We know when a metal is subjected to proper loading, there exists plastic strain. A great part of plastic strain is developed from the slipping of the crystal planes of that metal in microstructure level. Now, when the load is uniaxial, it is simple to calculate the amount of shear strain acts on that plane. But, when the load is not uniaxial, the life is harder. It is very hard to calculate which slip plane feels how much shear strain.
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