Risk-based design of marine pressure hulls require computationally efficient and precise models predicting collapse pressures ring stiffened cylindrical shells as a function realistic geometrical imperfections. However, the empirical interframe commonly implemented in codes do not explicitly depend on imperfections, existing analytical are only valid for axisymmetrically imperfect shells. The g...

We present rigorous simulations of EUV masks with technological imperfections like side-wall angles and corner roundings. We perform an optimization of two different geometrical parameters in order to fit the numerical results to results obtained from experimental scatterometry measurements. For the numerical simulations we use an adaptive finite element approach on irregular meshes. This gives...

The present study aims to investigate the effect of weld geometry and geometrical shape imperfections on mechanical behavior welded joints under different post-weld heat treatment conditions. Finite element analyses were performed using local properties laser beam AA2198 obtained from micro-flat tensile test specimens. finite results show that, for as-welded condition that maximum strain was ob...