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Boundary Elements Analysis Of ViscoelasticFracture

When linear viscoelasticity theory is applied to the analysis of the traction boundary value problem for a cracked body, the correspondence principle, (Creus [1]) indicates that stresses remain constant in time. Thus, when a K-type stress intensity criterion for crack growth is applied, no deferred effect appears to be possible. On the other hand, experiential results,(Kanninen [3]) indicate that cracks in viscoelastic materials do grow under constant loads well beneath the elastic fracture load level.