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우창기(C.K.Woo),이장규(Z.K.Rhee) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
In this paper, stress aging effects of aging stress. aging temperature and aging time on the rotary bending fatigue fracture behavior for the SM45C were investigated. The stress aging treatment is a well known technology for the increment of elastic strength and yield strength without losing toughness in alloys by applying the external load under the conditions with the optimum values of stress. temperature and time. The optimal stress aging treatment conditions in these experiments are the stress of 3.38 MPa. the temperature of 300℃ and the time of 5 hours. The results show that the fatigue limit increased about 30.0% under rotary bending fatigue test.<br/>
백열선,이장규,우창기 한국산업안전학회 1999 한국안전학회지 Vol.14 No.4
In this paper, A circular arc crackered plate in biaxially stretched sheets was investigated in the boundary element method. The applications of fracture mechanics have traditionally concentrated on crack problems under an mode I, straight crack. However, many service failures occur from growth of cracks subjected to mixed mode Loadings. A rectangular plate with arc crack or slanted central crack, under biaxial tensile loading, was treated analytically and also solved numerically. The Results from BEM applying different loading conditions, crack length (a/W), arc angle(α) are presented and discussed The stress intensity factors are evaluated by the techniques of the J-integral. The decomposition method, used to decouple the stress intensity factors in mixed mode problems, is implemented by a considering a small circular contour path around each crack tip. The BIE method was successfully applied to a circular arc crackerd plate problem, also slanted centre cracked plate under mixed mode.