A finite element optimization technique to determine critical imperfections of shell structures

摘要: Geometric imperfections play a significant role in the evaluation of buckling capacity thin-walled structures. Since pattern and distribution such take random variation, determination critical imperfect shape that leads to minimum load becomes challenge. In this study, an optimization technique based on binary coded genetic algorithms is used together with nonlinear finite element model identify imperfection for welded The consistent sub-parametric shell accounts effect both geometric material nonlinearities. algorithm as means arrive at leading near globally load. A previously developed mathematical employed describe bulges associated lines weldment. method demonstrated by considering stability analysis circular cylinder subjected pure axial compressive conical tank under hydrostatic pressure. combined – code determine bulge patterns two problems, well their loads.