J V

The real and virtual displacements, being constant, can be taken outside the integral, to give

The virtual displacements, {«}, are arbitrary and nonzero, hence

{/>} = f [B]JE[B] dv {«} = [*'(e)]{«} Jv where [k'(e}] = Jjt[£]T£[fi] dv, which is an identical result to eqn. (9.40). Substituting from eqn. (9.82) gives

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