Principle of Virtual Work topics include: Work, conservative forces, potential energy, equilibrium potential energy criterion and stability configurations. The principle of virtual work (PVW) states that the virtual work of the forces applied to a system is zero when the system is in equilibrium.  The PVW states that the stress, body force, and traction are in equilibrium if and only if the IVW equals the EVW for every virtual displacement field.  The PVW was originally used to examine systems of rigid structures. It is a powerful method for solving problems involving several connected... Show more

Principle of Virtual Work topics include: Work, conservative forces, potential energy, equilibrium potential energy criterion and stability configurations.

The principle of virtual work (PVW) states that the virtual work of the forces applied to a system is zero when the system is in equilibrium. 

The PVW states that the stress, body force, and traction are in equilibrium if and only if the IVW equals the EVW for every virtual displacement field. 
The PVW was originally used to examine systems of rigid structures. It is a powerful method for solving problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. 

The PVW was also known as “the law of lever” and was used by the Greeks, medieval Arabs, and Latins.

The potential energy criterion for equilibrium states that for systems with multiple degrees of freedom, the partial derivative of potential energy with respect to each coordinate must be zero for equilibrium. 

The stability at the equilibrium configuration remains as long as its potential energy is minimum at that configuration.

A stable configuration is a state that is not subject to variation. It is also known as a state of minimum energy.

 

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