International Journal of Non-Linear Mechanics ( IF 3.2 ) Pub Date : 2020-08-24 , DOI: 10.1016/j.ijnonlinmec.2020.103591 M.H. Nagaraj , E. Carrera , M. Petrolo
The present work deals with the progressive damage analysis of composite laminates subjected to low-velocity impact. We develop a numerical model using higher-order structural theories based on the Carrera Unified Formulation (CUF) with Lagrange polynomials and resulting in a 2D refined layer-wise model. To model damage, we use a combination of the continuum damage-based CODAM2 intralaminar damage model to account for fibre and matrix damage within the ply, and cohesive elements to account for delamination between successive composite plies. We carry out numerical assessments for the case of a linear elastic composite plate subjected to impact, to compare the current framework with standard approaches based on 3D finite element (FE) analysis. We, then, consider the elastoplastic analysis of a bimetallic laminated plate to compare the performance of the proposed layer-wise model and 3D-FE approaches, for the case of nonlinear impact analysis. The final assessment considers progressive damage due to low-velocity impact, and the results are compared with available literature data. The numerical predictions show a good correlation with reference experimental and simulation results, thus validating the current framework for impact analysis of composite structures. Comparisons of the proposed layer-wise structural models with those based on 3D finite elements demonstrate the improved computational efficiency of the CUF models in terms of model size and analysis time.
中文翻译:
使用2D分层结构模型对低速冲击下的复合材料层板进行渐进式损伤分析
目前的工作涉及承受低速冲击的复合材料层板的渐进式损伤分析。我们使用基于带有Lagrange多项式的Carrera统一公式(CUF)的高阶结构理论开发了一个数值模型,并生成了2D精细的分层模型。为了建模损伤,我们结合使用基于连续损伤的CODAM2层内损伤模型来解释层中的纤维和基质损伤,并使用内聚元素来解决连续复合层之间的分层。我们对遭受冲击的线性弹性复合板的情况进行了数值评估,以将当前框架与基于3D有限元(FE)分析的标准方法进行比较。然后我们,考虑到非线性冲击分析的情况,请考虑对双金属层压板进行弹塑性分析,以比较建议的分层模型和3D-FE方法的性能。最终评估考虑了由于低速撞击而造成的渐进式破坏,并将结果与现有文献数据进行了比较。数值预测与参考实验和仿真结果显示出良好的相关性,从而验证了目前用于复合结构冲击分析的框架。将拟议的分层结构模型与基于3D有限元的模型进行比较,表明CUF模型在模型大小和分析时间方面的计算效率得到了提高。最终评估考虑了由于低速撞击而造成的渐进式破坏,并将结果与现有文献数据进行了比较。数值预测与参考实验和仿真结果显示出良好的相关性,从而验证了目前用于复合结构冲击分析的框架。将拟议的分层结构模型与基于3D有限元的模型进行比较,表明CUF模型在模型大小和分析时间方面的计算效率得到了提高。最终评估考虑了低速撞击造成的渐进式破坏,并将结果与现有文献数据进行了比较。数值预测与参考实验和仿真结果显示出良好的相关性,从而验证了目前用于复合结构冲击分析的框架。将拟议的分层结构模型与基于3D有限元的模型进行比较,表明CUF模型在模型大小和分析时间方面的计算效率得到了提高。