Sun Qingping, Zhou Guowei, Tang Haibin, Meng Zhaoxu, Jain Mukesh, Su Xuming, Han Weijian
Key Laboratory for Light-weight Materials, Nanjing Tech University, Nanjing 210009, China.
Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Compos Struct. 2021 Apr;261. doi: 10.1016/j.compstruct.2021.113592. Epub 2021 Jan 19.
In this work, multi-scale finite element analyses based on three-dimensional (3D) hybrid macro/micro-scale computational models subjected to various loading conditions are carried out to examine the in-situ effect imposed by the neighboring plies on the failure initiation and propagation of cross-ply laminates. A detailed comparative study on crack suppression mechanisms due to the effect of embedded laminar thickness and adjacent ply orientation is presented. Furthermore, we compare the results of in-situ transverse failure strain and strength between the computational models and analytical predictions. Good agreements are generally observed, indicating the constructed computational models are highly accurate to quantify the in-situ effect. Subsequently, empirical formulas for calculating the in-situ strengths as a function of embedded ply thickness and different ply angle between embedded and adjacent plies are developed, during which several material parameters are obtained using a reverse fitting method. Finally, a new set of failure criteria for - , - , and - accounting for the in-situ strengths are proposed to predict laminated composites failure under multi-axial stress states. This study demonstrates an effective and efficient computational technique towards the accurate prediction of the failure behaviors and strengths of cross-ply laminates by including the in-situ effects.
在这项工作中，基于三维（3D）混合宏观/微观尺度计算模型，对承受各种载荷条件的情况进行了多尺度有限元分析，以研究相邻层对正交铺层层合板失效起始和扩展所施加的原位效应。给出了关于由于嵌入层厚度和相邻层取向的影响而产生的裂纹抑制机制的详细对比研究。此外，我们比较了计算模型与解析预测之间的原位横向失效应变和强度结果。总体上观察到良好的一致性，表明所构建的计算模型在量化原位效应方面具有高度准确性。随后，开发了用于计算作为嵌入层厚度以及嵌入层与相邻层之间不同铺层角度函数的原位强度的经验公式，在此过程中使用反向拟合方法获得了几个材料参数。最后，提出了一套考虑原位强度的针对 - 、 - 和 - 的新失效准则，以预测多轴应力状态下层合复合材料的失效。这项研究展示了一种有效且高效的计算技术，通过纳入原位效应来准确预测正交铺层层合板的失效行为和强度。
