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kelvin490
Gold Member
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Before yield we know that stress/strain= E. Can we obtain the same E if we substitute true stress and true strain in the equation? Why
True stress takes into account the actual cross-sectional area of a material at any given point, while engineering stress assumes a constant cross-sectional area throughout the test. This means that true stress values will be higher than engineering stress values in the later stages of deformation.
True strain is calculated by taking the natural logarithm of the ratio between the final length of a material and its original length.
True stress and strain provide more accurate measurements of a material's behavior under stress and deformation, especially in the later stages of testing. This is important for understanding the material's true strength and properties.
No, true stress and true strain cannot be directly measured as they require knowledge of the actual cross-sectional area and length of the material, which can change during the test. They are instead calculated using engineering stress and strain values.
One limitation is that true stress and strain can only be accurately calculated for homogeneous materials. They also do not account for any plastic deformation that may occur during testing. Additionally, the calculation involves taking the natural logarithm, which can introduce errors in the final values.