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Unformatted text preview: ME-313/513 LABORATORY TENSION TESTOBJECTIVE: The objective of these experiments is to determine various mechanical properties of materials using the tension test. THEORY: The tension test is a common engineering test used to determine the strength of materials, and is an acceptance standard for materials. In its simplest form, a specimen of standard dimensions is held between grips and a uniaxial tensile load is applied by moving the grips apart. The deformation of the specimen and the corresponding load are continuously recorded. The ENGINEERING STRESS is a measure of the intensity of applied load, and is defined as the load divided by the starting cross-sectional area of the specimen. AP=The extent of deformation is measured by the ENGINEERING STRAIN defined as the change in length of the specimen divided by its original length. LL=The plot of engineering stress versus engineering strain is called the ENGINEERING STRESS-STRAIN CURVE. It shows many important features of metal deformation behavior. In the initial portion of the stress-strain curve, if the applied load is removed, the specimen returns to its original length. This is called ELASTIC DEFORMATION. Also, in this region, the stress is proportional to the strain. The slope of the elastic portion stress strain curve is a material property called the YOUNG'S MODULUS, or ELASTIC MODULUS....
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- Spring '08