Numerical investigation of progressive damage and the effect of layup in overheight compact tension tests
Numerical investigation of progressive damage and the effect of layup in overheight compact tension tests
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超高紧凑拉伸试验中渐进损伤和叠层效应的数值研究
DOI：
10.1016/j.compositesa.2012.03.002
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发表时间：
2012
影响因子：
8.7
通讯作者：
M. Wisnom
中科院分区：
文献类型：
--
作者：
Xiangqian Li;S. Hallett;M. Wisnom
本文对缺口纤维增强复合材料层合板的渐进损伤发展进行了数值研究。使用有限元方法，使用界面单元以分层和劈裂的形式对亚临界损伤进行显式建模，并使用渐进统计破坏理论对纤维破坏进行建模。采用由IM7/8552碳/环氧预浸料组成的五种不同铺层，对超高压缩拉伸(OCT)试件进行了失效预测。由于对各个破坏模式进行了详细的建模，它们之间的相互作用具有很好的特点。得到的数值结果与详细的试验观测结果相吻合，包括分层、层内劈裂和纤维断裂。通过在模型中考虑发生在缺口尖端的亚临界损伤，它能够反映应力集中的影响，从而能够预测最终的试件失效。
This work describes a numerical investigation into progressive damage development in notched fibre-reinforced composite laminates. A finite element approach is used which explicitly models the sub-critical damage in the form of delamination and splits using interface elements, and fibre failure using a progressive statistical failure theory. Failure predictions were made for Overheight Compact Tension (OCT) test specimens using five different layups made up from IM7/8552 carbon/epoxy pre-preg. Owing to the detailed modelling of the individual damage modes, their interaction is well characterised. The numerical results obtained compare well with detailed test observations, capturing delamination, intraply splitting and fibre breakage. By including the subcritical damage that occurs at the notch tip in the model, it is able to represent the effect on the stress concentration and hence to predict ultimate specimen failure.