Answer: B. Rhombus
According to St. Venant's theory yield locus is a rhombus.
Solution
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 | Shape |
Maximum principal stress theory (Rankine) | square |
Maximum principal strain theory (St. Venant) | rhombus |
Maximum shear stress theory (Tresca) | hexagon |
Maximum strain energy theory (Haigh) | ellipse |
Maximum distortion energy theory (Von Mises) | ellipse |
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