3D机织复合材料多向接头有限元分析

Finite element analysis of 3D woven composites multidirectional joint

为了探究3D机织复合材料桁架接头的机械性能,采用有限元软件ANSYS对3D机织复合材料多向接头所在桁架总体进行有限元模拟,模拟中根据纤维走向对多向接头不同轴向圆管建立相应坐标系,并赋予材料属性,使用MPC多点约束法施加载荷.求解分析后结果表明:模拟结果与实测结果中最大应变的位置与数值基本吻合,确定了模拟的有效性;将最大应力与破坏应力对比发现接头在当前载荷下可能发生轻微破坏,破坏位置应位于副管顶部;通过模拟判断了实测中发生轻微响声的原因;将4种角联锁结构的多向接头模拟结果对比发现,带有衬经结构的复合材料为多向接头最佳材料.此次模拟补充了实测中无法得到的数据,为接头的优化设计和实际使用提供一定的帮助.

The finite element simulation of 3D woven composites multidirectional joint truss was performed using commercial ANSYS software, aiming to evaluate its mechanical properties. The simulation of different axial tubes of the multidirectional connector has its own coordinate system, which is established based on fiber direction. Main loading that the joints might suffer was ascertained, in order to simulate the real stress state. The MPC multi-point constraint method was used to apply load. The validity of analysis results were verified by comparison with the test data. The maximum strain＇s position of analysis results was basically consistent with the measured results, suggesting the validity of simulation. Comparison of the maximum stress with failure stress indicates that under the current load, the joints may be damaged, and the damage location should be located in the top of the vice tube. The reasons for slight sound during the testing were determined through simulation. By the comparison of four different angular interlock joints, it was shown that the optimum material is the one with warp-stuffer. The method and results can provide reference for＂ the design of joint and will benefit the practical application.