Rahimi Shayan, Asghari Mohsen
Department of Mechanical Engineering, Sharif University of Technology, Tehran, Iran.
Heliyon. 2024 Dec 4;11(1):e40911. doi: 10.1016/j.heliyon.2024.e40911. eCollection 2025 Jan 15.
Lattice structures are an innovative solution to increase the strength-to-weight ratio of a structure. In this study, two polymeric hybrid lattice structures-"FRB" (a heterogenous structure which is indeed a BCC structure reinforced by FCC unit cells dispersed in a way to form a chessboard pattern in each layer) and the "Multifunctional" (a homogenous structure whose unit cells are a combination of FCC and BCC unit cells where their central nodes are connected)-are proposed, fabricated via liquid crystal display 3D printing technique, and their mechanical characteristics are evaluated under quasi-static loading, experimentally and numerically. The results indicate a 15.71 % increase in compressive strength and a 103.75 % improvement in volumetric energy absorption for the FRB structure compared to BCC. The Multifunctional structure revealed a 74.30 % increase in compressive strength along with a 111.30 % improvement in volumetric energy absorption compared to BCC, though it exhibited a 13.33 % decrease in specific energy absorption compared to the FCC structure. Both the proposed designs have merits; the FRB structure suitable for lightweight energy absorption and the Multifunctional structure appropriate for high load-bearing applications where the overall weight is not the primary concern.
晶格结构是提高结构强度重量比的一种创新解决方案。在本研究中，提出了两种聚合物混合晶格结构——“FRB”（一种异质结构，实际上是一种体心立方（BCC）结构，由面心立方（FCC）晶胞增强，每层以棋盘图案的方式分散排列）和“多功能”结构（一种同质结构，其晶胞是FCC和BCC晶胞的组合，它们的中心节点相连），通过液晶显示3D打印技术制造，并在准静态载荷下对其力学特性进行了实验和数值评估。结果表明，与BCC相比，FRB结构的抗压强度提高了15.71%，体积能量吸收提高了103.75%。多功能结构与BCC相比，抗压强度提高了74.30%，体积能量吸收提高了111.30%，不过与FCC结构相比，其比能量吸收降低了13.33%。两种设计都有优点；FRB结构适用于轻质能量吸收，多功能结构适用于高承载应用，在这些应用中，整体重量不是主要关注点。
