Dehydration-induced mechanical instabilities in active elastic spherical shells

Active elastic instabilities are common phenomena in the natural world, where they have character of sudden mechanical morphings. Frequently, driving force instability mechanisms has a chemo-mechanical nature, which makes very different from standard instabilities. In this paper, we describe and study active occurring swollen spherical closed shell, confining water-filled cavity, during dehydration process. We set up few numerical experiments based on stress-diffusion model to give an insight into phenomenon. Then, present that looks at problem and, through simplifying assumptions, allows us derive semi-analytical It takes account both stress state water concentration walls shell onset instability. Moreover, it considers invariance cavity volume instability, is due impossibility instantaneously changing filled with water. Eventually, shown semi-analytic matches well outcomes far initial regime; ranges validity approximated analytical also discussed.