Effect of bolt tightening torque on fatigue life of multi-bolted composite structure

Bolt tightening torque has an influence on the fatigue life of multi-bolted joints which cannot be ignored, but there are few methods to predict composite structure by considering bolt torque. A prediction method is proposed. It can take into account various damages bolts and laminates accurately calculate damage evolution structure. The being composed T300/BMP-316 TC4 titanium alloy used verify present method. logarithmic error between predicted experimental 4.36%, failure mode consistent with experimental. Through method, explored, in it found that increasing torque, increases firstly decreases, optimal By observing diagram, when below propagation effectively restrained, will lead reduction life. On contrary, more than cause initial test piece, also In engineering, choose best for assembly improve