Engineering Board Exam Reviewer · Engineering Materials · hard

At an engineering stress of 400 MPa, a specimen has an engineering strain of 0.20. Assuming constant volume, what is the true stress?

  1. 480 MPa
  2. 400 MPa
  3. 333.3 MPa
  4. 72.9 MPa

Answer

A. 480 MPa

Solution

T = (1 + ) = 400(1.2) = 480 MPa. (True strain = (1.2) = 0.1823.)

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