Mae20_PracticeFINAL_winter_2007

Mae20_PracticeFINAL_winter_2007 - 1 Name SID MAE 20...

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1 Name: SID: MAE 20, Elements of Materials Science Practice Exam 1. A calculator is allowed 2. The number of points is indicated next to the question Question 1 (6 points) What is the difference between a thermoset and a thermoplastic polymer? Give one example of each. Question 2 (18 points) Justify, briefly, the following statements: (1) Dislocation movement is difficult in ceramics/ionic solids (2) The engineering stress- engineering strain diagram is easier to determine than the true stress-true strain diagram (3) The tensile strength of coarse pearlite is greater than that of fine pearlite
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2 (4) The presence of cracks in a material leads to stress concentration and causes the material to fail at a much lower value than the fracture strength (5) The sharp corners of machined parts must be rounded out to prevent fatigue failure (6) A martensitic structure is very hard and brittle
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3 Question 3 (8 points) Draw a typical, labeled, stress-strain diagram for a metal. Indicate on the diagram, the following quantities: (a)
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