Simulation modeling of rivet nut installation process and study of locking torque recession

Blind rivet nut is a new type of fastener, now widely used in the automotive, aviation and construction fields. In this paper, a 3D finite element numerical simulation model of the blind rivet nut installation and failure process is established with ABAQUS simulation software. Combined the simulation analysis as with the experimental research, the influence of the thickness of the rivet nut deformation zone on the fastener installation forming and closure process parameters on the locking torque were investigated respectively. The results show that the riveted structure has the highest axial pull-off force at a deformation zone thickness of 0.44 mm and is able to closely fit the connected parts. In addition, the use of a rectangular closure ensures that the riveted nut obtains a relatively uniform radial deformation and a sufficient locking torque. Furthermore, the decay of the locking torque was investigated and the decay of the rivet nut after repeated use was investigated. Carry out the influence of the rivet nut deformation zone thickness and the form of closure on the mechanical properties of the jointed, which has a certain reference significance for the design and manufacture of such fasteners.