Discovering Thermodynamically Admissible Dissipation Potentials via Grammar-Based Symbolic Regression

• URL: http://arxiv.org/abs/2605.31532v1
• Date: Fri, 29 May 2026 16:45:51 GMT
• Title: Discovering Thermodynamically Admissible Dissipation Potentials via Grammar-Based Symbolic Regression
• Abstract summary: Constitutive laws for inelastic materials must satisfy strict thermodynamic admissibility requirements.<n>We propose a symbolic regression framework for the data-driven discovery of dissipation potentials.<n>The framework is validated on synthetic datasets spanning Newtonian, power-law, and Bingham viscoplastic ground truths.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Constitutive laws for inelastic materials must satisfy strict thermodynamic admissibility requirements, yet current data-driven approaches sacrifice interpretability, even when formal guarantees are provided by physics-encoded architectures. We propose a symbolic regression framework for the data-driven discovery of dissipation potentials governing the evolution of internal variables within the Generalized Standard Materials (GSM) formalism. Starting from the Clausius--Duhem inequality, we enforce the thermodynamic requirements, convexity and non-negativity, that the dual dissipation potential must satisfy to guarantee non-negative mechanical dissipation. These requirements are formulated in the general subdifferential setting, encompassing rate-dependent (viscoelastic) and viscoplastic dissipative mechanisms, including potentials with genuine elastic domains, within a unified framework. Candidate potentials are generated by a composition-extended convexity-preserving grammar that guarantees thermodynamic admissibility \emph{by construction}. The framework is validated on synthetic datasets spanning Newtonian, power-law, and Bingham viscoplastic ground truths under process and measurement noise, and on experimental oscillatory shear measurements of a synthetic elastomer across multiple strain amplitudes and frequencies, where the discovered potentials reproduce the amplitude-dependent softening of the dynamic moduli and outperform a calibrated linear Zener baseline.

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