Front face strain compliance for quantification of short crack growth in fatigue testing

IF 1.4 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Strain Analysis for Engineering Design Pub Date : 2023-05-13 DOI:10.1177/03093247231173741

H. Saeed, Somsubhro Chaudhuri, W. De Waele

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Abstract

Short fatigue crack growth investigation is of considerable scientific interest as it comprises a significant portion of the total fatigue life of a structure. It is very challenging to accurately quantify this stage of fatigue crack growth experimentally. In this article, a novel front face strain compliance technique for single-edge notched specimens subjected to four-point bending is proposed. Finite element analysis is performed to determine the correlation between crack length and strain change near the crack. This relationship is then validated by experiments in which strains are measured by strain gauges attached near the short crack, and crack length is quantified by examining beachmark lines at the fracture surfaces. Based on the numerical and experimental results, it is concluded that the strain measured near the notch allows quantifying short crack growth for normalised crack lengths in the range 0.01 ≤ a/W ≤ 0.06 (a/W being the ratio of crack length over specimen width). A compliance equation based on the front face strain is finally presented.

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疲劳试验中短裂纹扩展量化的正面应变顺应性

短疲劳裂纹扩展研究具有重要的科学意义，因为它占结构总疲劳寿命的很大一部分。在实验上准确地量化这一阶段的疲劳裂纹扩展是非常具有挑战性的。本文提出了一种新的四点弯曲单刃缺口试件前面应变顺应技术。通过有限元分析确定裂纹长度与裂纹附近应变变化的关系。然后通过实验验证了这种关系，在实验中，通过连接在短裂纹附近的应变片测量应变，并通过检查断口表面的海滩标记线来量化裂纹长度。数值和实验结果表明，缺口附近测量的应变可以量化归一化裂纹长度在0.01≤a/W≤0.06 (a/W为裂纹长度与试件宽度之比)范围内的短裂纹扩展。最后给出了基于前面应变的柔度方程。

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

Journal of Strain Analysis for Engineering Design 工程技术-材料科学：表征与测试

CiteScore

3.50

自引率

6.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Strain Analysis for Engineering Design provides a forum for work relating to the measurement and analysis of strain that is appropriate to engineering design and practice. "Since launching in 1965, The Journal of Strain Analysis has been a collegiate effort, dedicated to providing exemplary service to our authors. We welcome contributions related to analytical, experimental, and numerical techniques for the analysis and/or measurement of stress and/or strain, or studies of relevant material properties and failure modes. Our international Editorial Board contains experts in all of these fields and is keen to encourage papers on novel techniques and innovative applications." Professor Eann Patterson - University of Liverpool, UK This journal is a member of the Committee on Publication Ethics (COPE).