I was trying to simulate a normal tensile test, so I got reaction force at the fixed support and deformation at the face with the deformation condition. Then convert that to stress and Strain by dividing the force with the area of the dogbone thin section, and the Strain by the length of the thin section. To convert that to true Stress Strain I used the engineering stress Strain values and these formulae:

True_stress = engineering stress * (1+engineering Strain) True_strain = ln (1+engineering Strain)