Why engineering stress vs true stress10/31/2023 ![]() ![]() Strain is the relative internal change in shape of an infinitesimally small cube of material and can be expressed as a non-dimensional change in length or angle of distortion of the cube. Deflection is the relative change in external displacements on an object. ![]() Displacements are the absolute change in position of a point on the object. In engineering, deformation refers to the change in size or shape of an object. Compressive stress results in deformation which shortens the object but also expands it outwards.
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