Question

Explain theory of virtual work and energy.

Answer 1

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If a system in equilibrium under the action of a set of forces is given a virtual displacement, the virtual work done by the forces will be zero.” The terms used in this statement are defined as follows: ... - Its extension to dynamics was made possible by D'Alembert who introduced the concept of the inertia force.

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Answer 2

Virtual work arises in the application of the principal of least action to the study of force and movement of a mechanical system. The work of a force on a particle along a virtual displacement is known as the virtual work.

Energy methods are the methods based on linear elastic behavior and conservation of energy such as, the work done by external forces equals the energy stored in the structure under load.