http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이종형 ( Jong-hyung Lee ),소윤섭 ( Yoon-sub So ),김윤곤 ( Yun-gon Kim ),임춘규 ( Chun-kyoo Lim ),이상영 ( Sang-young Lee ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.1
The objective of this paper is to examine the detection limit, growth characteristics and notch curvature radius in short crack problem. Measurement techniques such as ultrasonic method and back-face strain compliance method were adapted. The fatigue crack growth rate of the short crack is slower than that of a long crack for a notched specimen. The short crack is detected effectively by ultrasonic method. A short surface crack occurs in the middle of specimen thickness and is transient to a through crack when maximum crack depth is larger than the notch curvature radius.
이종형 ( Jong-hyung Lee ),이상영 ( Sang-young Lee ),이창헌 ( Chang-heon Yi ),김윤곤 ( Yun-gon Kim ),임춘규 ( Chun-kyoo Lim ),이춘곤 ( Chun-kon Lee ),권영신 ( Yung-shin Kwon ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.3
Prediction of fatigue duration is attainable from the analysis of the growth rate of the fatigue crack, and the property of the fatigue crack growth is determined by the calculation of the stress intensity factor. And the evaluation of the stress intensity factor, K comes from the stress analysis of the vicinity of crack tip of the continuum. This study describes a simple method to decide the stress intensity factor for the small crack at the sharp edge notches. The proposed method is based on the similarities between elastic stress fields of the notch tip described by two parameters, the stress concentration factor K, the radius of arc of the notch . And it is applicable to the analysis of the semi-elliptical penetration cracks and the edge notches.
Multi-Nozzle Injection Molding Automatic Machine 개발에 관한 연구
이종형 ( Jong-hyung Lee ),김정환 ( Jung-hwan Kim ),이창헌 ( Chang-heon Yi ),김윤곤 ( Yun-gon Kim ),임춘규 ( Chun-kyoo Lim ),이춘곤 ( Chun-kon Lee ),권영신 ( Yung-shin Kwon ) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.2
The demand for the precision rubber products has been rapidly increasing with the recent growth of industries. And the requirement for the productivity and the quality calls out for the injection molding machines with the precision machining ability as well as the high productivity. Especially modern automobile industry is in urgent need of developing injection molding machines for the high quality rubber products with high productivity. And the inability of the domestic companies to meet the standards causes importing foreign machines and as a result spending good amount of dollars. It is extremely important to develop competitive machines and strengthen the infrastructure of the related industries. In this paper the functions and the structure of a automatic multi-nozzle injection molding machine has been studied to set up a proper test system for the precision rate and the reliability of the machines, which can help build the machines to meet the request of the industry.
이종형(Jong-Hyung Lee),이상영(Sang-Young Lee),이창헌(Chang-Heon Yi),김윤곤(Yun-Gon Kim),임춘규(Chun-Kyoo Lim),이춘곤(Chun-Kon Lee),권영신(Yung-Shin Kwon) 한국산업융합학회 2007 한국산업융합학회 논문집 Vol.10 No.4
Most of the fatigue fractures of various machine structures start at discontinuities or small defects. In this study property of crack growth of titanium alloy was also analyzed to investigate the difference compared with the carbon steel. Titanium alloy has very high specific strength, and the material is widely utilized in advanced engineering fields such as aerospace, atomic energy and ocean development because of its excellence in corrosion and heat resistance. Generally the machine structures experience irregular loadings rather than periodic forces. The prediction of the fatigue life therefore has been analyzed to provide fundamentals of the design and estimation of the machine structures under irregular loading conditions.