For a beam, if fundamental equations of statics are not sufficient to determine all the reactive forces at the supports, the structure is said to be

The field of strength of materials typically refers to various methods of calculating the stresses and strains in structural members, such as beams, columns, and shafts.

A material's strength in a given application depends on many factors, including its resistance to deformation and cracking, and it often depends on the shape of the member being designed.