Answer: B. Rhombus
According to St. Venant's theory yield locus is a rhombus.
St. Venant’s theory is also known as the maximum principal strain theory. The theory is based on the premise that inelastic behaviour or failure is controlled by a maximum normal strain. According to St. Venant’s theory yield locus is a rhombus.
Theory of Failure
Maximum principal stress theory (Rankine)
Maximum principal strain theory (St. Venant)
Maximum shear stress theory (Tresca)
Maximum strain energy theory (Haigh)
Maximum distortion energy theory (Von Mises)
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