If the strain energy of a deformed elastic body is represented as a function of the displacements d1, d2, ...., a partial derivative of that function with respect to any chosen displacement gives the corresponding force. This statement/ principle is called as
1
Principle of strain energy
2
Maxwell's law of reciprocal delfections
3
Conjugate beam/ truss principle
4
First theorem of Castigliano
5
Bette's law