A material which obey’s Hooke’s law is subjected to direct stress σo. At its elastic limit, which of the following statements is true?

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A material which obey’s Hooke’s law is subjected to direct stress σo. At its elastic limit, which of the following statements is true?

a) Strain is equal to σo /E

b) Maximum shear stress = σo /2

c) Strain energy = (σo2/2E) x volume

d) All options are correct  (Ans)