Selective Activation of Intrinsic Cohesive Elements

Kyeongsik Woo^1*, William M. Peterson², Douglas S. Cairns²

¹School of Civil Engineering, Chungbuk National University, Cheongju, Chungbuk, Korea.
²Department of Mechanical & Industrial Engineering, Montana State University, Bozeman, MT, USA.

DOI: 10.4236/jamp.2014.212121                

Abstract

In this paper, a selective activation strategy is studied in order to alleviate the issue of added compliance in the intrinsic cohesive zone model applied to arbitrary crack propagation. This strategy proceeds by first inserting cohesive elements between bulk elements and subsequently tying the duplicated nodes across the interface using controllable multi-point constraints before the analysis begins. Then, during the analysis, a part of the multi-point constraints are selectively released, thereby reactivating the corresponding cohesive elements and allowing cracks to initiate and propagate along the bulk element boundaries. The strategy is implemented in Abaqus/Standard using a user-defined multi-point constraint subroutine. Analysis results indicate that the strategy significantly alleviates the added compliance problem and reduces the computation time.

Keywords

Intrinsic CZM, Arbitrary Crack Propagation, Added Compliance, Selective Activation, Multi-Point Constraint

Conflicts of Interest

The authors declare no conflicts of interest.

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