| Citation: |
Dong Zehua, Wang Kaichuan, Jingchuan, et al. Fatigue life of high strength strain hardening cementitious composite under uniaxial compression[J]. Acta Materiae Compositae Sinica.
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High strength strain hardening cementitious composite (HS-SHCC) is a new type of high-performance cement-based material with excellent tensile ductility and crack control ability. Investigating the fatigue performance of HS-SHCC is of great significance for the design of engineering structures. This paper studied the influence of stress levels (0.9, 0.85, 0.8, 0.75, 0.7) on the fatigue life of HS-SHCC under uniaxial compressive fatigue loading. The failure modes were observed, and the effect of stress level on the fatigue creep curve was analyzed. The results indicate that the failure mode of the specimen under compressive fatigue was shear failure which shows little relationship with the stress level. The maximum strain of HS-SHCC display obvious three stages of rapid development, stable development and instability. The fatigue life decreases with the stress level increasing. Similar to ordinary strength SHCC, the S-N curve of HS-SHCC specimens shows a bilinear trend. Based on the obtained S-N curve and three-parameter Weibull distribution theory, a compressive fatigue life prediction model of HS-SHCC under different failure probabilities is proposed. On this basis, the maximum stress level corresponding to the fatigue strength limit (corresponding to 2 million fatigue cycles) of HS-SHCC is predicted to be 0.638.
Strain hardening cementitious composites (SHCC) is one kind of high performance fiber reinforced cementitious composites that exhibited strain hardening behavior and micro-crack control ability. These advantages could address the limitations of low tensile strength and poor toughness observed in concrete. When SHCC is applied to practical engineering, it is inevitably subjected to fatigue load. Therefore, it is necessary to pay attention to its fatigue performance. However, the existing research on the mechanical behavior and life law of SHCC, especially the high strength strain hardening cementitious composites (HS-SHCC), under uniaxial compressive fatigue load is very limited. This will limit its promotion and application in engineering. Therefore, this paper aims to address these limitations by studying the compressive fatigue behavior of HS-SHCC under various stress levels, analyzing the fatigue strain accumulation law under and predicting its fatigue life under different stress levels.
In this paper, the fatigue behavior of HS-SHCC under different stress levels ( 0.7, 0.75, 0.8, 0.85 and 0.9 ) was studied by uniaxial compression fatigue testing. The crack development and failure mode of the specimen after fatigue failure were observed. The axial strain of the specimen were monitored throughout the loading process using a data acquisition instrument, and the influence of stress level on the fatigue creep curve was analyzed. Based on these data, three-parameter Weibull distribution model was employed to formulate a fatigue life prediction functions of HS-SHCC under different stress levels. Furthermore, the fatigue limit of HS-SHCC was further evaluated by failure probability analysis.
The results indicate that the fatigue failure mode of HS-SHCC specimens exhibits a trend independent of stress level. Due to the bridging effect of fibers, the specimens show obvious shear failure characteristics. When the specimen is destroyed, a penetrating main crack is formed on the surface of the specimen, accompanied by the generation and distribution of a large number of micro cracks, showing the toughness characteristics of the material. The fatigue creep curve of the specimen is characterized by three development stages: rapid development stage, stable development stage and instability stage. The stress level shows a significant effect on the three-stage life distribution. When the stress level is in the range of 0.7-0.75, the rapid development stage accounts for approximately 3 % of the fatigue life, the stable development stage accounts for about 95 %, while the instability stage only accounts for about 2 %, and the stable deformation stage lasts for a long time. However, when the stress level increases to 0.9, the rapid development stage becomes less obvious, and the proportion of the instability development stage to the fatigue life gradually increases to about 15 %. This phenomenon is significantly different from that of ordinary SHCC. The three-parameter Weibull distribution model is employed to construct the fatigue life prediction equation under different stress levels. The maximum stress level corresponding to the fatigue strength limit when the failure probability is 0.05 is predicted to be 0.638.Conclusions: Under uniaxial compression fatigue loading, the SHCC specimen's failure mode is characterised by shear failure, exhibiting a consistent trend irrespective of the stress level. The fibre bridging effect leads to a large number of small cracks appearing around the main crack as the specimen is destroyed. The maximum strain of HS-SHCC specimens displays a three-stage development trend: a rapid development stage, a stable development stage, and an instability stage. The fatigue stress level exerts a substantial influence on the maximum strain of the HS-SHCC specimen, and determines the three-stage’s life distribution. The S-N curve of the HS-SHCC specimen manifests notable bilinear characteristics. The compression fatigue life prediction function of HS-SHCC under different stress levels was constructed by using the three-parameter Weibull distribution model. This model was used to predict the maximum stress level corresponding to the fatigue strength limit of HS-SHCC to be 0.638 at the failure probability 0.05.
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