Non-uniform fibre distribution in composites caused by Z-pinning process
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摘要: 通过建立二维有限元模型, 研究了Z-pinning增强工艺过程中Pin针的嵌入对预成型件纤维变形区域的改变, 定量表征了工艺引起的基体富集区的形状和大小, 以及局部纤维方向变化和纤维含量非均匀分布的特征参数, 得到纤维非均匀分布的规律。在此基础上, 模拟了不同直径的Pin针对层合板面内微观结构的影响规律。结果表明: Pin针直径的改变对基体富集区的影响较大; 局部纤维偏转角和纤维体积含量随着Pin针直径的增大而增大, 但其最大值变化不明显。Abstract: Based on the 2D finite element model, changes of the fibre distortion region in the preform were investigated during the Z-pinning process. The shape and size of the resin zone were quantitatively characterized. Characteristic parameters of the fibre misalignment angle and the non-uniform distribution of local fibre content were made, and the rule of the fibre non-uniform distribution was obtained. On this basis, influence of the Pin diameter on the microstructure of the laminates was numerically analyzed. The results show that the Pin diameter has a great impact on the resin rich zone. The misalignment angle and fibre volume fraction increase with the Pin diameter, however, the maximum does not change significantly.
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Key words:
- composite laminates /
- Z-pin /
- fibre distortion /
- finite element /
- resin-rich zone
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