Effect of loading frequency on tensile fatigue behavior of ultra-high-strength engineered cementitious composites

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2024-11-08 DOI:10.1016/j.ijfatigue.2024.108701

Fuhao Deng , Zhao Wang , Yuanhao Wei

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Abstract

The ultra-high-strength engineering cementitious composites demonstrates pseudo strain hardening behavior when subjected to uniaxial tension, making it a promising material for enduring repeated or fatigue loads. Extensive research has been conducted on the quasi-static, dynamic, and fatigue behavior of this composites. However, due to the challenges of conducting direct tensile testing on concrete, investigations into the tensile fatigue behavior of ECC, particularly for ultra-high-strength ECC, remain limited. The fatigue behavior of concrete can be influenced by various factors. This study focuses on the impact of loading frequency. Several series of tensile fatigue tests were conducted under different loading frequencies and stress levels. The test results revealed that fatigue life increases with higher applied loading frequencies and decreases with increasing stress levels. The analysis of the test results includes the examination of failure modes, fatigue life, deformation, and secondary strain rates. A probabilistic model of fatigue failure, considering the discreteness of the initial static strength, was proposed based on the fatigue life. This model aligned well with the experimental results, providing valuable insights into the behavior of ultra-high-strength ECC under tensile fatigue conditions.

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加载频率对超高强度特种水泥基复合材料拉伸疲劳行为的影响

超高强度工程水泥基复合材料在承受单轴拉伸时会出现假应变硬化行为，因此是一种很有希望承受重复或疲劳载荷的材料。人们对这种复合材料的准静态、动态和疲劳行为进行了广泛的研究。然而，由于对混凝土进行直接拉伸测试存在挑战，对 ECC 拉伸疲劳行为的研究仍然有限，尤其是对超高强度 ECC 的研究。混凝土的疲劳行为会受到各种因素的影响。本研究侧重于加载频率的影响。在不同的加载频率和应力水平下进行了多个系列的拉伸疲劳试验。试验结果表明，疲劳寿命随着加载频率的增加而增加，随着应力水平的增加而减少。对试验结果的分析包括对失效模式、疲劳寿命、变形和二次应变率的检查。考虑到初始静态强度的离散性，根据疲劳寿命提出了疲劳失效的概率模型。该模型与实验结果非常吻合，为了解超高强度 ECC 在拉伸疲劳条件下的行为提供了宝贵的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.