期刊
JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
卷 -, 期 -, 页码 -出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/03093247231173741
关键词
Fatigue; short crack; strain compliance; front face strain; SEN(B) specimen
This article proposes a novel front face strain compliance technique for accurately quantifying the short fatigue crack growth stage. This method is validated by numerical analysis and experiments, and a compliance equation based on the front face strain is presented.
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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