completing lab : Virtual Mechanical Properties of Materials in Tension, engineering homework help

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Name: Date: CVEN207 2017Su Lab 1: Virtual Mechanical Properties of Materials in Tension Directions: Using the VMSE site “Tensile Tests” module run tensile test for the following materials. From the stress vs. strain plot, fill out the data table and answer the questions. 1) Data table based on the VMSE plots & Appendix: Sample E (GPa) σy (.002 offset) εy σuts(MPa) σf (MPa) εf (MPa) temp. steel aluminum carbon steel cast iron HDPE nylon 156460 4575 75281.5 126450 403.22 27160.98 1392.5 292.8 240.9 252.9 5 43.2 0.0089 0.0064 0.0032 0.0002 0.0124 0.0159 1656.6 483.7 273.3 415.5 19.1 87.5 1628.4 474 253 415.5 12.2 44 *Text E *Text σy (GPa) (MPa) 0.1484 0.2236 0.4302 0.0044 6.3367 0.445 Questions: 2) Compare the materials in order from lowest to highest values obtained for: E, σy, σuts, and σf. 3) Using Appendix H & Callister Text, how closely do your values for E & σy match the expected values? Which ones were different? Why might this be? *Report values as a range if possible 4) What is the optimal shape geometry for a tensile specimen? Why? 5) What is necking and when does it occur? Name: Date: CVEN207 2017Su 6) Which material is most ductile? Which is most brittle? Justify your answer. 7) Assuming a poisson’s ratio of 0.3, what would the lateral strain for tempered steel at a stress of 1000 MPa? 8) Repeat the measurement of E and σy 10 times for tempered steel. What is the average and standard deviation? ***Extra Credit: Comment on the meaning of the average and standard deviation derived in (8)— what does this tell you about your results?
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