Distinct regimes of mechanical reinforcement in lattice network-based interpenetrating phase composites

Authors

Ehsanul Azim, The University of Texas Rio Grande Valley
Mohammad R. Islam, The University of Texas Rio Grande ValleyFollow

Document Type

Article

Publication Date

5-2026

Abstract

Interpenetrating phase composites with lattice network-based reinforcement phases are promising candidates for lightweight structural applications. While a variety of IPCs have been developed using different lattice network topologies and matrix types, not all combinations lead to desired reinforcement. There is a lack of understanding of how to select a network topology and matrix properties to achieve a targeted reinforcement. This study investigates the synergistic effects of lattice network and matrix properties on the IPC reinforcement using finite element simulations and theoretical scaling analysis. Three strut-based network topologies (cubic, body-centered, and octet) have been considered, while the bulk material properties of the matrix have been varied with respect to empty lattice networks. The elastic modulus, yield strength, and post-yield softening of IPCs can be tuned by the modulus and strength ratios of the lattice network and matrix. It is observed that the scaling exponents of IPC gradually decrease with an increase in matrix stiffness and strength, suggesting a bending-to-stretching dominated deformation of struts. Two distinct regimes are observed: a weak reinforcement regime in which the IPC reinforcement only depends on the lattice network, and a strong reinforcement regime controlled by both lattice network and matrix. Two master curves have been developed based on two non-dimensional parameters that define to which regime a given IPC belongs and the associated reinforcement as a function of lattice network geometry and the bulk material properties of the matrix.

Comments

Original published version available at https://doi.org/10.1016/j.mechmat.2026.105640

Recommended Citation

Azim, Ehsanul, and Mohammad R. Islam. 2026. “Distinct Regimes of Mechanical Reinforcement in Lattice Network-Based Interpenetrating Phase Composites.” Mechanics of Materials 216: 105640. https://doi.org/10.1016/j.mechmat.2026.105640.

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.

Publication Title

Mechanics of Materials

DOI

10.1016/j.mechmat.2026.105640