Optimization design of joint under fatigue life

The joint is the common bearing structure in the aircraft,but it's also a common source of fatigue.The pin load on the fasteners and the bypass load on the side of hole directly affect the fatigue life.The fasteners and plate connection relationship simulated by the bush element,beam element and rbar element in the article.Established the joint detail finite element model.thickness of connecting plate shape steps,Which can reduce the stress concentration of the end hole.And calculate the load distribution.Then determine the serious hole in the various joints,by Stress Severity Factor approach.Finally the fatigue life of various serious holes were compared,the calculation results show that accords with the theory,the optimization of structure design has reference value.