An XFEM-based methodology for fatigue delamination and permeability of composites
An XFEM-based methodology for fatigue delamination and permeability of composites
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DOI：
10.1016/j.compstruct.2013.07.050
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发表时间：
2014
影响因子：
6.3
通讯作者：
D. Grogan;S. Leen;C. M. Brádaigh
中科院分区：
文献类型：
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作者：
D. Grogan;S. Leen;C. M. Brádaigh
提出了一种模拟复合材料热疲劳分层、预测分层裂纹张开位移（DCOD）和复合材料层合板渗透率的方法。这对复合材料低温燃料箱的安全设计至关重要。该方法是基于扩展有限元法模拟裂纹扩展，不需要先验定义的初始裂纹（分层）长度或裂纹扩展路径相比之下，以前的工作需要估计分层长度和相应的热循环次数的基础上的实验测量。该方法进行了验证，从标准化的静态和疲劳分层测试方法的测量。在准各向同性层合板在低温疲劳载荷下的分层裂纹扩展的预测是用来建立初始层间缺陷长度对随后的裂纹扩展的影响，以及分层长度对DCOD和渗透率的影响。一个关键的额外的好处是，所提出的方法可以模拟两个层间和层内裂纹生长在二维和三维几何形状。
A methodology for the simulation of thermal fatigue delamination in composites and prediction of delaminated crack opening displacement (DCOD) and composite laminate permeability is presented. This is critical for the safe design of composite cryogenic fuel tanks. The methodology, which is based on an extended finite element method for simulation of crack growth, does not require aprioridefinition of initial crack (delamination) length or crack propagation path. In contrast, previous work required estimation of delamination length and corresponding number of thermal cycles based on experimental measurements. The methodology is validated against measurements from standardised static and fatigue delamination test methods. Prediction of delamination crack growth in a quasi-isotropic laminate under cryogenic fatigue loading is used to establish the effect of initial interlaminar defect length on subsequent crack growth, as well as the effect of delamination length on DCOD and permeability. A key additional benefit is that the proposed method can simulate both inter- and intralaminar crack growth in two- and three-dimensional geometries.