This chapter contains sections titled: Introduction Basic Failure Mechanisms Spallation on Convex Surfaces Spallation on Flat (or Nearly Flat) Surfaces. General Description of the Mechanism Spallation on Flat (or Nearly Flat) Surfaces. Early Models Spallation on Flat (or Nearly Flat) Surfaces. Failure Model Basing on Fracture-Mechanical Mechanisms Spallation at Sharp Edges Conclusions