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Laminated composite structures subjected to compressive loading: A material and structural buckling analysis

机译：承受压缩载荷的层合复合结构：材料和结构屈曲分析

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摘要

In order to improve confidence in composite structures design, a better description of the failure of laminates is necessary. A recent international exercise has evidenced that the current approaches overestimate drastically the strength of composites under compressive loadings, even for quasi-isotropic laminates. In the present paper, a complete approach is developed in order to overcome this problem. Firstly, a material multiscale failure approach, which can predict the failure for different stacking sequences under a large loading range, is proposed. This model describes accurately the failure of laminates when the final rupture is only due to material aspects (ply failures without buckling). Secondly, a structural analysis, taking buckling into account, is performed in order to improve the predictive accuracy of the model under compressive loadings. A simple method is proposed to predict buckling loads and the post-buckling behaviour, even in the case of a highly non-linear material behaviour. Comparisons between modelling and experimental results show quite a good agreement.
机译：为了提高对复合结构设计的信心，必须对层压板的失效进行更好的描述。最近的一项国际研究表明，即使是准各向同性的层压板，目前的方法也大大高估了复合材料在压缩载荷下的强度。在本文中，开发了一种完整的方法来克服此问题。首先，提出了一种材料多尺度破坏方法，该方法可以预测大载荷范围内不同堆叠顺序的破坏。当最终破裂仅是由于材料方面的原因（没有屈曲的层破裂）时，该模型可以准确地描述层压板的失效。其次，进行结构分析，考虑到屈曲，以提高模型在压缩载荷下的预测精度。提出了一种简单的方法来预测屈曲载荷和屈曲后的行为，即使在高度非线性的材料行为中也是如此。建模与实验结果之间的比较显示出很好的一致性。

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