Title

Dynamic failure of weak complex interfaces

Document Type

Conference Proceeding

Date of Original Version

12-1-2005

Abstract

Asymmetric impact is used to generate shear loading and to propagate dynamic mode-II cracks along the weakly bonded interfaces of two otherwise identical homogeneous constituents. The initial path is then made to deviate from planarity by introducing a kink directed at an arbitrary angle with respect to the loading direction. In another configuration, a self-similar extension of the initial horizontal path and a kink are simultaneously offered to the incoming crack as possible paths. The experiments show that, when the mode-II crack reaches a single branch, it favors certain path inclinations as alternate routes for continued mixed-mode crack advancement, whereas some other inclinations suppress further crack growth. In the presence of dual weakened paths, competing stress fields alternatively favor crack extension along either of the two presented paths in a manner that cannot be inferred from what is observed in the single kink cases. The two sets of experiments are compared and the behavior of the crack beyond its original path is explained in light of the known stress fields of a dynamic mode-II crack. The experiments are conducted with crack speeds residing in both the sub-Rayleigh and intersonic ranges.

Publication Title

Proceedings of the 2005 SEM Annual Conference and Exposition on Experimental and Applied Mechanics

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