复合材料结构用高锁螺栓的动态复合加载失效特性

为研究复合材料结构用高锁螺栓的动态复合加载失效特性，基于高速液压伺服材料实验机设计专用的实验支持装置，提出碰撞式实验加载方法。实现中国商用飞机有限责任公司紧固件工艺标准CFBL1001-6-6/CFNT1003CY6抗剪型高锁螺栓在0.01 m/s、0.10 m/s、1.00 m/s加载速度及纯拉伸、30°拉伸-剪切耦合、45°拉伸-剪切耦合、60°拉伸-剪切耦合、纯剪切状态下的失效测试，并基于实验结果拟合得到高锁螺栓的失效参数。结果表明：提出的测试方法能够有效获取高锁螺栓的动态失效参数;CFBL1001-6-6/CFNT1003CY6高锁螺栓的失效模式和失效载荷受加载方式影响较大,受加载速度影响较小;拟合获得的失效方程可较好地表征高锁螺栓的失效特性。

Failure Characteristics of High-lock Bolts for Composite Structures under Dynamic Combined Loading

In order to study the failure characteristics of high-lock bolts used in composite structures under dynamic combined loading, a special experimental support device is designed based on the high velocity hydraulic servo-testing machine, and a loading method of collision type is proposed. Failure tests of CFBL1001-6-6/ CFNT1003CY6 high-lock bolts were conducted under the conditions of 0.01 m/s, 0.10 m/s and 1.00 m/s loading speeds, and pure tensile, 30° tensile-shear coupling, 45° tensile-shear coupling, 60° tensile-shear coupling and pure shear state, and the parameters of failure equation were obtained by fitting the experimental results. The experimental results show that the failure parameters of high-lock bolts under dynamic combined loading can be effectively obtained by using the proposed experimental method, and the failure mode and failure load of high-lock bolts are affected greatly by the loading mode and less at the loading speed.The experimental results are good agreement with the predicted results of failure equation, which indicates that the failure characteristics of high-lock bolts can be well represented by the failure equation.