Upscaling elastic interphases to canonical interface models

Javili A, Larsson F, Runesson K, Steinmann P (2026)

Publication Type: Journal article

Publication year: 2026

Journal

Computer Methods in Applied Mechanics and Engineering Elsevier

Book Volume: 451

Article Number: 118694

DOI: 10.1016/j.cma.2025.118694

Abstract

Finite-thickness interphases in heterogeneous materials are often idealized as zero-thickness interfaces in computational models. The interphase may be for instance the transition zone between inclusion and matrix in composites or the grain boundaries in polycrystalline solids. A more advanced application arises in the context of batteries, where the solid electrolyte interphase forms an electro-chemo-mechanically active layer surrounding the electrodes. For geometrically equivalent macro samples, due to increasing area-to-volume ratio with decreasing size, including interfaces introduces a length-scale into the effective response of heterogeneous materials. Recently, a canonical interface model was proposed by the authors that permits both displacement and stress discontinuities across the interface. Unlike the general interface model, this framework treats the interface displacement as an independent field with its own constitutive behavior. However, the associated interface parameters remain phenomenological to date. In this paper, we account for the microstructural features in a thin interphase zone and employ out-of-plane geometrical reduction together with variationally consistent InterPhase Homogenization (IPH) in order to derive the interface properties. In other words, phenomenological parameter values are replaced by “physics-based” values. In particular, it is possible to account for any complex micro-design within the interphase to bring about metamaterial characteristics upon upscaling. Numerical results showcase the upscaled response and highlight the significance of the microstructural design and constitutive relations of the interphase pertinent to a multiphase elastic solid.

Authors with CRIS profile

Paul Steinmann Lehrstuhl für Technische Mechanik (LTM)

Involved external institutions

Chalmers University of Technology / Chalmers tekniska högskola SE Sweden (SE) Bilkent University / Bilkent Üniversitesi TR Turkey (TR)

How to cite

APA:

Javili, A., Larsson, F., Runesson, K., & Steinmann, P. (2026). Upscaling elastic interphases to canonical interface models. Computer Methods in Applied Mechanics and Engineering, 451. https://doi.org/10.1016/j.cma.2025.118694

MLA:

Javili, Ali, et al. "Upscaling elastic interphases to canonical interface models." Computer Methods in Applied Mechanics and Engineering 451 (2026).

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