Homework Answers
1. a. Yield strength = Force /Area
280 N/mm2 = 60000/(22/28 d^2)
Diameter, d = 16.51 mm = 1.651 cm
2. Total strain = Total Stress/E
Total strain = 490/(7 x 10^4) = 0.007
3. Final length after load is released, Lf = Li + DL
DL = Li x Total Strain = 1.5m x 0.007 = 0.0105m
Lf= 1.5 + 0.0105 = 1.5105 m
4. Maximum elastic strain, MES = Elastic stress/ Youngs Modulus(E) = [60000/((3.142/4)*(16.51^2))]/ (7 x 10^4)
MES= 0.004
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