Numerical Simulation Analysis Of Interface Characteristic And Forming Performance For Galvanized Sheet

As a sort of further processed product, hot dip galvanized sheet d has extensive application foreground with the advantage of strong corrosion resistance, long life, beautiful appearance. With the progress of science and technology, more research is been carried on. A great deal of research is mostly on preparation and use previously, however a lot of matters need further be studied, especially in the metal sheet process and forming. Based on mentioned above, the paper has researched forming properties of sheet steel with zinc coat at both ways of theory and numerical simulation under deep-drawing.The main results are as follows:Firstly, by utilizing the theory of metal sheet plastic forming, analytical process of galvanized sheet metal forming was elaborated and discussed. In corporation the Mises yield criterion, the drawing mechanical model based on double friction coefficient is established. The geometric relationship of sheet drawing and the stress-strain relationship between the coating and the substrate are deduced. The stress condition of flange deformation region, die fillet region, cup wall region and punch fillet region are discussed in the course of sheet forming .And punch forces with different metal sheet thickness and different zinc coat thickness are compared and analyzed.Secondly, a two-dimensional axisymmetric finite element model of galvanized sheet metal forming has been established by using the dynamic explicit algorithm. Stress change at the interface has mainly analyzed and the influences of the stress on the bonding strength at the interface are studied in the galvanized sheet process and forming . And the region in which interface failure will be likely to happen is predicted.A three-dimensional finite element model of galvanized sheet metal has been established by using the dynamic explicit algorithm. The process of galvanized sheet metal forming is simulated, and all kinds of key technique are analyzed. Some simulated experiments by adopting different binding force are performed, the optimal bonding strength at the interface is obtained. The change of stress and thickness in sheet steel with zinc coat is quantity calculated. The simulated results compared with theoretical analysis indicate that the way of the simulation is feasible, and the result has certain guiding function for prodution.