Tensile Test Report

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Laboratory Two: Tensile Testing of Three “505” Specimens Lab Group - 1st Mondays, Late: Jesse Bertrand, Ryan Carmichael, Anne Krikorian, Noah Marks, Ann Murray Report by Ryan Carmichael and Anne Krikorian E6 Laboratory Report – Submitted 7 April 2008 Department of Engineering, Swarthmore College Abstract: We determined the elastic modulus, yield strength, tensile strength, modulus of toughnes, elongation, reduction of area, as well as true stress and strain at rupture point for three “505” specimens, one each of SAE 2011-T-3 aluminum, 1081 hot rolled steel, and PVC plastic. We accomplished this by first placing our specimens one at a time into a universal testing machine (UTM), which, under computer control, slowly increased the tension force on each specimen, stretching each until failure. We then analyzed the data output from the computer controlling the UTM to obtain the following results: Yield Stren gth (ksi) Aluminum 9.2+0.1 46.0+ 0.2 Steel 27.6+0.2 82.9+ 0.4 PVC 0.402+0.002 5.478 +0.1 Elastic Modulus (103 ksi) Tensile Strength (ksi) 55.9+0.1 91.2+0.2 7.111+0.05 Modulus of Toughness (in.) 8.945+0.1 14.429+0.1 1.910+0.08 Modulus of Resilience (%) 89.89+0.1 82.43+0.1 22.14+0.8 Elongati on in 2 in. (in.) 0.3120 +0.005 0.3615 +0.005 0.5505 +0.005 Reduction of area (%) 45.74+0.1 58.63+0.1 48.25+0.1 1 Purpose: The purpose of this experiment is to extract data on the material properties of three “505” specimens (SAE 2011-T-3 aluminum, 1081 hot rolled steel, and PVC plastic), using a mechanically driven universal testing machine (UTM). These material properties include the following: the elastic modulus, 0.2% offset yield strength, ultimate tensile strength, modulus of rupture, modulus of resilience, as well as true strain and true stress at the point of rupture. Theory: Certain materials (those that are linear, homogeneous, elastic, and

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