Problem 3-19/3-20/3-21/ Engineering Mechanics Materials.

Engineering Mechanics problem with solution.
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3–19. The stress–strain diagram for a bone is shown, and can be described by the equation P = 0.45110-6
/2 s +
/0.36110-122 s3, where s is in kPa. Determine the yield strength assuming a 0.3% offset.

3–20. The stress–strain diagram for a bone is shown and can be described by the equation
P = 0.45110-6
/2 s +0.36110-122 s3, where s is in kPa. Determine the modulus of toughness and the amount of elongation of a 200-mm-long region just before it fractures if failure occurs at P = 0.12 mm/mm.

3–21. The two bars are made of polystyrene, which has the stress–strain diagram shown. If the cross-sectional area of bar AB is 1.5 in 2 and BC is 4 in 2, determine the largest force
P that can be supported before any member ruptures. Assume that buckling does not occur.