arXiv:2611.09492v1 Announce Type: new Abstract: We investigate the mathematical and computational aspects of the logarithmic strain space framework for finite-strain models in nonlinear continuum mechanics, focusing on the classical von Mises elastoplastic model with linear kinematic hardening. To overcome the lack of coercivity and lower-semicontinuity in the quadratic Hencky energy, we introduce higher-gradient regularization and prove the existence of energetic solutions for rate-independent quasistatic evolution under time-dependent Dirichlet loading. Complementarily, we develop a vectorized MATLAB finite-element implementation of the framework leveraging page-wise matrix functions and operations, and our custom vectorization library. Computational benchmarks show that local tensor operations are significantly accelerated, the logarithmic-strain approach does not substantially increase computational costs, and the implementation robustly handles large rotations and deformations.