Micro-mechanical model for ultra-high strength and ultra-high ductility cementitious composites (UHS-UHDCC)

Micro-mechanical model for ultra-high strength and ultra-high ductility cementitious composites (UHS-UHDCC)
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超高强度和超高延性水泥基复合材料的微观力学模型(UHS-UHDCC)

DOI:
10.1016/j.conbuildmat.2020.120668
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发表时间:
2020-11
影响因子:
7.4
通讯作者:
Mechtcherine Viktor
Mechtcherine Viktor
中科院分区:
工程技术1区
文献类型:
--
作者:
Lei Dong-Yi;Guo Li-Ping;Li Ying;Liu Jia-Ping;Chen Bo;Li Dong-Xu;Li Shao-Chun;Mechtcherine Viktor

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研究发现UHS-UHDCC(ultra-high strength and ultra-high distributability cementitious composites)材料的滑移硬化参数β随PE纤维倾角的增大而增大,引入滑移硬化增加系数ω对ECC模型中的β进行修正。因此,本文提出了单根PE纤维拔出的细观力学模型,并将PE纤维的脱粘行为定义为“物理脱粘”。单根PE纤维的拔出载荷-位移曲线和单裂纹应力-张开曲线验证了所提出的UHS-UHDCC细观力学模型的正确性。初裂应力(σ fc,5.78MPa)和纤维桥接余能(Jb ',352.1J/m2)满足强度和能量准则,保证了拉伸应变硬化行为的实现。该研究为实现UHS-UHDCC的多裂纹应变硬化行为提供了理论依据。
This study finds that the slip-hardening parameter (β) increases with the increasing of PE (Polyethylene) fiber inclination for UHS-UHDCC (ultra-high strength and ultra-high ductility cementitious composites), the slip-hardening increasing coefficient (ω) is introduced to correct the β of ECC model. Therefore, the single PE fiber pullout micro-mechanical model is proposed, and this study defines the debonding behavior of PE fiber as the ‘physical debonding’. The pullout load–displacement curve of the single PE fiber and the single crack stress-opening curve verify the correctness of proposed micro-mechanical model for UHS-UHDCC. The first-crack stress (σ fc, 5.78 MPa) and the fiber bridging complementary energy (J b', 352.1 J/m 2) satisfy the strength and the energy criteria, this ensures the realization of the tensile strain-hardening behavior. This study provides a theory basis for realizing the multi-cracking strain hardening behavior of UHS-UHDCC.
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