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유한요소법을 이용한 CT 시편의 홀확장 잔류응력 및 응력확대계수 해석
장재순,양원호,김철,고명훈,조명래,Jang, Jae-Soon,Yang, Won-Ho,Kim, Cheol,Ko, Myung-Hoon,Cho, Myoung-Rae 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.5
Cold expansion method is retarded of crack initiation due to the compressive residual stress developed on the hole surface. Previous research has just been study about residual stress distribution in the hole surrounding. But, The purpose of this study was to improve the understanding of the residual stress effect in hole surrounding as crack growth from another hole. In this paper, it is shown that residual stress is redistributed due to the application of cold expansion process for CT specimen using finite element method. It is further shown that tensile stress increases in proportion to cold expansion ratio in the vicinity of crack. It is thought that stress intensity factor increases with cold expansion ratio.
장재순,양원호,김철,Jang, Jae-Soon,Yang, Won-Ho,Kim, Cheol 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.8
The purpose of this study is comparing cold expansion method with interference fit. Cold expansion method and interference fit of fastener hole is using in the aerospace industry. These treatment lead to an improvement of fatigue life to the compressive residual stresses developed on the hole surface. But Research is nothing to about difference effect of between cold expansion method and interference fit. So, this paper, it is shown that Comparing cold expansion method with interference fit using the finite element method. It is further shown that residual stress distribution according to plate thickness and clamping force.