Impact Crush Modeling of Chopped Fiber Reinforced Polymers
Impact Crush Modeling of Chopped Fiber Reinforced Polymers
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短切纤维增强聚合物的冲击破碎建模
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
U. Gandhi
中科院分区：
文献类型：
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作者：
S. DorMohammadi;F. Abdi;R. Mandapati;H. Baid;Mike Lee;U. Gandhi
短切纤维增强聚合物复合材料被认为用于许多汽车应用中。常用的结构设计软件难以预测短纤维或长纤维增强聚合物复合材料的制造参数和组成特性，以满足强制性的设计要求。介绍了一种聚合物基复合材料中短切纤维性能虚拟仿真的计算方法。这种新方法确实导致了一种专门的复合材料系统的多尺度材料表征的发展，该系统包括：a）基于Eshelby和Mori Tanaka失效理论的短切纤维，B）微观-宏观力学和损伤失效理论，c）张量刚度平均技术;以及d）作为耐久性分析软件GENOA的一部分的优化器。在MCQ-Chopped中建立的材料模型用于与GENOA多尺度渐进失效分析（MS-PFA）的FEA接口。使用GENOA软件在3个不同的集成步骤中对复合材料破碎管的破碎建模进行了测试验证，例如：a）使用MCQ-Chopped表征由短切纤维组成的复合材料的材料特性，并根据丰田试样测试数据进行验证; B）映射和转换-将统计平均张量方向从非结构化Moldex 3D详细模型转换为LS-DYNA FE求解器。在这方面，GENOA平台软件算法用于执行3D模型数据管理并可视化两个不同网格之间的映射误差;以及c）丰田的去均匀化多尺度渐进失效动态分析（MS-PFDA）提供了管结构的3D模型。采用MS-PFDA-LS-DYNA抗压强度分析方法对材料的损伤和断裂过程进行了预测。将仿真结果与丰田试验提供的载荷-位移曲线和加速度-时间曲线进行了比较。此外，软件预测提供了损伤和断裂的演变和贡献的失效机制。
Chopped fibers reinforced polymer composites are considered for use in many automotive applications. Commonly used structural design software have difficulties predicting manufacturing parameters and constituent properties of short or long fiber reinforced polymer composites to meet mandated design requirements. A computational method is introduced for the virtual simulation of performance of chopped fibers in polymer composites. This new approach did lead to the development of a specialized Multi-Scale Material Characterization of composite system comprising of: a) chopped fiber based on Eshelby and Mori Tanaka failure theory, b) micro-macro mechanics, and damage failure theory, c) tensor stiffness averaging technique; and d) optimizer as part of the durability analysis software GENOA. The material model established in MCQ-Chopped is used in FEA interface with GENOA Multi Scale Progressive Failure Analysis (MS-PFA). The crush modeling of composite crushed tube was test validated using GENOA software in 3 distinct integrated steps, such as follows: a) Characterizing Material Properties of composite materials composed of chopped fibers using MCQ-Chopped and validating against Toyota coupon test data; b) Mapping and Transformation - of statistical average tensor orientation from unstructured Moldex3D detailed model to LS-DYNA FE solver. In this regard GENOA platform software algorithm was used to perform 3D models data management and visualize the mapping error between two dissimilar meshes; and c) De-Homogenized Multi-Scale Progressive Failure Dynamic Analysis (MS-PFDA) - of Toyota provided 3D model of tube structure. MS-PFDA-LS-DYNA Crush worthiness analysis was performed to predict the damage and fracture evolution process. The simulation results were compared with Toyota test provided load vs. displacement and acceleration vs. time curve. In addition the software prediction provided the damage and fracture evolution and the contributing failure mechanism.