The design loads of a member made of a brittle material produce the following nonzero stress components at the critical section in the member: σxx = −60 MPa, σyy = 80 MPa, and σxy = 70 MPa. The ultimate strength of the material is 460 MPa. Determine the factor of safety used in the design.
a. Apply the maximum principal stress criterion.
b. Apply the maximum principal strain criterion and use ν = 0.20.
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