应力比对钢疲劳裂纹扩展行为的影响与屈服-抗拉强度比和断裂韧性有关

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-05-23 DOI:10.1016/j.tafmec.2025.105015

Anye Xu , Yipin Wan , Bolun Li , Xing Yang , Min Ye , Xuding Song

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引用次数: 0

摘要

疲劳裂纹扩展（FCG）行为与应力比(R)有关，是评估材料耐久性的关键。基于断裂力学理论和渐近分析，将FCG速率曲线的渐近极限与断裂韧性和疲劳裂纹扩展阈值的R依赖关系联系起来，建立了包含R、屈服抗拉强度比和断裂韧性的渐进式FCG速率模型。此外，引入对数正态分布理论进行概率分析，以考虑由于材料异质性和测试误差导致的FCG测量中不可避免的散射。验证结果表明，所提出的模型可以准确地描述近阈值阶段、Paris阶段和不稳定阶段的FCG行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

$Stress ratio effect on fatigue crack growth behavior for steels related to yield-to-tensile strength ratio and fracture toughness$

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Stress ratio effect on fatigue crack growth behavior for steels related to yield-to-tensile strength ratio and fracture toughness

Fatigue crack growth (FCG) behavior related to stress ratio (R) is critical for assessing material durability. Based on fracture mechanics theory and asymptotic analysis, a progressive FCG rate model is derived by incorporating R, yield-to-tensile strength ratio, and fracture toughness by linking asymptotic limits of FCG rate curve with the R-dependent relationship between fracture toughness and fatigue crack growth threshold. Additionally, lognormal distribution theory is introduced for probabilistic analysis to consider the inevitable scatter in FCG measurements caused by material heterogeneity and testing errors. Validation results show that the proposed model can accurately describe FCG behavior for long cracks in near-threshold, Paris, and unstable stages at varying R from 0 to 0.6 for steels.

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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.