Stress Analysis Of Flat Extrusion Container For Aluminum Wall-plate By Photoelastic And FEA Method

Flat container is the most important tool for extruding large thin-wall Aluminum wainscot. Compared with the circle one, the flat extruding container that can improve the products' quality has better extruding property. Due to special shape of the flat container's cavity, it is very difficult to acquire the theoretical result for its working stress. In this paper, the hybrid method of three dimensional photoelasticity and FEM is used to analyze the stress fields of both the integral and the double-layer flat containers that are merely under the extruding pressure and merely under the assembling pressure respectively.The precise-casting method is used to make both the integral and the composite epoxy resin models, through which the cavities are formed at one time. The experiment simulates the extruding process with the flexible epoxy resin as the extruded materials; the assembling circumferences of the composite die are processed precisely by mechanical method, after which the inner and outer parts are assembled together. Both the integral and the composite dies are frozen up at 120 C during they are loaded. The stress distribution along the inner surface of the integral model, as well as the assembling circumference, the longitudinal axis and the sections of the composite model are derived.FEM is applied to analyze the same model that the experimental results have been used as the stress boundary condition. The numerical and experimental results are quite coincidental to each other.Meanwhile, by using reasonable procedure of processing image, MATLAB and C program are used to extract the skeleton of the isochromatic and isoclinic fringes of the photoelasticity. This method has greatly improved precision and velocity of the photoelastical image processing.