When using *MAT_24, one should input a smoothed stress-strain curve utilizing a minimal number of points. True stress = (engineering stress) * exp(true strain) = (engineering stress) * (1 + engineering strain) where exp(true strain) is 2.71 raised to the power of (true strain).īe aware that experimental data always includes some degree of error and thus tends to be somewhat noisy or erratic. ![]() True strain = ln(1 + engineering strain) where ln designates the natural log true strain, not engineering stress or strain. First of all, you may check that your experimental data from a uniaxial tension test is expressed in terms of true stress vs.
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