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coaxing 효과가 피로한도에 미치는 영향에 관한 연구
이종형(Jung-Hyoung Lee),유덕상(Duck-Sang Yoo),송득중(Deuk-Chung Song) 한국산업융합학회 2002 한국산업융합학회 논문집 Vol.5 No.1
In the field of design of mechanical structure and expectation of life time, characteristic of fatigue limit comes out to he the most important problem. In this paper, in order to get fatigue limit, ( I ) investigate the aspects of economy, time and confidence comparing two methods: the method by fracture probability introducing statistical conception and the staircase method. And (Ⅱ) examine the experience approaching fatigue limit and coaxing effect. The value of fatigue limit by staircase method in very effective in view of practical use, and coaxing comes out by the same material effect as restraining crack progress, not as strengthening the tip of crack alone.<br/> <br/>
보론 첨가강의 경화기구에 따른 기계적 성질에 관한 연구
이종형(Jong-Hyung Lee),유덕상(Duck-Sang Yoo),박신규(Shin-Kyu Park) 한국산업융합학회 2003 한국산업융합학회 논문집 Vol.6 No.4
This research is for the relationship with heat treatment cooling temprature and the characteristic of Mechanical properties of Boron-Addition-Steel, the main material and SM25C steel, the sub material, structure viewing fractography, hardness test, tensite test and are carried out after the manufacturing small-specimen treated with heat of 750℃, 850℃, 1050℃. The influence to the Mechanical properties accompanied by AISI51B20, Boron-Addition-steel shows the following result.<br/> 1. The influenc of heat treatment by the content of cabon-steel is dominant. Addition of boron result is Strengthening structure effectively by segregation and improving over all mechanical characters such as good. it results from the increase of temacity by the stability of inter granular with improvement of harden-ability.<br/> 2. Boron-Addition-Steel exist in the from of martensite structure accompanied by the ferrite precipitition centering around grain boundary, and is improved to Hv 200.<br/> 3. The height of harden-ability and fatigue stress the influence of heat results from crystal structure of martensite by difference of strength level in the structure of ferrite and doesn't have am effect on sensibility of temperature, and turns out to defend on production and growth of Matrix-structure-factor.
이종형 ( Jong-hyung Lee ),정형식 ( Hyung-sik Jeong ),유덕상 ( Duck-sang Yoo ),김영문 ( Young-moon Kim ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.2
This paper is to provide some of the analysis procedures of the FAD(Failure Assessment Diagram), which is applied th the safety test of the atomic pressure vessels and other structures. Harrison proposed R-6 Diagram, and Bloom developed the method of DPFAD(Deformation Plasticty Failure Assessment Diagram). Analysis of J-integration of the plastic materials give the failure test curve for the materials with serious work hardening effect. J value was obtained form both FEM(Finite Element Mothod) and the experiment using compact type specimen for J=JIC, and the results were compared. In this study, the results of analysis using DPFAD and the factors affecting DPFAD in Static fatigue and fracture were reviewed. It was shown that the concept of DPFAD can be applied to test the safety of the structures.
자동차 VALVE HOUSING용 2-CAVITY 다이캐스팅의 충전 현상 분석
이종형 ( Jong-hyung Lee ),윤종철 ( Jong-cheul Yoon ),유덕상 ( Duck-sang Yoo ),이창헌 ( Chang-heon Lee ),하홍배 ( Hong-bae Ha ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.1
In perspective of saving natural resource and energy, today’s automobiles are in process of regenerating by smaller and lighter. In order to achieve the sufficiency on the consumption of the fuel, new mechanism and new assembly are required. Therefore the expectations on the new materials are very high. Especially, AI materials are widely used to reduce the weight. AI that is used in automobiles is mostly casting material, and according to the innovation of technique is in rapid development. AI Die casting is an important field as today’s trend of lightweight on automobiles. One of the parts in steering system, Valve Housing plays a role of reduce the operating effort of drivers. Unfortunately, the Valve Housing which is widely reliable to the most automobiles are not developed at this moment in our automobile industry. Therefore, they are produced by casting method which cost three times or even more expensive in production. If Valve Housing, which is a part of steering system is produced by Gravity Casting, the space that manufacturing equipment will be increased, and more time and workers would be brought into service. For such reason, Die Casting would replace Gravity Casting in order to minimize cost of time, manpower, and working space.
2CAVITY 다이캐스팅을 이용한 자동차 VALVE HOUSING의 기계적 특성 해석
이종형 ( Jong-hyung Lee ),윤종철 ( Jong-cheul Yoon ),유덕상 ( Duck-sang Yoo ),이창헌 ( Chang-heon Lee ),하홍배 ( Hong-bae Ha ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.2
Valve-housing parts in car steering system is a part of steering system and then take charge of the main functions for car steering system to reduce driver's handling-force. Recently it is still not developed reliable casting for many cars, so it produce as a Gravity casting which is more than triple for producing cost in Korea. In this research, we had conducted that 350t aluminum die casting is superior to mechanical property from established over 500t or not for Valve-housing, a parts of steering system which were produced as a cast-iron product and the most suitable conditions to extruding as die casting.