平面编织复合材料胶螺混合连接接头拉伸性能分析

TENSILE PERFORMANCE ANALYSIS OF COMBINED ADHESIVE AND BOLTED JOINTS FOR PLAIN WOVEN COMPOSITES

对平面编织复合材料胶螺(单排螺钉)混合连接结构拉伸性能进行了试验研究,分析了螺钉直径为4 mm和6 mm两种情况下连接结构的破坏形式.基于ANSYS平台建立了胶螺混合连接三维损伤扩展模型,其中融入了非线性接触问题,数值计算的结果与试验结果吻合良好.研究发现,机械连接可以通过分担部分载荷而起着加强胶接连接的作用;如果机械连接工艺稳定的话,应该有螺钉直径越大,其加强效果越明显的规律;对于胶接与多钉混合连接复合材料结构的拉伸性能分析和计算确实存在很大困难,应该谨慎使用.研究结果与分析方法可以为今后的复合材料胶螺混合连接接头的设计提供一定的依据与技术支撑.

Experimental investigation was carried out on the tensile performance of combined adhesive- ly bonded and bolted （a single row） joints for woven composites. The failure forms of the joint were ana- lyzed with 4mm and 6mm diameter bolt hole respectively. A 3-D damage propagation model was established including non-linear touch problem to simulate the mechanical performance of the joints and the FEM re- suits matched well with the experimental results. It is shown that the adhesive joint can be reinforced with the load-sharing of mechanical joint. The larger the bolt diameter, the more effective is the reinforcement. The analysis of tensile properties of adhesively bonded joint with more than one row of bolts in mechanical joint poses great difficulty and more precautions must be taken for its application. The obtained results and the analysis method in this paper can provide some relevant reference and technological support for combined adhesive and bolted joint design.