Static and dynamic compressive behaviour of 3D printed auxetic lattice reinforced ultra-high performance concrete
Static and dynamic compressive behaviour of 3D printed auxetic lattice reinforced ultra-high performance concrete
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DOI：
10.1016/j.cemconcomp.2023.105046
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发表时间：
2023-05
影响因子：
10.5
通讯作者：
Meng Chen;Zegang Chen;Yiwei Xuan;Tong Zhang;Mingzhong Zhang
中科院分区：
文献类型：
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作者：
Meng Chen;Zegang Chen;Yiwei Xuan;Tong Zhang;Mingzhong Zhang
本文对三维八角形、重入式蜂窝和三角形晶格增强超高性能混凝土，即O-UHPC、H-UHPC和T-UHPC以及钢纤维增强UHPC （S-UHPC）的静态和动态压缩性能进行了系统的实验研究。通过力学试验研究了不同应变率（0、34.8、59.7、86.7、108.5和134.7 s−1）下UHPC复合材料的静态和动态压缩行为，包括破坏模式、应力-应变曲线、动态增加因子（DIF）、动态压缩应变和能量耗散。以普通UHPC和S-UHPC作为对照。结果表明：H-UHPC的静态抗压强度比O-UHPC和T-UHPC高14.6 ~ 19.4%；S-UHPC在较低应变率下表现出较高的动抗压强度，而H-UHPC和T-UHPC在较高应变率下的动抗压强度最高，分别为262.7 MPa和222.2 MPa。在高应变速率下，H-UHPC的总能量和裂纹后能量最高。总体而言，H-UHPC在高应变率下具有相当的静态压缩性能，但在强度、延性、能量耗散和DIF方面具有更好的动态压缩性能，与其他UHPC样品相比，这表明再入蜂窝是制造具有最佳auxetic 3D晶格的UHPC的更好选择。
This paper presents a systematic experimental study on static and dynamic compressive behaviour of 3D octet, re-entrant honeycomb and triangular lattice reinforced ultra-high performance concrete, i.e., O-UHPC, H-UHPC and T-UHPC as well as steel fibre reinforced UHPC (S-UHPC). Mechanical tests were conducted to investigate the static and dynamic compressive behaviour of UHPC composites including failure pattern, stress-strain curve, dynamic increase factor (DIF), dynamic compressive strain and energy dissipation under various strain rates (i.e., 0, 34.8, 59.7, 86.7, 108.5 and 134.7 s−1). The plain UHPC and S-UHPC were used as references for comparison. Results indicate that H-UHPC has a 14.6–19.4% higher static compressive strength than O-UHPC and T-UHPC. S-UHPC exhibits higher dynamic compressive strength at lower strain rates, while the dynamic strengths of H-UHPC and T-UHPC at higher strain rates reach the highest, i.e., 262.7 MPa and 222.2 MPa, respectively. The highest total energy and post-crack energy at high strain rates take place on H-UHPC. Overall, H-UHPC has comparable static compressive behaviour but better dynamic compressive behaviour at high strain rates in terms of strength, ductility, energy dissipation and DIF, compared with other UHPC specimens, suggesting that re-entrant honeycomb is a better choice for manufacturing UHPC with optimal auxetic 3D lattices.