Multiscale modeling of free-surface effect on crack formation in unidirectional off-axis laminates
Multiscale modeling of free-surface effect on crack formation in unidirectional off-axis laminates
复制标题
单向离轴层压板裂纹形成的自由表面效应的多尺度建模
DOI：
10.1016/j.compositesa.2017.03.016
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Kenichi Yoshioka
中科院分区：
文献类型：
--
作者：
Yuta Kumagai;Sota Onodera;Yoshiko Nagumo;Tomonaga Okabe;Kenichi Yoshioka
将基于网格叠加法的多尺度方法应用于单向碳纤维复合材料层合板，以评估自由表面附近变形场对裂纹形成的影响。我们的方法采用了两种不同的尺度分析：局部分析采用微米尺度直径的碳纤维和基体树脂组成的模型，整体分析采用均质模型假设为各向异性弹塑性体。对层合板的宏观变形行为进行了全局分析。局部模型叠加在全局模型上，保持了全局域与局部域位移场的连续性。然后利用全局分析得到的位移场进行局部分析来预测裂纹的起裂和扩展。模拟结果表明，自由表面产生的初始裂纹对最终破坏应变没有影响。
A multiscale approach based on the mesh superposition method is applied to unidirectional CFRP laminates to evaluate the influence of the deformation field near the free-surface region on crack formation. Our approach employs two different scale analyses: local analysis utilizing a model composed of carbon fibers with micron-scale diameter and matrix resin, and global analysis employing a homogenized model assumed to be an anisotropic elasto-plastic body. Global analysis is conducted to evaluate the macroscopic deformation behavior of laminates. The local model is superimposed on the global model, maintaining the continuity of the displacement field between global and local domains. Local analysis is then performed to predict crack initiation and crack propagation, using the displacement field obtained from the global analysis. Our simulated results indicate that the initial crack occurring on the free-surface region does not affect the final failure strain.