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김민헌(Min-Heon Kim),박환성(Hwan-Seong Park),김동규(Dong-Kyu Kim),남기우(Ki-Woo Nam) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
Fatigue fracture is the result of repetitive cyclic short-time stress or tensile stress, or deformation well below the tensile or flexural strength of the material. In order to use the structure safely, it is necessary to predict the life of small cracks. In this study, using Ando formula considering plastic deformation, fatigue limit was evaluated by comparing the results of Nakagawa et al. Since the fatigue limit of the surface crack should be evaluated as the crack with the larger stress intensity factor, As = 1.0 should be evaluated as surface, and As = 0.4 should be evaluated as depth. At this time, evaluation by equivalent crack length showed good agreement.
김민헌(Min-Heon Kim),박환성(Hwan-Seong Park),김동규(Dong-Kyu Kim),남기우(Ki-Woo Nam) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
This study is to evaluate the harmless crack size according to the compressive residual stress as a basic study to evaluate the safety of hydrogen storage tank. The harmless crack dimension depends on the residual stress and the crack aspect ratio(As). As = 1.0 and 0.6 were determined as crack depth at large residual stresses and crack lengths at medium and small residual stresses. As = 0.3 was determined as the crack depth regardless of the magnitude of the residual stress. The harmless crack size by shot peening was different depending on the residual stress and the crack aspect ratio.
윤서현,김민헌,남기우 한국산업융합학회 2019 한국산업융합학회 논문집 Vol.22 No.6
Fracture behaviors of SCM435 high strength bolt have been studied including macroscopic and microscopic fracture observation, Energy Dispersive X-ray Spectroscopy, Vickers hardness test and applied stress evaluation. cracks (ratchet marks) were generated by the repetitive loads acting on the bolts, initial stress of bolt and the stress concentration. The applied stress was found to be slightly higher than the fatigue limit of the material. The initial stress of bolt must be removed, and the mold temperature during the process must be maintained by room temperature. Bolts are recommended to be peened to improve fatigue limit.
외이도를 침범한 연조직염 및 악성종양으로 오인된 만성 활성형 엡스테인바 바이러스 감염증 1예
이주형,김민헌,권동환,공태훈 대한이비인후과학회 2023 대한이비인후과학회지 두경부외과학 Vol.66 No.4
Epstein-Barr virus (EBV) is an extremely prevalent virus which infects over 90% of the glob-al population at some point in their lifetime. Chronic active EBV infection (CAEBV) is a dis-ease with a high mortality rate with life-threatening complications. Although the main symp-tom of CAEBV is inflammation, most patients present with fever, hepatic dysfunction with orwithout hepatomegaly, splenomegaly, lymphadenopathy, thrombocytopenia, anemia, hyper-sensitivity to mosquito bites, rash, oral ulcers, hemophagocytic syndrome, coronary arteryaneurysms, and interstitial pneumonia. Although some cases of CAEBV with other organsymptoms have been reported, CAEBV of external auditory canal and parotid gland is ex-tremely rare. We report a case of CAEBV infection mimicking cellulitis or malignancy diag-nosed after a number of biopsies in a patient who presented with a mass accompanied by in-flammation in the external auditory canal.