碳纤维/树脂复合材料多钉连接钉载系数测试方法

为解决由于碳纤维/树脂复合材料多钉连接结构中钉载分配状态和测试方法不同导致的钉载系数测试分散性不明确的问题，针对应变片和钉载矢量传感器两种测试方法，提出基于不确定度理论的钉载系数相对测量不确定度的计算模型，并计算两种测试方法对碳纤维X850/树脂复合材料单剪、双剪连接结构钉载系数的相对测量不确定度。结果表明，应变片测试方法中，单剪结构钉载系数无法准确测量，双剪结构钉载系数相对测量不确定度通常超过2.8%，且随结构中螺栓数目和应变片贴片角度偏差的增加而增大；钉载矢量传感器测试方法中，单剪、双剪结构钉载系数均可测试，且针对任意螺栓数目结构，其钉载系数相对测量不确定度最大不超过1.5%。 

Testing method of bolt load distribution in carbon fiber/resin composite multi-bolt joints

A calculation model based on uncertainty theory for relative uncertainty of bolt load distribution in carbon fiber X850/resin composite multi-bolt joints was proposed for the existing problem of indeterminate testing deviation of bolt load distribution. This problem was caused because of the different testing methods and bolt load distributions of composite joints in different testing processes, so both the widely used strain gauge method and the latest instrumented bolt method were investigated. The research shows that the bolt load distribution in single-lap joints cannot be tested by the strain gauge method, and the relative uncertainty of double-lap joints is more than 2.8% in usual and will increase with the increasing of the number of bolts and the sticking deviation angle of strain gauges. The relative uncertainty of both single-lap and double-lap joints is no more than 1.5% with arbitrary number of bolts in the instrumented bolt method.