Accurate mathematical modeling and experimental verification of impact riveting

Abstract

Besides the driven head, the rivet shank expansion is one key product characteristic of riveted joint. The paper studies accurate mathematical modeling of pneumatic percussive riveting based on impacting dynamics. The pneumatic percussive riveting hammer and rivet are modelled as the piston-striker-rivet impacting system. Based on the proposed pressure bar impacting model, the numerical model of the pneumatic percussive riveting is constructed in the ABAQUS. The rivet’s dynamic behavior under high strain rate and the percussive squeezing forces are studied intensively. A pneumatic percussive riveting platform is constructed to gather the percussive squeezing force during the course of pneumatic percussive riveting experiments. The riveted plates and the gathered percussive squeezing forces are considered to validate the proposed numerical model. The experimental results show that the proposed numerical model predicts the pneumatic percussive riveting well. The proposed impacting model successfully modelled the percussive riveting process of the pneumatic hammer.