A two dimensional diagram of a particular plane (Mohr plane) of the three dimensional stress state. The Mohr plane contains two of the principal stresses σi > σj, and depicts the shear and normal stresses on planes of all possible orientation whose normals lie in the Mohr plane. Details on use and construction of Mohr diagrams can be found in Jaeger and Cook (1971). See Lockner and Beeler (2002)