Volume 2, Number 1, Winter 1994
ENERGY LOSS IN STEADYSTATE SOLUTIONS
TO VISCOELASTIC CRACK PROBLEMS
J.M. GOLDEN AND G.A.C. GRAHAM
Abstract. The average rate of dissipation of mechanical
energy per cycle is considered for a cracked viscoelastic
body under two types of periodic loading, namely a tensilecompressive
cycle and an asymmetric bending cycle involving
partial closure at one end only. An expression is given for the
energy loss per cycle in terms of the rate of work done by the
boundary forces. It is shown that the rate of work done by
the boundary stresses and the rate of energy dissipation are
independent of whether the stresses are taken to act on the
infinite boundary or on the crack face, even when periodic full
or partial closure occurs. Extension criteria for cracks under
a bending moment are discussed. Some numerical results are
presented for the average rate of energy loss per cycle.
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