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Effects of defence holes on notched strength and fatigue properties in plain woven composite
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 Title & Authors
Effects of defence holes on notched strength and fatigue properties in plain woven composite
Kim, Jung-Kyu; Shim, Dong-Suk; Han, Min-Gyu;
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 Abstract
The relaxation of stress concentration in notched members can be very significant in the improvement of notched strength and fatigue life. This paper investigated the relationship of stress concentration factor, and notched strength and fatigue life. The stress concentration factors were analyzed by FEM. Uniaxial tensile and fatigue tests were carried on plain woven composite specimens which have a main hole and two defence holes. From experimental results, the notched strength and the fatigue limit increased up to about 50% and 30% respectively due to the reduction in stress concentration. The fatigue lives predicted by Juvinall's approach were underestimated than test results and this trends were remarkable as nothed strength increased. This is because of the underestimation of a coefficient. A in S-N curve (.sigma. =A ). Therefore, considering notched strength the coefficient A was modified. The fatigue lives by this process were agreed well with the experimental results.sults.
 Keywords
Stress Concentration Factor;Main Hole;Defence Hole;Notched Strength;Fatigue Life;
 Language
Korean
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