Substituting the expression for virtual strain from eqn. (9.34) and the real stress from eqn. (9.36) into eqn. (9.11) gives the internal virtual work as

Since the real and virtual displacements are constant, they can be taken outside the integral, to give

The external virtual work will be given by

Substituting from eqns. (9.37) and (9.38) into the equation of the principle of virtual work, eqn. (9.10) gives

(TTlTiDl r-rrlT / tdiT

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