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Kinetic analysis of self-piercing rivet head

Author: DongBiao
Tutor: HeXiaoCong
School: Kunming University of Science and Technology
Course: Mechanical Manufacturing and Automation
Keywords: Self-piercing riveting Kinetic analysis ANSYS / LS-DYNA FEM Plate connection
CLC: TH131.1
Type: Master's thesis
Year: 2011
Downloads: 48
Quote: 0
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Abstract


Self-pierce riveting technology is a cold-molding technology, which consists of hollow rivets punch will pierce the upper pressure plate on the bottom plate deformation in trumpet-shaped opening in the formation of two layers of plywood board or mechanical interlock. Although self-pierce riveting is a new sheet connection technology, but its mechanical properties than conventional spot welding is good. Self-pierce riveting technology has been in the automotive industry has been widely used, so aroused widespread interest in other industrial fields. Self-pierce riveting technology known as the next generation of connectivity technology that is lightweight vehicles is a key technology in the process. Finite Element Method and computer technology for the study of its molding process and parameter optimization to help reduce the research costs. To better understand the self-pierce riveting head molding process and to optimize the parameters of the process, this thesis numerical and experimental methods to study the self-piercing riveting head molding processes. Dynamics software LS-DYNA with Cowper-Symonds material model based on established 2D axisymmetric model, using Lagrange method and r-adaptive meshing technique to simulate the entire molding process. Binding experiments force - displacement curve and fittings profiles validate simulation is reasonable. Analysis of the friction coefficient, the process of molding time, the plastic strain ratio, adaptive meshing interval molding parameters such as the impact on the friction coefficient of a direct impact on the quality of self-piercing riveting molding. ANSYS finite element software with different elastic modulus and Poisson's ratio of different combinations and different elastic moduli combination with different densities conducted a modal analysis. Study of a single self-piercing riveting ride free vibration of the head, and found that the Poisson's ratio for the single-lap self-piercing rivet head almost no effect on the natural frequencies; self-piercing rivet head with the natural frequency of the elastic modulus increases with density increases. In modal analysis based on the analysis of the self-piercing rivet head Excitations external loading conditions and the impact load transient performance. Finally studied the self-piercing rivet head and self-pierce riveting - adhesive composite joints tensile shear tests to study its carrying capacity and failure modes. From the experimental results, there are two main failure modes: rivet head and pull from the bottom plate and the lower plate fracture. Purpose of this paper is to achieve self-pierce riveting process simulation and study dynamic performance self-piercing riveting head for deeper research foundation.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Mechanical parts and gear > Connection and connection parts > Rivet connection
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