Stress-adaptive femur bionic triple periodic minimal heterostructures manufactured by SLS technology with excellent mechanical properties

Abstract

Inspired by the morphology and material distribution characteristics of femoral trabecular bone, four types of biomimetic triply periodic minimal surface (TPMS) heterogeneous structures were designed. Biomimetic samples were fabricated using selective laser sintering technology for quasi-static compression and impact testing. A comparative study of the planar compression performance and impact resistance of the biomimetic TPMS heterogeneous structures was conducted. The results showed that the heterogeneous component composition improved the strength performance of the original structure by over 25 %, and enhanced the overall energy absorption characteristics by more than 23.5 %. By leveraging the mechanical coupling properties of heterogeneous materials, the strength and energy absorption performance of the original structure were increased by over 20 %. Additionally, combining additive manufacturing technology, a novel stress-adaptive porous component design for practical engineering applications was developed. In conjunction with bicycle helmet design, the stress-adaptive component modeling method demonstrated excellent performance in modeling flexibility and mechanical strength. By reasonably combining different types of materials, the heterogeneity of materials can fully utilize their respective advantages and compensate for deficiencies, thereby creating materials with superior mechanical properties.