On the Intrinsic Link between Gradient Strengthening and Passivation Onset in Single Crystal Plasticity
Abstract
A finite-deformation framework for gradient crystal plasticity is developed within a thermodynamically consistent setting grounded in Gurtin's power-conjugate formulation. The model introduces a flow rule that accounts explicitly for both energetic and dissipative microstress contributions. Numerical simulations are performed to investigate the response of single crystals subjected to passivation-type boundary constraints. The results reveal that constitutive laws capable of reproducing size-dependent strengthening at the onset of plastic flow simultaneously generate a pronounced, nearly elastic-type response when passivation is imposed. These findings establish a fundamental connection between gradient-induced yield strengthening and boundary-driven elevation of the mechanical response, highlighting the essential influence of dissipative gradient effects.
Keywords
Cite
@article{arxiv.2603.01532,
title = {On the Intrinsic Link between Gradient Strengthening and Passivation Onset in Single Crystal Plasticity},
author = {Habib Pouriayevali},
journal= {arXiv preprint arXiv:2603.01532},
year = {2026}
}