What are stress functions?

Stress Functions

In linear elasticity, the equations describing the deformation of an elastic body subject only to surface forces on the boundary are (using index notation) the equilibrium equation:

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Some articles on stress functions:

Stress Functions - Prandtl Stress Function
... The Prandtl stress function is a special case of the Morera stress functions, in which it is assumed that A=B=0 and C is a function of x and y only ...

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