ME 477 Lecture Notes - Lecture 1: Stress (Mechanics), Tensile Testing, Elastic Modulus
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Compression testing requires a higher capacity testing machine because the cross-sectional. Given the k and n values of two different materials, you can estimate which material is tougher. Due date: 9/15 (in class: explain why the difference between engineering strain and true strain becomes larger as strain increases. The difference between engineering strain and true strain becomes larger as strain increases because true strain depends on the instantaneous dimensions of the sample tested. Explain. area increases with the amount of time the test runs for, unlike tensile testing where the cross sectional area gradually decreases as the test goes on. As the cross-sectional area increases, the necessary load also increases. A greater load is needed in compression testing to obtain a similar cross-sectional area as you would in a tensile test: you are given the k and n values of two different materials. To accurately measure which material is harder, you would need the true fracture stress and strain values.
