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An XFEM-based methodology for fatigue delamination and permeability of composites

机译：基于XFEM的复合材料疲劳分层和渗透性方法

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摘要

A methodology for the simulation of thermal fatigue delamination in composites and prediction of del-aminated 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 a priori definition 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.
机译：提出了一种模拟复合材料中热疲劳分层并预测del-氨基化裂纹开口位移（DCOD）和复合材料层压板渗透性的方法。这对于复合低温燃料箱的安全设计至关重要。该方法基于扩展有限元方法来模拟裂纹扩展，不需要事先定义初始裂纹（分层）长度或裂纹扩展路径。相反，以前的工作需要根据实验测量值估算脱层长度和相应的热循环次数。该方法论已通过标准化静态和疲劳分层测试方法的测量结果进行了验证。通过对准各向同性层压板在低温疲劳载荷下的分层裂纹扩展进行预测，可以确定初始层间缺陷长度对后续裂纹扩展的影响，以及分层长度对DCOD和渗透率的影响。一个关键的附加好处是，该方法可以在二维和三维几何形状中模拟层间和层内裂纹扩展。

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