4.7 Article

Directions of high cycle fatigue cracks emanating from circular notches studied by optical profilometry

期刊

INTERNATIONAL JOURNAL OF FATIGUE
卷 165, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2022.107117

关键词

High cycle fatigue; Notch; Crack path; Crack initiation point; Crack direction

资金

  1. European Union
  2. Spanish Government
  3. Junta de Andalucia [DPI2017-84788-P]
  4. Fondo Europeo de Desarrollo Regional (FEDER) y Consejeria de Economia, Conocimiento, Empresas y Universidad de la Junta de Andalucia, dentro del Programa Operativo FEDER FEDER 2014-2020 [P18-FR-4306]
  5. UK Engineering and Physical Sciences Research Council (EPSRC) [EP/S012362/1]
  6. FEDER/Ministerio de Ciencia e Innovacion-Agencia Estatal de Investigacion [PID2020-117407GB-I00]

向作者/读者索取更多资源

In this study, the crack paths of hollow notched samples were analyzed experimentally, and the crack initiation points and directions were observed. The internal crack paths were also determined through the analysis of fracture surfaces. It was found that the crack initiation points were close to the maximum principal stress points at the hole contour, and the crack directions at initiation were generally close to Mode I direction.
Current models for predicting the fatigue endurance of notched solids use the stresses along a straight line, beginning at the notch root, as a simplification of the real crack propagation path. In this work, the experimental crack paths for hollow notched samples were analysed through different microscopy techniques, with the objective of establishing high cycle fatigue crack growth directions in a mild steel. Fully reversed tension-compression fatigue tests (R = -1) of thin-walled tube specimens with a passing-through hole were carried out. The crack paths observed in the outer cylindrical surface were studied in each case, with special attention to the crack initiation point and the crack direction along the first grains. Moreover, the analysis of the fracture surfaces allowed the same analysis to be performed to determine the internal crack paths. It was observed that the crack initiation point was close to the maximum principal stress point at the hole contour as obtained from linear elastic finite element analysis, and the crack direction in its initiation was generally close to Mode I direction, contrary to the conventionally accepted 45 crack growth direction.

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