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Question: definition of stress 10 points there are 4 different metallic...

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(Definition of Stress, 10 points) There are 4 different metallic bars - gold, aluminum, niobium and tungsten. The uni-axial mechanical tests were performed to obtain their strength as shown in Figure below. The force values at the onset of plastic deformation were measured and their cross-sectional area was monitored during mechanical test. Material strength is typically defined as the stress value at which plastic deformation begins. According to the following data in the table, (a) Calculate the strength of these four materials (Use the unit, MPa - 10° Pa) (8 points), and (b) List the name of materials from the strongest to the weakest 2 Points. Force (P) Cross-sectional area (A) Cross-sectional area at the onset of plastic deformation 1 cm 0.5 cm2 I mm 10 μ㎡ Force required for the onset of plastic deformation Material Gold Aluminum Niobiumm Tungsten 2000 N 750 N 80 N 0.002 N

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