Uniaxial cyclic loading deformation and fatigue life of ECC

HUO Haifeng; YANG Yajing; LI Changhui; LIU Hanlei; CHEN Yu; WU Kun

doi:10.13801/j.cnki.fhclxb.20220225.003

Volume 39 Issue 11

Nov. 2022

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HUO Haifeng, YANG Yajing, LI Changhui, et al. Uniaxial cyclic loading deformation and fatigue life of ECC[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5453-5464. doi: 10.13801/j.cnki.fhclxb.20220225.003

Citation:

HUO Haifeng, YANG Yajing, LI Changhui, et al. Uniaxial cyclic loading deformation and fatigue life of ECC[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5453-5464. doi: 10.13801/j.cnki.fhclxb.20220225.003

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Uniaxial cyclic loading deformation and fatigue life of ECC

doi: 10.13801/j.cnki.fhclxb.20220225.003

HUO Haifeng^{1, 2},
YANG Yajing¹,
LI Changhui^{1
,
,},
LIU Hanlei¹,
CHEN Yu¹,
WU Kun¹

1.
School of Transportation Science and Engineering, Civil Aviation University of China, Tianjin 300300, China
2.
Ministry of Transportation Airport Engineering Safety and Long-term Performance Research Base, Tianjin 300300, China

Received Date: 2021-11-01
Accepted Date: 2022-02-10
Rev Recd Date: 2022-02-07

Available Online: 2022-02-26

Publish Date: 2022-11-01

Abstract

Abstract

Engineered cementitious composites (ECC) are mostly used for seismic reinforcement of structures, and their fatigue performance is a major concern in engineering. In order to study the fatigue performance of ECC, the uniaxial tensile cyclic loading test was performed by fatigue testing machine, and the displacement development and cracking behavior in real time were monitored by using digital image correlation (DIC) technology to analyze the dynamic deformation and fatigue law of ECC specimens and establish the fatigue equation. The results show that the strain and axial displacement of ECC specimens develop similarly, which are divided into the initial stage, stable development stage, accelerated deformation stage and damage stage. The smaller the dynamic stress ratio, the faster the strain development and the larger the accumulated axial strain when damage occurs. The stiffness ratio development curve is divided into three parts: Rapid decline stage, stable decline stage and damage stage. The fatigue life of the ECC specimen obeys the two-parameter Weibull distribution well. By establishing two forms of fatigue equations: S-lgN and S-lgN-F fatigue equations, the ultimate fatigue life is brought into the average life fatigue equation, and the fatigue ultimate stress level is 70.80%. The corresponding fatigue ultimate strength is 2.69 MPa.
- engineering cementitious composites,
- axial tensile fatigue,
- fatigue deformation,
- S-N curve,
- digital image correlation
Long Abstrsct
Innovation Points

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References(29)

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