Effect of water saturation on uniaxial constant amplitude tensile fatigue performance of ECC and its statistical analysis of fatigue life

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-10-24 DOI:10.1016/j.ijfatigue.2024.108666

Shuling Gao , Qingyuan Xu , Zhengwen Wang , Yanping Zhu

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Abstract

The degree of water saturation has a significant influence on the tensile fatigue properties of Engineered Cementitious Composites (ECC). The half-saturated and saturated state ECC can be rapidly prepared by a vacuum saturation equipment. The fatigue tensile mechanical tests under five tensile stress levels and corresponding studies on the damage morphology, fatigue life, S-N relationship, fatigue strain and fatigue damage on dry, half-saturated, and saturarted state were conducted. The mathematical and statistical analysis method was also utilized to predict ECC’s fatigue life and strength with high confidence and high reliability, providing a reference for assessing structural safety. The study found that free water significantly reduces ECC fatigue strength, with fatigue life decreasing as water content increases. At 2 million cycles, fatigue strength reduction coefficients for 0%, 50%, and 100% water saturation are 0.623, 0.550, and 0.423, respectively. The three-parameter Weibull distribution best describes ECC fatigue life. Using this model, S-N and P-S-N curves were developed, incorporating confidence limits to derive γ-P-S-N relationships, ensuring high confidence and reliability.

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水饱和度对 ECC 单轴恒幅拉伸疲劳性能的影响及其疲劳寿命统计分析

水饱和度对工程水泥基复合材料（ECC）的拉伸疲劳性能有重要影响。半饱和及饱和状态的 ECC 可通过真空饱和设备快速制备。在五个拉伸应力水平下进行了疲劳拉伸力学试验，并对干燥、半饱和和饱和状态下的损伤形态、疲劳寿命、S-N 关系、疲劳应变和疲劳损伤进行了相应的研究。并利用数理统计分析方法对 ECC 的疲劳寿命和强度进行了高置信度和高可靠性预测，为评估结构安全性提供了参考。研究发现，游离水会显著降低 ECC 的疲劳强度，疲劳寿命随着含水量的增加而降低。在 200 万次循环中，0%、50% 和 100% 水饱和度的疲劳强度降低系数分别为 0.623、0.550 和 0.423。三参数 Weibull 分布最能说明 ECC 的疲劳寿命。利用该模型，绘制了 S-N 和 P-S-N 曲线，并结合置信区间推导出 γ-P-S-N 关系，确保了高置信度和可靠性。

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来源期刊

International Journal of Fatigue 工程技术-材料科学：综合

CiteScore

10.70

自引率

21.70%

发文量

619

审稿时长

58 days

期刊介绍： Typical subjects discussed in International Journal of Fatigue address: Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements) Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions) Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation) Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering Smart materials and structures that can sense and mitigate fatigue degradation Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.