Experimental and Numerical Determination of the Local Fiber Volume Content of Unidirectional Non-Crimp Fabrics with Forming Effects
Experimental and Numerical Determination of the Local Fiber Volume Content of Unidirectional Non-Crimp Fabrics with Forming Effects
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DOI：
10.3390/jcs3010019
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发表时间：
2019-03-01
影响因子：
3.3
通讯作者：
Gude, Maik
中科院分区：
文献类型：
--
作者：
Galkin, Siegfried;Kunze, Eckart;Gude, Maik
对复合材料部件内部局部纤维取向和局部纤维体积含量的详细了解，为更可靠地预测结构行为提供了机会。利用干燥或预浸渍织物的成形模拟方法可以预测局部纤维取向。此外，在成形过程中，所谓的悬垂效应，如波纹、间隙或剪切引起的横向压缩，改变了局部纤维的体积含量。为了重现和研究这种悬垂效果，在这项工作中开发了不同的制造工具。这些工具用于创建具有预定义变形状态的织物样品，代表不同的悬垂效果。根据所得纤维体积含量对样品进行评估。实验结果与解析解的预测结果和基于悬垂模拟结果的数值解的预测结果进行了比较。此外，还讨论了任意应变状态下悬垂效应的相互作用对纤维体积含量的影响。
Detailed knowledge of the local fiber orientation and the local fiber volume content within composite parts provides an opportunity to predict the structural behavior more reliably. Utilizing forming simulation methods of dry or pre-impregnated fabrics allows for predicting the local fiber orientation. Additionally, during the forming process, so-called draping effects like waviness, gapping or shear-induced transverse compression change the local fiber volume content. To reproduce and investigate such draping effects, different manufacturing tools have been developed in this work. The tools are used to create fabric samples with pre-defined deformation states, representing the different draping effects. The samples are evaluated regarding the resulting fiber volume content. The experimental results are compared with the predictions of an analytical solution and of a numerical solution based on draping simulation results. Furthermore, the interaction of the draping effects at arbitrary strain states is discussed regarding the resulting fiber volume content.