Unraveling the reinforcing mechanisms for cementitious composites with 3D printed multidirectional auxetic lattices using X-ray computed tomography

被引:4
作者
Meng, Zhaozheng [1 ]
Xu, Yading [1 ]
Xie, Jinbao [1 ]
Zhou, Wen [1 ]
Bol, Rowin J. M. [1 ]
Liu, Qing-feng [2 ]
Savija, Branko [1 ]
机构
[1] Delft Univ Technol, Fac Civil Engn & Geosci, Microlab, Stevinweg 1, NL-2628 CN Delft, Netherlands
[2] Shanghai Jiao Tong Univ, Sch Ocean & Civil Engn, State Key Lab Ocean Engn, Shanghai, Peoples R China
基金
欧洲研究理事会;
关键词
3D printing; Auxetic lattices; Cementitious composites; X-ray CT; Energy absorption; BEHAVIOR;
D O I
10.1016/j.matdes.2024.113331
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This study investigates the mechanical properties of cementitious composites with 3D-printed auxetic lattices, featuring negative Poisson's ratios (auxetic behavior) in multiple directions. These lattices were fabricated using vat photopolymerization 3D printing, and three base materials with varying stiffness and deformation capacities were analyzed to determine their impact on the composites' mechanical behavior. To unravel the reinforcing mechanisms of multidirectional auxetic lattices, which exhibit auxetic behavior in both planar and out-of-plane directions, X-ray computed tomography (X-ray CT) was utilized to analyze composite damage evolutions under different strain levels. The micro-CT characterization reveals that auxetic lattices more effectively constrain crack growth and dissipate energy by distributing stress evenly within the cement matrix. In contrast, due to lack of lateral confinement, the non-auxetic lattice reinforced composites primarily dissipate energy through extensive crack propagation and interfacial damage, leading to lower peak strength. When strain exceeding 5%, although the confinement from the auxetic behavior diminished with crack propagation, the lattice can still maintain the composite's structural integrity, resulting in 1.7 times higher densification energy than conventional cement- based materials. These findings provide valuable insights for designing auxetic lattice-reinforced cementitious composites with enhanced load-bearing capacity and improved dissipation capabilities.
引用
收藏
页数:17
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