Manufacturing Processes I · Metal Forming · 2 marks · Multiple choice
Plastic deformation begins in plane stress at principal stresses 200 and 100 MPa. Under von Mises yielding, find uniaxial tensile yield strength (one decimal MPa).
Plane stress sets the third principal stress to zero. The equivalent stress is $\sqrt{\sigma_1^2+\sigma_2^2-\sigma_1\sigma_2}=\sqrt{200^2+100^2-200(100)}=173.205$ MPa. At yield this equals the uniaxial yield strength. **173.2 MPa, A**.
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