Buckling of thick elasto-visco-plastic egg shells under external pressure: Experiments and bifurcation analysis

The buckling of rate dependent structures is not a topic often discussed in the literature. Methods to predict such exist, but only few experimental works have been published, and even less when considering thick shell structures. In this work we are interested elasto-visco-plastic hemi-egg shells. We follow modelling/experimental approach analyse problem. Buckling experiments at room temperature on shells subjected external pressure performed. 3D digital image correlation used measure displacement fields inner surface during experiments. Due specimen shape their loading, they experience non-proportional load paths. effect path behaviour has already many times literature for elasto-plastic materials. This also intends assess point material. A prediction model couples Bodner’s with deformation theory. It estimate critical modes based preliminary finite element analysis. effects geometrical loading imperfections discussed. Finally, results compared predictions. good observed between numerical