Fatigue Analysis and Experimental Study of Aluminum Alloy No-rivet Clinch Connections Based on Equivalent Structural Stress Method
The aluminum alloy no-rivet clinch connection was used as research object.By testing tensile strength and fatigue mechanical properties of three group lapped specimens with unequal thick-ness,the fatigue fracture behavior of aluminum alloy no-rivet clinch connection were studied and the load force-life(F-N)distribution of specimens was obtained.According to specimen fatigue test condi-tions,the equivalent FEA model was established to calculate equivalent structural stress amplitudes(ΔSs),Weibull analysis was carried out on the measured fatigue life scatter data and key parameters of master ΔSs-N(S-N)curve for no-rivet clinch connections were obtained by fitting with the least square method.The fitted master S-N fatigue life curve was applied to predict fatigue damage of no-rivet clinch connections when the all-aluminum hood of pure electric vehicle experiencing dynamic closing load case.Research results suggeste that:the fatigue cracking of no-rivet clinch connections occur at necking position and ΔSs-N curve satisfy power function relation.By optimizing the point number and positon of no-rivet clinch connections,the maximum damage of no-rivet clinch connec-tions in the key area of all-aluminum alloy hoods was reduced from 1.08 to 0.78,which satisfice hood dynamic closing durability performance design requirements of pure electric vehicles.The developed calculation method and master S-N curve parameters may provide a theoretical basis for the fatigue simulation and optimization of no-rivet clinch connections on vehicle bodies.
all-aluminum alloy hoodno-rivet clinch connectionequivalent structural stressfi-nite element analysis(FEA)fatigue test
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