Sociedad Española de Integridad Estructural
Grupo Español de Fractura

Sociedad Española de Integridad Estructural
Grupo Español de Fractura

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SHEAR-CRACK GROWTH IN COPPER PROCESSED BY EQUAL CHANNEL ANGULAR PRESSING UNDER CYCLIC STRESSES

M. Goto  K. Morita  S. Z. Han  T. Yamamoto  J. Kitamura  J.H. Ahn2  S. Kim  J. Lee

Anales de la Mecánica de la Fractura, nº 32 . 2015 . Pág. 31 -36
Ver (.pdf): Anales32-004

Resumen: In strain-controlled low-cycle fatigue tests of ultrafine grained copper, it has been shown that the shear-bands and crack growth paths were oriented at 45° to the loading axis parallel to the longitudinal axis of the pressed samples. Many investigators have studied the formation mechanism of shear-bands over a few decades, however little has been studied on the growth mechanism of a 45° inclined crack. In the present study, stress-controlled fatigue tests of round bar specimens with a small hole as a crack starter were conducted under a high stress amplitude corresponding to low-cycle fatigue regime. The growth paths of cracks from the hole were inclined 45° to the loading-axis. This was because of the shear banding induced by the maximum shear stress and shear-bands decohesion process. Profile of crack face was examined, showing the aspect ratios (b/a) of b/a = 0.38. The role of deformation mode at the crack tip areas on surfacecrack growth behavior were discussed in terms of the mixed-mode stress intensity factor.

LocalizaciónZamora

Department of Mechanical Engineering, Oita University, Oita, 870-1192, Japan
Department of Mechanical Engineering, Oita University, Oita, 870-1192, Japan
Materials Engineering. Department, Korea Institute of Materials Science, Changwon, Republic of Korea
Department of Mechanical Engineering, Oita University, Oita, 870-1192, Japan
Department of Mechanical Engineering, Oita University, Oita, 870-1192, Japan
Materials Engineering. Department, Korea Institute of Materials Science, Changwon, Republic of Korea
Department of Materials Science and Engineering, Gyeongsang National University, Chinju, Republic of Korea
Department of Metallurgy and Materials Engineering, Changwon National University, Changwon, Republic of Korea

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