The applied stress to overcome the resistance of a perfect lattice to shear is the theoretical yield strength, τ max. The stress displacement curve of a plane of atoms varies sinusoidally as stress peaks when an atom is forced over the atom below and then falls as the atom slides into the next lattice point.

ment. It assumes that yielding starts in planes of maximum shear stress. According to this theory, yielding will start at a point when the maximum shear stress at that point reaches one-half of the the uniaxial yield strength, F y. Thus for a biaxial state of stress where 1 > 2, the maximum shear stress will be (1 2)/2. Yielding will occur when.

Shear strain is a type of strain that occurs when the particles of a material slide past each other in a parallel direction, causing a change in the shape of the material. It is measured as the change in angle between two originally perpendicular lines in the material.

depends on how you look at it. either way, friction would oppose the force pushing the material, which is why the bend is not instantaneous. The way that he shows shearing is true if the force pushing the material is constant. if the force is instantaneous however,then because of friction, it will not bend as far before bouncing back. Comment.