Why Von Mises stress is maximum/high under compressive loading?Technically compressive forces acts at the weakest point..how can a point having maximum compressive forces acting on it show highest von mises stress?
Dear Emily,
1) metals also yield and break even when subjecetd to a compressive uniaxial stress;
2) von Mises stress measures the energy of the deviatoric stress, which (in simple words) is that part of stress which changes the shape, but not the volume. Therefore it can be positive (and high) even under a compressive stress. It is zero only with hydrostatic stress, where all principal stresses are equal (s1=s2=s3)
Von Mises stress is always positive, look up its definition. Basically, it is the square of the differences of the principal stresses.
Dear Emily,
1) metals also yield and break even when subjecetd to a compressive uniaxial stress;
2) von Mises stress measures the energy of the deviatoric stress, which (in simple words) is that part of stress which changes the shape, but not the volume. Therefore it can be positive (and high) even under a compressive stress. It is zero only with hydrostatic stress, where all principal stresses are equal (s1=s2=s3)
The statement is not true. The Von Mises stress is the same in case of pure compression or tension load, with free lateral boundaries, if the compressive/tensile stress has the same magnitude (different sign).
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