Orateur
Description
In this work, we propose a unified computational framework for large-strain dynamic contact in shape-memory-alloy (SMA) structures, with application to stent deployment in an artery-like environment. The model couples persistent unilateral contact and Coulomb friction at interfaces with finite-strain SMA inelastic transformations. A key feature is that both interface constraints and constitutive transformation conditions are written in a common KKT/NCP complementarity form. The resulting nonsmooth problem is solved by a single semi-smooth Newton– PDAS strategy, where Gauss-point active sets for SMA evolution are treated within the same loop as contact active sets. A midpoint time discretization is adopted to preserve robust transient behavior. The framework is assessed on academic superelastic and dynamic plasticity-type benchmarks, including exact-solution-oriented verification settings. It is then validated on a 2D stent–artery contact test under loading–unloading cycles with frictional interaction. Numerical results show competitive iteration counts versus radial-return-type updates.