Any elastic material which is subject an applied force is deformed.
There are clearly defined relationships between the applied forces and the resulting deformations. This
page indentifies these relationships.

Symbols / Units

L = length (m)
F = Force (N) σ_{1} = principal stress normal to σ_{2} & σ_{3}(N/m^{2}) σ_{2} = principal stress normal to σ_{1} & σ_{3}(N/m^{2}) σ_{2} = principal stress normal to σ_{1} & σ_{2}(N/m^{2})
G = Modulus of Rigidity (N/m^{2})
E = Young's moudulus of elasticity (N/m^{2})

υ = Poissan's ratio ε_{1} = strain in direction of σ_{1} ε_{2} = strain in direction of σ_{2} ε_{3} = strain in direction of σ_{3} δ = deflection(m) τ = shear stress (N/m^{2}) φ = shear strain (radians)