Study on Fatigue Behavior of Single-lap Self-piercing Riveted Joints of Aluminum and Copper Alloy Dissimilar Sheet Materials
This paper analyzed the features of self-piercing riveted(SPR) joints of aluminum and copper(aluminum-copper) alloy dissimilar sheet materials.The maximum load-displacement curves and maximum load-fatigue life(S-N) curves which characterize the behaviors of SPR joints were obtained respectively by the static test and fatigue test.The failure modes and fatigue limits with every stress ratio of the SPR joints were discussed.The process of crack initiation and crack propagation path were analyzed and explained in this paper.The type of fatigue crack propagation was defined and the relation between crack growth rates and amplitude of stress intensity factors(△K) were discussed from the fracture mechanics point.The fatigue crack propagation life of SPR joints of Aluminum-Copper alloy dissimilar sheet materials was calculated on the basic of the relation.To some extent,the research could provide some references for fatigue failure mechanism analysis of SPR joints.