The true stress and true strain take into account the

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The true stress and true strain take into account the changing area of the cross section as it is being elongated, and the strains that accompany the changing area. Accounting for these two effects results in a final true stress that is much higher than the engineering fracture stress and a greater amount of strain. true stress reaches a maximum at the point of fracture. At this point, the area is much smaller, so the specimen cannot withstand a large load, which causes the engineering stress-strain curve to drop off after necking. There is no ultimate tensile stress in the true stress-strain curve as with the engineering stress-strain curve, and the true stress is always increasing up until fracture. Conclusion: Measured the uniaxial stress-strain curve Extracted elastic, plastic and failure material properties for smooth 6061-T6 aluminum test specimen Studied relationship between hardness and elastic, plastic, and failure material properties Measured critical stress intensity factor for cracked aluminum test specimen.
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References: - smooth-specimen_fig5_275236797
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