Surface accretion of a pre-stretched half-space: Biot's problem revisited

Motivated by experiments on dendritic actin networks exhibiting surface growth, we address the problem of the stability of this growth process. We choose as a simple, reference geometry a biaxially stressed half-space growing at its boundary. The actin network is modeled as a neo-Hookean material. A kinetic relation between growth velocity and a stress-dependent driving force for growth is utilized. The stability problem is formulated and results are discussed for different loading and boundary conditions, with and without surface tension. Connections are drawn with Biot's 1963 surface instability threshold.

Automated summary

Motivated by experiments on dendritic actin networks exhibiting surface growth, this study investigates the stability of the growth process. A biaxially stressed half-space growing at its boundary is chosen as the reference geometry, and the actin network is modeled as a neo-Hookean material. The kinetic relation between growth velocity and stress-dependent driving force is utilized. The stability problem is formulated and discussed under different loading and boundary conditions, with and without surface tension, with connections made to Biot's 1963 surface instability threshold.