A unified threshold model for physically small and long crack based on CTOD

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-05-14 DOI:10.1016/j.tafmec.2025.105002

Lindong Chai , Lu Han , Luping Ren , Yihai He , Wei Zhang

引用次数: 0

Abstract

In this paper, a physically small crack threshold model based on crack tip opening displacement (CTOD) is proposed. Firstly, an in-situ SEM crack growth testing and a unified physically small crack (PSC) and long crack (LC) growth model are briefly reviewed to demonstrate that CTOD serves as a unified driving parameter for PSC and LC. Subsequently, considering the crack closure and microstructural dissimilitude, the threshold CTOD model is established. Thus, the threshold stress and corresponding non-propagating crack length can be calculated. Finally, several datasets for various materials and loading conditions are used to verify the proposed model. The model prediction has a good agreement with the experimental data. Additionally, a comparison between the proposed model and main small crack threshold models is conducted. The relationship between the transition crack length from PSC to LC and the El Haddad parameter is also discussed.

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基于CTOD的物理小长裂纹统一阈值模型

提出了一种基于裂纹尖端张开位移（CTOD）的物理小裂纹阈值模型。首先，简要回顾了原位SEM裂纹扩展试验和统一的物理小裂纹（PSC）和长裂纹（LC）扩展模型，证明了CTOD是PSC和LC的统一驱动参数。随后，考虑裂纹闭合和微观结构差异，建立了阈值CTOD模型。从而可以计算出临界应力和相应的非扩展裂纹长度。最后，使用不同材料和加载条件的数据集验证了所提出的模型。模型预测结果与实验数据吻合较好。并与主要的小裂纹阈值模型进行了比较。讨论了从PSC到LC的过渡裂纹长度与El Haddad参数的关系。

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

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.