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Progressive delamination of laminated composites via 1D models

机译：通过一维模型对层状复合材料进行分层

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摘要

This paper presents a novel numerical framework to simulate the progressive delamination in laminated structures based on 1D component-wise models. The proposed numerical tool is a part of the virtual testing platform built within the Carrera Unified Formulation, a hierarchical, higher-order structural framework to generate theories of structures via a variable kinematic approach. Formulated within the Lagrange polynomial CUF models, the component-wise approach models the components of a complex structure through 1D CUF models at reduced computational costs and 3D-like accuracies. The effectiveness of CUF-CW models to capture accurate 3D transverse fields are of interest to solve delamination problems by integrating a class of higher-order cohesive elements to simulate the cohesive mechanics among the various components of the structure. The present framework adopts a bilinear constitutive law based on the mixed-mode delamination propagation and an efficient arc-length solver based on an energy-dissipation constraint. The numerical results aim to verify the accuracy and computational efficiency of CUF-CW models through benchmark composite delamination problems including multiple delamination fronts and comparisons with reference literature solutions and standard 3D FEM models. The outcomes show multi-fold improvements in the analysis times, good matches with experimental results, and promising enhancements of the meshing process due to the absence of aspect ratio constraints.
机译：本文提出了一种新颖的数值框架，用于基于一维构件模型来模拟层压结构中的渐进分层。拟议中的数值工具是在Carrera统一公式内构建的虚拟测试平台的一部分，该框架是一种分层的高阶结构框架，可通过可变运动学方法生成结构理论。在Lagrange多项式CUF模型中进行表示，基于组件的方法通过一维CUF模型以较低的计算成本和类似3D的精度对复杂结构的组件进行建模。通过集成一类高阶内聚元素来模拟结构各个组件之间的内聚力学，CUF-CW模型捕获准确的3D横向场的有效性对于解决分层问题很有意义。本框架采用基于混合模式分层传播的双线性本构定律和基于能量耗散约束的有效弧长求解器。数值结果旨在通过基准复合分层问题（包括多个分层前沿以及与参考文献解决方案和标准3D FEM模型的比较）来验证CUF-CW模型的准确性和计算效率。结果表明，由于没有宽高比的限制，分析时间得到了多次改进，与实验结果具有很好的匹配性，并且网格化过程有望得到改善。

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