Finite element models for clinching, push-out, and torque-out tests of self-clinching nuts

Abstract Self-clinching nuts are increasingly used in automotive industry for fastening bolts to metal sheets, which are too thin to be threaded directly. To ensure safe and reliable use, this type of nuts must meet defined mechanical performance criteria, such as push-out and torque-out resistance. Finite element analysis plays a crucial role in observing the deformation of the sheet metal during the clinching process and in assessing whether the nuts meet the expected performance standards. This study focused on the development of finite element models for clinching, push-out, and torque-out tests for self-clinching nuts. The accuracy of the developed models was evaluated by comparing their results with corresponding experimental data. The findings of the study revealed that mesh quality significantly affect the accuracy of the simulation results. Additionally, it was observed that the compliance of the testing machine plays an important role in the discrepancy between experimental and simulation outcomes during the clinching process.