Notches
Cracks caused by notches in a material, (Taylor, David)
Crack in a single copper crystal caused by a notched section. (Suresh, S)
Cracks caused by notches in a material, (Taylor, David)
Crack in a single copper crystal caused by a notched section. (Suresh, S)
Notches can be thought of as areas of stress concentration. Since the surface area of the notch is smaller than the surface area of the rest of the solid it is the first part to fail. Notches can be caused by a number of things such as screw holes or collisions.