Low Cycle Repetitive Loading of Ti‐6Al‐4V‐Epoxy Composite Lattice Structures for Enhanced Energy Dissipation and Damage Tolerance

Composite lattice structures are emerging as a promising class of architected materials for energy absorption and failure mitigation under cyclic loading. This study explores the low cycle repetitive loading behavior of Ti‐6Al‐4V metallic lattices infiltrated with high‐strength epoxy, focusing on the influence of lattice volume fraction on mechanical performance and energy dissipation. Lattice geometries were manufactured using laser‐beam powder bed fusion and tested at volume fractions from 5%–20%. Uniaxial cyclic compression testing revealed that composite lattices with 10% lattice volume fraction exhibited synergistic enhancements in elastic modulus up to 29% and specific energy dissipation up to 433%. In contrast, high‐volume fraction composites showed reduced performance, attributed to stress concentrations and diminished matrix effectiveness. Digital image correlation and numerical modeling provided insights into the evolving strain fields and load distribution across phases, confirming that epoxy reinforcement shifts deformation from bending‐dominated to stretching‐dominated behavior in the lattice. Notably, composite lattices retained their stiffness and energy dissipation capacity across cycles far better than metallic lattices alone, highlighting their resilience under repeated loading. These findings provide a framework for balancing constituent proportions of materials in composite lattices to derive enhanced energy dissipation properties appealing to engineering industries.