Energy Absorption Capability of Graded Hybrid Triply Periodic Minimal Surface Structures Based on Fracture Zone Controlling

Abstract

A novel design strategy of the graded hybrid lattice structure is proposed by controlling fracture zone to improve the energy absorption capability of the structure. The Primitive (P) and iWP (W) structures are two kinds of TPMS structures with typical deformation and failure modes. Thus, taking the P structure (stretching‐dominated) and the W structure (bending‐dominated) as object, the deformation and failure mechanisms of two structures were studied. Then, the PWP (i.e., the fracture zone of the P structure filling with the W structure) and WPW (i.e., the fracture zone of the P structure filling with the W structure) structures with uniform and gradient change were designed. The structures were fabricated using Stereo Lithography Appearance (SLA) process and compressed under quasi static conditions (5.04 mm/min). And the energy absorption capacity comparison of the uniform P, uniform W structures and their gradient hybridization are studied. The experimental results show that the maximum energy absorption efficiency of the PWP structure is 38.85% higher than that of the P structure and the densification energy absorption of the WPW structure is 66.67% higher than that of the W structure. Additionally, gradient design can effectively improve the densification energy absorption of lattice structure. It is demonstrated that such hybrid structures can improve the energy absorption efficiency of the stretching‐dominated structure and the energy absorption of the bending‐dominated structure while retaining the performance advantages of the original structures. The novel structural design greatly contributes to customized energy absorption design of lattice structures.This article is protected by copyright. All rights reserved.