Direct Fiber Simulation of a Compression Molded Ribbed Structure Made of a Sheet Molding Compound with Randomly Oriented Carbon/Epoxy Prepreg Strands—A Comparison of Predicted Fiber Orientations with Computed Tomography Analyses
Direct Fiber Simulation of a Compression Molded Ribbed Structure Made of a Sheet Molding Compound with Randomly Oriented Carbon/Epoxy Prepreg Strands—A Comparison of Predicted Fiber Orientations with Computed Tomography Analyses
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由具有随机取向碳/环氧预浸料束的片状模塑料制成的压缩成型罗纹结构的直接纤维模拟——预测纤维取向与计算机断层扫描分析的比较
DOI：
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发表时间：
2020
影响因子：
3.3
通讯作者：
T. Osswald
中科院分区：
文献类型：
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作者：
J. Teuwsen;S. Hohn;T. Osswald
不连续纤维复合材料（DFC），如碳纤维片模复合材料（CF-SMC），在汽车工业中越来越多地用于制造轻量化零件。在复杂几何形状的压缩成型过程中，由于流动条件的影响，纤维取向会发生局部变化。了解这些过程诱导的纤维取向是正确设计零件的关键，因为最终零件的力学性能高度依赖于其局部微观结构。局部纤维取向可以通过微计算机断层扫描（µCT）和数字图像处理来测量和分析，或者通过过程模拟来预测。本文对采用剪切单向（UD）碳/环氧预浸料带50mm长随机定向链（ROS）的CF-SMC压缩成型的肋形帽形件进行了数值和实验对比分析。分析了三个完整的CF-SMC部件的x射线微CT扫描，将确定的取向张量与直接纤维模拟（DFS）工具的取向张量进行比较，该工具采用了一种新颖的链生成方法，逼真地模拟了初始ROS电荷介结构。DFS结果显示，预测的局部纤维取向与微CT测量结果总体上很吻合，因此是宝贵的信息，可用于后续的综合模拟，以确定机械载荷下零件的细观结构相关的各向异性行为。
Discontinuous fiber composites (DFC) such as carbon fiber sheet molding compounds (CF-SMC) are increasingly used in the automotive industry for manufacturing lightweight parts. Due to the flow conditions during compression molding of complex geometries, a locally varying fiber orientation evolves. Knowing these process-induced fiber orientations is key to a proper part design since the mechanical properties of the final part highly depend on its local microstructure. Local fiber orientations can be measured and analyzed by means of micro-computed tomography (µCT) and digital image processing, or predicted by process simulation. This paper presents a detailed comparison of numerical and experimental analyses of compression molded ribbed hat profile parts made of CF-SMC with 50 mm long randomly oriented strands (ROS) of chopped unidirectional (UD) carbon/epoxy prepreg tape. X-ray µCT scans of three entire CF-SMC parts are analyzed to compare determined orientation tensors with those coming from a direct fiber simulation (DFS) tool featuring a novel strand generation approach, realistically mimicking the initial ROS charge mesostructure. The DFS results show an overall good agreement of predicted local fiber orientations with µCT measurements, and are therefore precious information that can be used in subsequent integrative simulations to determine the part’s mesostructure-related anisotropic behavior under mechanical loads.
长纤维增强热塑性塑料压缩成型过程中纤维基体分离的实验和数值分析
影响因子：
3.3
作者：
Kuhn, Christoph;Walter, Ian;Taeger, Olaf;Osswald, Tim
通讯作者：
Osswald, Tim
使用直接纤维模拟模拟预测压缩成型过程中肋填充中的纤维基体分离
影响因子：
3.3
作者：
Kuhn, Christoph;Walter, Ian;Täger, Olaf;Osswald, Tim
通讯作者：
Osswald, Tim