Finite element analysis of metallic thin window: An iterative process

Thin windows are devices required by some particle accelerator physics experiments. These windows must be thin and light enough so they have a minimum effect on the beam. However, due to the boundary and loading conditions a window might observe; nonlinear structural behavior can occur from a number of different causes, such as geometric and material nonlinearities. If a structure experiences large plastic deformation, its changing geometric relationship can cause the structure to respond in a nonlinear manner. Material nonlinearities occur when the material's stress-strain relation depends on the load history as in plasticity models. The method of analysis for this study entails an FEA analysis, in which the stress and displacement are solved for a metallic membrane; these results are then compared to results obtained from an iterative process in relating the stress and strain with respect to the deformed geometry of the membrane. In addition, experimental tests will be carried out to determine the membrane displacement from a prescribed load. The study is conducted on 1145-O series Al.