期刊
COMPOSITE STRUCTURES
卷 92, 期 8, 页码 1857-1864出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2010.01.012
关键词
Delamination; Cohesive zone model; Cohesive elements; Fracture
资金
- Spanish government through DG-GICYT [MAT2006-14159-C02-01]
- Jose Castillejos program [JC2008-00400]
- Portuguese Foundation for Science and Technology (FCT) [PTDC-EME-PME-64984-2006]
- Fundação para a Ciência e a Tecnologia [PTDC/EME-PME/64984/2006] Funding Source: FCT
A methodology for predicting accurately the propagation of delamination under mixed-mode fracture with cohesive elements is proposed. It is shown that changes in the local mode ratio during the evolution of damage under mixed-mode loading can cause errors in the determination of the energy dissipation and result in inaccurate predictions of the global load-displacement response - even under conditions where, according to Linear Elastic Fracture Mechanics, the global mode ratio is constant. To address this difficulty, relations between the interlaminar strengths and the penalty stiffness are proposed which ensure a correct energy dissipation when delamination propagates. The validity of the proposed methodology is demonstrated for different mode ratios by comparison with the corresponding analytical solutions. (C) 2010 Elsevier Ltd. All rights reserved.
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