中文摘要：

为解决由于螺栓和复合材料板制孔制造过程中不可避免的制造公差引起的配合间隙的不同,而使复合材料螺栓连接钉载分配不同,从而导致螺栓连接强度分散性的问题,以英制高锁螺栓和孔板制孔的制造公差为例,研究不同配合间隙下双剪四钉螺栓连接钉载分配情况,并进一步采用改进的特征曲线法、改进的强度包线法和渐进损伤模型对螺栓连接结构的强度进行预测,得到四钉连接失效强度的分散区间分别为[-3.87％,2.16％]、[-4.01％,3.95％]和[-3.16％,5.14％].结果说明如果紧固件及螺栓孔均符合制造标准,则其对强度的影响范围不超过6％.

英文摘要：

The manufacturing tolerance, which leads to different fit clearances between bolts and composite plate holes, is ineluctable in the manufacture process. Thus diversified pin load distribution of composite bolted joint is present and further results in the strength scatter of the joints. Taking a double-lap four-bolt composite joint with high locked bolts as an example, the influence of the fit clearance on the pin load distribution was investigated by a clearance-based direct stiffness method. Furthermore, the strength scatters of the four-bolt joint stemmed from the manufacturing tolerance have been predicted by a modified characteristic curve method, a modified strength envelope method and a progressive damage model with the dispersion intervals being [-3. 87%, 2. 16%], [-4. 01%, 3.95%] and [-3.16%, 5.14%], respectively, which shows the effect range of the manufacturing tolerance on the strength of the joint is less than 6 %, if the fasteners and holes both meet the manufacturing criterion.