基于微观结构势垒的循环r曲线的概率描述

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue Pub Date : 2025-04-02 DOI:10.1016/j.ijfatigue.2025.108953

Joona Vaara , Kimmo Kärkkäinen , Miikka Väntänen , Jukka Kemppainen , Bernd Schönbauer , Suraj More , Mari Å man , Tero Frondelius

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引用次数: 0

摘要

推导了概率循环r曲线的一个模型。该模型基于常用的连续微观结构障面假设，定义了微观结构短裂纹的不稳定行为以及随着微观结构特征的重要性下降而向物理短裂纹的过渡。该模型可以描述传统循环r曲线分析与El-Haddad型Kitagawa-Takahashi图之间的联系，并具有小缺陷尺寸下的渐近疲劳极限。该模型与实验非扩展裂纹长度的拟合完全符合几种缺陷类型和尺寸的观察和预测疲劳极限。所提出的框架可以用于分析任何几何形状、装载历史或缺陷配置，包括缺陷交互问题。

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Probabilistic description of the cyclic R-curve based on microstructural barriers

A model for the probabilistic cyclic R-curve has been derived. The model is based on the commonly used hypothesis of consecutive microstructural barrier fronts defining the erratic behavior of microstructurally short cracks and the transition to physically short cracks with declining importance of the microstructural features. The model can describe the linkage between the traditional cyclic R-curve analyses and the El-Haddad type Kitagawa-Takahashi diagrams with the asymptotic fatigue limit at small defect sizes. The model fit against the experimental non-propagating crack lengths perfectly matches the observed and predicted fatigue limit for several defect types and sizes. The presented framework can be used to analyze any geometry, loading history, or defect configuration, including defect interaction problems.

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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.