Fatigue properties of RPC under cyclic loads of single-stage and multi-level amplitude |
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Authors: | Mingzhe An Ziruo Yu Meili Sun Shuaiquan Zheng and Lei Liang |
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Affiliation: | (1) School of Materials Science and Engineering, Tianjin University, Tianjin, 300072, People's Republic of China;(2) China FSW Center Beijing FSW Technology Limited Company, Beijing, 100024, People's Republic of China; |
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Abstract: | Fatigue properties of Reactive Powder Concrete (RPC) under axial compression of single-stage and multi-level amplitude in
cycles were studied. The tests reveal the fatigue life, the strain and residual life of the RPC samples. Through the analysis
of the test results under cyclic loads of single amplitude, the S-N curve of RPC and the evolution rule of macro-damage of
RPC were presented, which can be divided into latency stage, stable development stage and instability development stage according
to the evolution pattern of the fatigue crack. Accordingly, the development of longitudinal deformation presents the similar
three-stage-model, and the proportion of each stage is 15%, 75%, and 10%. According to test results, the fatigue strength
reduction factor is 0.564. We brought forward an empirical formula to predict the life of RPC via total longitudinal strain
and got the evolving rule for the residual strength of the RPC. The analysis of the test results under cyclic loads of multi-level
amplitude shows that the strain under this loading pattern experiences three stages. The characteristic value for the residual
strain was obtained. The irreversible damage and non-linear evolution of RPC was described by the development of the residual
plastic strain. |
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