Lab3-Plastic_Deformation - Lab 3: Plastic Deformation...

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Lab 3: Plastic Deformation Mechanics of Deformable Solids Spring 2011 Tension Test In this Lab, students will be given opportunity to conduct tension tests of metallic materials and to analyze the data. Tension test is widely used to provide basic design information on the strength of materials. In the standardized tension test, a specimen is subjected to a continuously increasing uniaxial extension while simultaneously measuring the tensile force applied to the specimen. The ASTM standard (ASTM E8-04) of “standard test methods for tension testing of metallic materials” can be downloaded from ANGEL. A typical relationship between engineering stress and engineering strain obtained from a tensile test is shown in Figure 1. Figure 1. Stress-strain curve of a tensile test The point at which the stress-strain relationship changes from linear to non-linear is known as the yield point . The stress at the yield point is called yield strength of the material. The usual definition of the yield strength is the offset yield strength determined by the stress corresponding to the intersection of the stress-strain curve and a line parallel to the elastic part of the curve offset by a specified strain that is 0.2%. As the applied stress increases beyond the yield point, the material begins to deform plastically and changes its shape permanently. During the plastic deformation, the cross-sectional area of
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Lab3-Plastic_Deformation - Lab 3: Plastic Deformation...

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