Analytical models for characterizing coupling effects of loading state and loading rate on ultimate strength and yield strength of riveted joints

An electromagnetic split Hopkinson tensile bar system was employed to determine the dynamic mechanical behaviors of riveted joints under different shear/tension combinations. Combining with results obtained from quasi-static tests, the effects of loading state and loading rate on both ultimate strength and yield strength of riveted joints are analyzed. An obvious elevation for the levels of yield force and ultimate force when increasing the loading speed is observed, meanwhile, such strengthening effects are sensitive to the loading state. On the basis of detailed load analysis, two analytical models considering both the loading rate effect and loading state effect were proposed to predict the ultimate strength and yield strength under different loading conditions. The theoretical calculations by applying such two analytical models agree well with the experimental results under five different loading states over a wide range of loading speeds (5 x 10(-6) m/s similar to 17 m/s), indicating the coupling effect of loading angle and loading speed on both ultimate strength and yield strength of riveted joint is reasonable defined.