On an accurate and automated location of fatigue crack tip by analysing the displacement fields measured with digital image correlation

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-17 DOI:10.1016/j.tafmec.2025.105245

A. Camacho-Reyes , G.L. Gómez Gonzales , J.M. Vasco-Olmo , F.A. Diaz

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引用次数: 0

Abstract

This paper presents two algorithms for locating the tip of growing fatigue cracks by analysing Digital Image Correlation (DIC) data. This work aims to develop algorithms that are accurate, mathematically simple, easy to implement, and computationally efficient for this purpose. In addition, the goal is to simplify experimental setups and avoid invasive techniques, thereby integrating all measurements into the DIC analysis. The algorithms are implemented by analysing the crack tip displacement fields measured by DIC, establishing the discontinuity along the crack path during fatigue propagation as the basis for estimating the accurate crack tip location. The algorithms were validated through two representative cases: a straight-growing fatigue crack in a Compact Tension specimen made of commercially pure Titanium, and an inclined-growing fatigue crack in a Double Cantilever Beam specimen made of 2024-T3 aluminium alloy. A good level of agreement has been achieved between the results obtained with the implemented algorithms and those from an alternative method, with relative deviations of approximately 2 %.

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通过对数字图像相关测量的位移场分析，实现了疲劳裂纹尖端的精确自动定位

本文提出了两种基于数字图像相关（DIC）数据的扩展疲劳裂纹尖端定位算法。这项工作旨在为这一目的开发准确、数学简单、易于实现和计算效率高的算法。此外，目的是简化实验设置，避免侵入性技术，从而将所有测量结果整合到DIC分析中。该算法通过分析DIC测量的裂纹尖端位移场来实现，建立疲劳扩展过程中沿裂纹路径的不连续作为估计精确裂纹尖端位置的基础。通过工业纯钛致密拉伸试样的直向扩展疲劳裂纹和2024-T3铝合金双悬臂梁试样的斜向扩展疲劳裂纹两种典型案例对算法进行了验证。用所实现的算法得到的结果与另一种方法得到的结果之间达到了很好的一致性，相对偏差约为2%。

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.