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유리섬유 보강 EP 소재의 피로거동에 미치는 Hole Notch의 영향
이정무(Jeong-Moo Lee),서기정(Ki-Jeong Seo),이은동(Eun-Dong Lee),김태진(Tae-Jin Kim),이언석(Eon-Seok Lee) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper reports on an investigation into the effect of hole notches on the injection molded specimens. In order to evaluate the effects of stress concentration and interaction on fatigue behavior, holes were introduced as notch to simple specimen. The material was used in mPPO. Fatigue tests were conducted at 1-hole notch and 2-hole notch specimens. Also, the FEMFAT was used to predict the fatigue life of different hole notch type conditions. The increase of diameter and quantity of hole notch reduced the fatigue strength and fatigue life. As the distance and angle between two holes increase, the fatigue life of the specimen increases. The prediction of FEMFAT gives valid results by considering the various factors of fatigue effect.
VIT(Visual Image Tracing) 기법을 이용한 구리 박막의 탄성계수 및 Poisson 비 측정
한승우(Seung-Woo Han),이상주(Sang-Joo Lee),서기정(Ki-Jeong Seo),김재현(Jae-Hyun Kim),이학주(Hak-Joo Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
It is quite difficult to accurately measure the mechanical properties of thin film. In this research, we have studied with the emphasis on developing mechanical measurement systems to directly measure strains micro/nano-scale thin films using visual image tracing (VIT). For this purpose, we developed micro tensile testing VIT system. It consists of a piezo actuator, load cell, microscope and CCD cameras. The advantage using this method is to monitor the real time image of deformed specimen and to measure Young’s modulus and Poisson’s ratio at the same time. In this paper, Stress-strain curve, Young’s modulus and Poisson’s ratio of copper thin film can be measured using VIT.
원공 결함을 갖는 CTS 시험편의 혼합모드 하중 하에서의 피로균열 전파거동
송삼홍(Sam-Hong Song),신승만(Seung-Man Shin),이정무(Jeong-Moo Lee),서기정(Ki-Jeong Seo) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this study, the propagation behavior of fatigue crack effected hole defects was investigated under<br/> mixed-mode I+II loading. To create mixed-mode stress field at crack tip, the compact tension shear (CTS)<br/> specimen and loading device were used in this tests. The propagation experiments of fatigue crack were<br/> performed by changing of the loading application angle(Ø) and the distance(L) estimated from pre-crack tip<br/> to hole center located side by side by side with a pre-crack. As L changes, the variation for propagation aspect<br/> of fatigue crack, fatigue life and crack propagation rate were examined under mixed-mode loading. Under<br/> mixed-mode loading, the propagation rate of fatigue crack increased while the propagation direction changed<br/> dramatically because of the interference of hole defects.