Experimental and numerical investigation of the needling process for quartz fibers
Experimental and numerical investigation of the needling process for quartz fibers
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DOI：
10.1016/j.compscitech.2018.06.009
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发表时间：
2018-09
影响因子：
9.1
通讯作者：
Xie Junbo-;Chen Xiaoming-;Zhang Yifan;G. Fang;Chen Li
中科院分区：
文献类型：
--
作者：
Xie Junbo-;Chen Xiaoming-;Zhang Yifan;G. Fang;Chen Li
本文研究了石英预制棒在针刺过程中的变形和损伤。实验研究了针刺部位和织物厚度对针头阻力的影响。提出了一种基于虚拟纤维概念的数值方法来建立二维斜纹织物和非织造布的几何模型。然后，采用显式动力学算法，用有限元方法对织物的针刺过程进行了模拟。对纤维的变形、拉伸和断裂进行了分析。模拟的针刺部位的纤维结构与实际观察到的纤维结构比较接近。对针刺过程中的阻力进行了预测，结果令人满意。该方法的目的是生成针刺预制棒的虚拟纤维结构，并获得针刺工艺对纤维损伤的影响。这种方法将有助于设计低损伤预制件，提高针刺复合材料的力学性能。
This paper investigates the deformation and damage of quartz preforms during the needling process. Effect of needling position and fabric thickness on the resistance force of the needle are experimentally researched. A numerical methodology based on the concept of virtual fibers is proposed to establish the geometry models of 2D broken twill and nonwoven fabrics. Then the needling process of the fabric plies is simulated by finite element method using an explicit dynamics algorithm. Deflection, stretch and breakage of the fibers are analyzed. The simulated fiber architectures of the needling positions are fairly close to the practical observations. Resistance force of the needling process can be predicted with satisfactory accuracy. The aim of the proposed approach is to generate the virtual fiber structure of needled preforms and obtain the effect of needling process on the fiber damage. This approach would be helpful for designing low-damage preforms and improve the mechanical properties of needled composites.