疲劳状态下结构的存活概率:基于数据的方法

IF 3 3区 工程技术 Q2 ENGINEERING, MECHANICAL
François-Baptiste Cartiaux , Frédéric Legoll , Alex Libal , Julien Reygner
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引用次数: 0

摘要

本文探讨了承受变幅循环载荷的结构疲劳寿命的概率性质。借鉴我们在最近的文章(Cartiaux 等人,2023 年)中介绍的米纳累积损伤规则的形式化,我们采用我们的方法,利用实验数据估算工业结构的存活概率。研究同时考虑了结构初始状态和加载周期振幅的随机性。结果表明,加载周期的可变性可以通过确定性等效损伤的概念来捕捉,为评估结构的疲劳寿命提供了一种计算效率高的方法。此外,文章还强调,米纳法则和最薄弱环节原则的通常组合会系统性地高估结构的疲劳寿命。在我们考虑的案例研究中,这种高估达到了两个以上的乘法系数。随后,我们将介绍我们引入的概率框架如何对这种高估现象进行补救。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Survival probability of structures under fatigue: A data-based approach

This article addresses the probabilistic nature of fatigue life in structures subjected to cyclic loading with variable amplitude. Drawing on the formalization of Miner’s cumulative damage rule that we introduced in the recent article (Cartiaux et al., 2023), we apply our methodology to estimate the survival probability of an industrial structure using experimental data. The study considers both the randomness in the initial state of the structure and in the amplitude of loading cycles. The results indicate that the variability of loading cycles can be captured through the concept of deterministic equivalent damage, providing a computationally efficient method for assessing the fatigue life of the structure. Furthermore, the article highlights that the usual combination of Miner’s rule and of the weakest link principle systematically overestimates the structure’s fatigue life. On the case study that we consider, this overestimation reaches a multiplicative factor of more than two. We then describe how the probabilistic framework that we have introduced offers a remedy to this overestimation.

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来源期刊
Probabilistic Engineering Mechanics
Probabilistic Engineering Mechanics 工程技术-工程:机械
CiteScore
3.80
自引率
15.40%
发文量
98
审稿时长
13.5 months
期刊介绍: This journal provides a forum for scholarly work dealing primarily with probabilistic and statistical approaches to contemporary solid/structural and fluid mechanics problems encountered in diverse technical disciplines such as aerospace, civil, marine, mechanical, and nuclear engineering. The journal aims to maintain a healthy balance between general solution techniques and problem-specific results, encouraging a fruitful exchange of ideas among disparate engineering specialities.
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