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THE EFFECT OF R-RATIO AND INITIAL ANGLE OF CRACK ON FATIGUE PARAMETERS IN FATIGUE CRACK GROWTH UNDER MIXED MODE I-III

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Author(s): J. E. JAM | NASER OMIDVAR GHAZIANI | NAVID OMIDVAR GHAZIANI

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 10;
Start page: 7614;
Date: 2011;
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Keywords: Mixed-mode I-III | plate with edge crack | stress intensity factor | J-Integral | fatigue crack growth.

ABSTRACT
This study considers the numerical and experimental fatigue crack growth under mixed mode I-III in a holed plate with edge crack (Modified Compact Tension Specimens) which made of aluminum alloy 7017 under simple tensile-tension loading. R-ratio (0.01, 0.02) and first angle of crack (30 ,45 ,60 ) are variable. Their effects on Stress Intensity Factor (KI ,KIII ) and J-Integral (JI , JIII ) for both of Fracture mode during the fatigue crack growth has been studied. Also the fatigue crack growth vs. stress intensity factor and J-Integral diagrams has been found and compared to experimental results which show that enhancement in crack angle issues augmentation in mode III and reduction in mode I. In a constant angle, during the crack growth the effect of Mode III will decrease and Mode I will increase. Finally by enhancement in first angle in same crack length, the fatigue crack growth life will increase.
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