Dual-material TPMS metamaterial with High Load-bearing Capacity and Performance Stability

Attaining both high load-bearing capacity and excellent performance stability is a crucial requirement for most structural materials. Unfortunately, these two properties are generally difficult to implement simultaneously. This work presents a design approach that incorporates the dual-phase design principle into Triply Periodic Minimal Surface (TPMS) metamaterial, aiming to provide valuable insights into resolving the intrinsic conflict between high load-bearing capacity and excellent performance stability. Quasi-static compression and three-point bending tests demonstrate that the dual-material design enhances both load-bearing capacity and performance stability by integrating and complementing the advantages of the two constituent materials. Furthermore, by compromising and controlling the relative proportions of the two materials, the dual-material configuration can be further optimized to achieve improved lightweight load-bearing performance while maintaining acceptable stability. Compared to the original dual-material configurations, the optimized design can achieve 76.64% and 45.04% improvements in specific Young’s modulus and SEA, respectively. Our work promotes the innovative development of design strategies for next-generation metamaterials with both high load-bearing capacity and excellent performance stability.