light that displayed stress fringe patterns via birefringence.
Using strain gauges attached to flat bars and round tubes made of aluminum 6061 alloy, 304 stainless steel round tube, C1018 cold-rolled steel, and A36 hot-rolled structural steel that were loaded in bending, strain results were obtained. They were then used in corresponding equations to provide the modulus of elasticity and in some cases the Poisson’s ratio of the mentioned materials. The obtained results were then compared against available data for these materials. Additionally, utilizing ASTM E-8 standard, tensile test samples were cut and tested in the Instron 5882 universal testing machine to determine mechanical properties like modulus of elasticity, yield strength, tensile strength, and rupture point. Finally, another test setup was built for demonstrating Maxwell’s Reciprocity theorem.Start Slideshow