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Studies of dynamic crack propagation and arrest in polymeric materials are generally interpreted using rate-independent elastic analyses. To ascertain the importance of the viscoelastic constitutive behavior exhibited by polymers that is neglected in these approaches, a simple mathematical model for dynamic viscoelastic crack propagation in wedge-loaded double cantilever beam (DCB) test specimens has been developed. Computational results have been obtained for four different polymers using a three-parameter solid linear viscoelastic constitutive representation. In comparing these results with rate-independent elastic behavior, it is found that significant differences in the crack propagation/arrest process do exist. However, close correlations can nevertheless be obtained if, in displaying experimental results, proper account is taken of the viscoelastic properties.
double cantilever beam specimen, viscoelastic, crack propagation, crack arrest, dynamic viscoelasticity, Araldite B, Homalite, PMMA, Cleareast
Professor, The Ohio State University, Columbus, Ohio
Senior research scientist, Battelle Memorial Institute, Columbus Laboratories, Columbus, Ohio