Existence of quasi-static crack evolution for atomistic systems

Abstract

We consider atomistic systems consisting of interacting particles arranged in atomic lattices whose quasi-static evolution is driven by time-dependent boundary conditions. The interaction of the particles is modeled by classical interaction potentials where we implement a suitable irreversibility condition modeling the breaking of atomic bonding. This leads to a delay differential equation depending on the complete history of the deformation at previous times. We prove existence of solutions and provide numerical tests for the prediction of quasi-static crack growth in particle systems.

Keywords

• Atomistic systems
• Delay differential equations
• Minimizing movements
• Quasi-static crack growth
• Irreversibility condition