A viscoplastic constitutive model for dynamic fracture |
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Affiliation: | 1. College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China;2. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720, USA |
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Abstract: | The use of a viscoplastic approach to dynamic fracture prediction is proposed with the aim of producing a model which is applicable to ductile situations. A numerical (finite-element) approach is adopted with specially developed joint elements being used to simulate behaviour within the fracture-process zone. Results are presented for an expanding edge-crack problem. Experimental results are used to calibrate the numerical model by determining the material-specimen parameters under dynamic-fracturing conditions. Detailed results are presented for both LEFM and nonlinear fracture-mechanics approaches. |
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