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If the principal stresses at a point in an elastic material are 2f tensile, f tensile, and 1/2 f compressive, the value of f

If the principal stresses at a point in an elastic material are 2f tensile, f tensile, and 1/2 f compressive, the value of f at failure according to shear strain energy theory, if yield strength of material is 151MPa is (a) 49 MPa (b) 63 MPa (c) 87 MPa (d) 92 MPa

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