Simulation of mixed mode I-II fatigue crack propagation in concrete with different strengths

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL Theoretical and Applied Fracture Mechanics Pub Date : 2025-02-01 Epub Date: 2024-11-26 DOI:10.1016/j.tafmec.2024.104779

Hong Chen , Zhimin Wu , Rena C. Yu

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Abstract

The mode-I fatigue crack propagation in concrete has been extensively studied. However, many concrete structure failures occur subjected to mixed-mode fatigue loads in practice. The accurate predictions for the mixed mode I-II fatigue crack propagation and fatigue life are crucial for evaluating the structural safety of concrete constructions. In this paper, the mixed mode I-II fatigue crack propagation process on concrete with different strengths is simulated using the fatigue tension-softening constitutive model and the crack propagation criterion of the initial fracture toughness as a parameter (SIF-based criterion). The numerical results indicated that the fatigue crack length decreases with increasing the concrete strength for a given fatigue load level, but the fatigue life significantly increases with concrete strength. Further, a modified Paris law is presented on the basis of the numerical results for concrete with different strengths. With the known tensile strength of concrete, the mixed mode I-II fatigue crack propagation rate of concrete with different strengths can be presented. The proposed model in this study is useful in further predicting the fatigue life of concrete structures under mixed-mode fatigue loads.

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不同强度混凝土I-II混合模式疲劳裂纹扩展模拟

混凝土i型疲劳裂纹的扩展已经得到了广泛的研究。然而，在实际应用中，混凝土结构在混合模态疲劳荷载作用下发生了许多破坏。准确预测I-II型混合模态疲劳裂纹扩展和疲劳寿命是评价混凝土结构安全性的关键。本文采用疲劳拉伸-软化本构模型，以初始断裂韧性的裂纹扩展准则（基于sif准则）为参数，模拟了不同强度混凝土的I-II混合模式疲劳裂纹扩展过程。结果表明，在一定的疲劳荷载水平下，混凝土的疲劳裂纹长度随混凝土强度的增加而减小，而疲劳寿命随混凝土强度的增加而显著增加。在此基础上，对不同强度混凝土的数值计算结果提出了修正的巴黎定律。在已知混凝土抗拉强度的情况下，可以得到不同强度混凝土的I-II型混合模式疲劳裂纹扩展速率。本文所建立的模型有助于进一步预测混凝土结构在混合模态疲劳荷载作用下的疲劳寿命。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.