Analysis of Fretting Wear of Type II Fastener Elastic Bar

The main function of fastener was achieved by elastic bar. The traditional method for the study of fatigue stress, strain analysis, which was not reflected the true situation, because the elastic bar in the work with other members of the contact surface between the mutual movement of tiny was created, i.e. fretting. The shear stress（ ）, relative displacement（ ） and two of the product（ ） of elastic bar was calculated out by applying Coulomb friction model of nonlinear contact theory of simulation of elastic bar and the surrounding contact element. Theoretical analysis was shown that, if the fretting wear in fatigue fracture was played a major role, it should be located in a section of the and of the value of the biggest point of attachment. Fastener fatigue tests was shown that, a fracture was found at the tail of elastic bar and baffle contact, which was between the value and value of the maximum point and closer to the value for maximum point. Crack was created because of fretting wear of tail of elastic bar and baffle, then the pollution source was formatted, and crack was propagated under the repeated effect, and the fracture of elastic bar was created eventually. The theoretical analysis of elastic bar of fretting wear was shown correctly by the fatigue test, and the improved design of elastic bar for a improving fatigue life was provided scientifly.