A strain gauge measurement made on the free aluminum surface indicate – McqOptions

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1.	A strain gauge measurement made on the free aluminum surface indicates the principle strains 0.003 and 0.002. What are the principal stresses? (Given that poison’s ratio for aluminum=0.33, young modulus = 70 GPa)
A.	σ1=965 MPa, σ2=235 MPa
B.	σ1=857.8 MPa, σ2=125.86 MPa
C.	σ1=305 MPa, σ2=458 MPa
D.	σ1=287.5 MPa, σ2=233.96 MPa
Answer» E.

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