Study on the influence of riveting sequence on the failure of Multi-Rivet Thin-Walled structures

Research on the mechanical performance of repaired riveted joints in military aircraft remains limited, particularly for multi-rivet configurations. This study investigates the tensile behavior and failure mechanisms of multi-rivet joints. Results indicate that stress and strain were concentrated near the central axis during tensile loading, with buckling occurring at strain levels between 49% and 55%. The failure sequence typically involves initial shear failure of the patch around the bottom rivet, followed by fracture of the base aluminum sheet, and subsequent shear failure of the patches surrounding the side rivets. Residual stresses introduced during the riveting process significantly affect tensile performance; notably, the distribution pattern exerts a more critical influence than stress magnitude by altering fracture timing and load distribution. Among the three riveting sequences analyzed, the diffusely symmetric riveting configuration demonstrates the best tensile performance, achieving a maximum tensile load approximately 9.5% higher than that of the star-symmetric arrangement, while also avoiding misalignment between the base material and the patch.