An integrated computational materials engineering framework to analyze the failure behaviors of carbon fiber reinforced polymer composites for lightweight vehicle applications
An integrated computational materials engineering framework to analyze the failure behaviors of carbon fiber reinforced polymer composites for lightweight vehicle applications
复制标题
用于分析轻型汽车应用中碳纤维增强聚合物复合材料失效行为的集成计算材料工程框架
DOI：
10.1016/j.compscitech.2020.108560
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发表时间：
2021-01-20
影响因子：
9.1
通讯作者：
Su, Xuming
中科院分区：
文献类型：
--
作者：
Sun, Qingping;Zhou, Guowei;Su, Xuming
采用自下而上的多尺度建模方法，开发了一种用于碳纤维增强聚合物(CFRP)复合材料的集成计算材料工程(ICME)框架，该框架有可能缩短轻量化车辆结构应用的开发到部署周期。在这项工作中，我们开发和集成了由四个尺寸尺度组成的计算模型，以全面描述和表征三种类型的CFRP复合材料。通过分析梯度模型和纳米尺度下的分子动力学分析确定界面区域的性质，并将其引入微尺度单向代表性体积元(RVE)模型，以表征UD CFRP复合材料的破坏强度和包络。在此基础上，提出了UD复合材料的弹塑性损伤本构关系，并将其应用于机织复合材料纤维丝束和片材复合材料切屑的研究。随后，利用细观RVE模型对机织和SMC复合材料的破坏机理和破坏强度进行了预测。最后，基于模型和低比例尺的结果，我们表明，均匀的宏观模型可以捕捉到帽子形截面零件在四点弯曲下的力学性能。在模型积分的同时，我们还将证明计算结果与在不同尺度上进行的实验结果很好地吻合。本研究展示了集成的多尺度计算建模工具的潜力和意义，它可以虚拟地评估CFRP复合材料的性能，并为CFRP复合材料在结构应用中的应用提供设计指导。
A bottom-up multi-scale modeling approach is used to develop an Integrated Computational Materials Engineering (ICME) framework for carbon fiber reinforced polymer (CFRP) composites, which has the potential to reduce development to deployment lead time for structural applications in lightweight vehicles. In this work, we develop and integrate computational models comprising of four size scales to fully describe and characterize three types of CFRP composites. In detail, the properties of the interphase region are determined by an analytical gradient model and molecular dynamics analysis at the nano-scale, which is then incorporated into micro-scale unidirectional (UD) representative volume element (RVE) models to characterize the failure strengths and envelopes of UD CFRP composites. Then, the results are leveraged to propose an elasto-plastic-damage constitutive law for UD composites to study the fiber tows of woven composites as well as the chips of sheet molding compound (SMC) composites. Subsequently, the failure mechanisms and failure strengths of woven and SMC composites are predicted by the meso-scale RVE models. Finally, building upon the models and results from lower scales, we show that a homogenized macro-scale model can capture the mechanical performance of a hat-section-shaped part under four-point bending. Along with the model integration, we will also demonstrate that the computational results are in good agreement with experiments conducted at different scales. The present study illustrates the potential and significance of integrated multi-scale computational modeling tools that can virtually evaluate the performance of CFRP composites and provide design guidance for CFRP composites used in structural applications.