While True stresses calculation based upon the current/decreased cross section area continuous to increase after the Ultimate Tensile Stress value is reached until the fracture occurs, it means the Tangent Modulus (E) does not become negative after the ultimate tensile stress value. To define the non linear portion of the material after yield stresses, Engineering Stress continuous to increase up to the Ultimate Tensile stress and then stress value starts to decrease until the fracture of the material occurs, it means the Tangent Modulus (E) becomes negative after the Ultimate Tensile Stress.
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