Assessment of initiation criteria used in interlaminar fracture tests of composites

被引：31
|
作者：
de Morais, AB
de Moura, MFSF
机构：
[1] Univ Aveiro, Dept Mech Engn, P-3810193 Aveiro, Portugal
[2] Univ Porto, Dept Mech Engn & Ind Management, Fac Engn, P-4200465 Oporto, Portugal
来源：
ENGINEERING FRACTURE MECHANICS | 2005年 / 72卷 / 17期
关键词：
fracture toughness; crack initiation; finite element analysis (FEA); non-linearity; 5% offset or maximum load;
D O I：
10.1016/j.engfracmech.2005.05.003
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Finite element (FE) simulations of delamination growth in mode I double cantilever beam (DCB) and mode II endnotched flexure (ENF) specimens were conducted in order to evaluate the non-linearity (NL) and 5% offset or maximum load (5%-Max) criteria. The results showed a good performance of the 5%-Max criterion, while the NL criterion was inadequate for the ENF test. However, it was also found that large process zones in common ENF specimens may lead to significant toughness underestimations. In order to obtain accurate results it was necessary to increase the starter crack length and the support span. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2615 / 2627
页数：13
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