The Effect of Crack Closure on the Threshold of Micro Fatigue Crack Propagation under Mixed Mode

Plane bending and cyclic torsion tests, and a combination of them are carried out using aged cracked specimens made of carbon steel under the condition of a stress ratio R=-1. Taking account of the residual compressive stress around the crack in Model I and the friction stress acting on the crack su...

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Bibliographic Details
Published inTransactions of the Japan Society of Mechanical Engineers Series A Vol. 52; no. 480; pp. 1733 - 1740
Main Authors KITAOKA, Seiichiro, CHEN, Jian-Qiao, SEIKA, Masaichiro
Format Journal Article
LanguageEnglish
Japanese
Published The Japan Society of Mechanical Engineers 1986
Subjects
Aging
Crack Propagation Threshold
Fatigue
Micro Crack
Mixed Mode
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Summary:Plane bending and cyclic torsion tests, and a combination of them are carried out using aged cracked specimens made of carbon steel under the condition of a stress ratio R=-1. Taking account of the residual compressive stress around the crack in Model I and the friction stress acting on the crack surface in Model II, and adopting the criterion that and aged crack begins to propagate when the circumferential principal stress range reaches a critical value peculiar to the material, the threshold condition of micro fatigue crack propagation under a mixed mode can be deduced from the results of plane bending and cyclic torsion tests.
ISSN:0387-5008
1884-8338
DOI:10.1299/kikaia.52.1733