Study of dynamic crack branching using intrinsic cohesive surfaces with variable initial elastic stiffness Pablo D. Zavattieri General Motors Research and Development Center, Warren, MI 48090 ABSTRACT As observed by Needleman and co-workers [1], it is still not clear to what extent the initially elastic cohesive surfaces are more appropriate than the initially rigid cohesive surfaces for a given application. In this work, an analysis where the initially elastic model is approached asymptotically to the initially rigid is proposed. The purpose of this analysis is to gain more insight into the numerical mechanisms that lead to different results using different approaches. It was found that convergence is only achieved when the initial cohesive stiffness is much higher than the bulk stiffness. When a relative low value of this cohesive stiffness is chosen, crack tip speed is delayed and branching is artificially increased. GM R&D report # 9650, Aug. 2003.
Study of dynamic crack branching using intrinsic cohesive surfaces with variable initial elastic stiffness
May 23, 2023
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