TITLE:
Selective Activation of Intrinsic Cohesive Elements
AUTHORS:
Kyeongsik Woo, William M. Peterson, Douglas S. Cairns
KEYWORDS:
Intrinsic CZM, Arbitrary Crack Propagation, Added Compliance, Selective Activation, Multi-Point Constraint
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.2 No.12,
November
25,
2014
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.