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변후(變厚)용접판재에서의 피로균열성장거동에 미치는 잔류응력의 영향에 관한 파괴역학적 연구
차용훈 한국산업안전학회 1993 한국안전학회지 Vol.8 No.1
The welding implementation used widely in the industrial field is gradually increasing due to weight reduction unlimited material thickness simplified structure design, and 1 manufacturing time and cost reduction. The most significant factor that influences the fatigue crack growth rate is the residual stress generated during the welding process. Many researchers have studied the effect of the residual stress on crack growth behavior. Through a fatigue test in a various-thickness welded specimen redistributed residual stress is measured as the crack is developed. Then, by superposing the measured residual stress on the K value obtained by the finite element method.
압력용기 보강재의 용접 형태에 따른 피로균열성장 거동에 관한 연구
차용훈,김하식,성백섭 한국산업안전학회 2000 한국안전학회지 Vol.16 No.3
The study is to investigate the influence on the fatigue crack growth behaviors for the welded configuration in pressure vessel stiffener. In order to perform this goal, the automatic welded specimens were prepared. The material is ASTM A516 grade 60 steel used in pressure vessel mainly. In skip welding of pad-on-plate, continuous fillet welding and PWHT specimen, fatigue crack is generally initiated at the starting and end weld toe zone, and ruptured at the starting weld toe zone. The fatigue life of pad-on-plate of the continuous fillet welding specimen is larger than that of pad-on-plate skip fillet welding specimen about 85% under low load, about 20% under high load, and less than that of two-pad continuous fillet welding specimen about 85%. In da/dN-ΔK curve under low load, skip fillet welding specimen of pad-on-plate showed retardation on the initial crack, and the fatigue crack growth rate at the low region of ΔK greater specimen E(3.8 × 10^(-6) ㎜/cycle). And the fatigue life of welding specimen was smaller than that of PWHT specimen.
차용훈,성백섭 朝鮮大學校 機械技術硏究所 2001 機械技術硏究 Vol.4 No.2
Today manufacturing industries are at the threshold of utilizing innovative and improved computer related technologies for the betterment of manufacturing industries. Characteristics of the present world market include demanding and sophisticated customers, requirement of high quality and innovative products, greater product diversity, increasing labour and products costs, availability of diverse alternatives to the customers and smaller batch sizes to satisfy a variety of customer profiles. To fulfil these characteristics, manufacturing companies need to be flexible adaptable, proactive and able to produce variety of products in short time at low cost. The aim of this research is to develop a computer-aided design system for water-gate on AutoCAD R2000 system. The developed system has been written in AutoCAD and VisualLISP with a personal computer, and is composed four modules which are the gate-lifter input module, guide-frame input module, template input module and upgrade module. Based on knowledge-based rules, the system is designed by considering several factors, such as width and height of a water-gate, material, object of product and maximum depth of water.
알루미늄 合金 熔接部의 疲勞龜裂成長擧動에 關한 破壞力學的 硏究
차용훈,김덕중 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.3
the objective of this study is to investigate the influence of welding residual stresses on the fatigue crack growth behavior of cracks located transverse to the weld bead. For this purpose G.T.A. (Gas Tungsten Arc) welding was performed on the A1 alloy 1100-O plate and the same initial crack is made on HAZ(Heat Affected Zone), weld metal and base metal respectively. Specimens were used CT(Compact Tension) specimens. Initial welding residual stresses were measured by using strain gage sectioning method. All specimens were tested under constant amplitude load with stress ratio R=01, It is possible to predict fatigue crack growth behaviors and the fatigue life, using numerical analysis together with distribution of initial residual stress and the values of C and m obtained from da/dN-ΔK
차용훈,김범준,김창완,남경식,이두연,함석진 대한흉부외과학회 2010 Journal of Chest Surgery (J Chest Surg) Vol.43 No.6
The pneumomediastinum after a dental treatment occurs rarely and shows almost good prognosis, however it is potentially life-threatening complication. Here we report a case of pneumomediastinum, occurred by air bubbles originated from dental high speed equipment, via head and neck fascial space with literatures review. 치과 시술 후 발생하는 종격동 기종은 비록 발생 비율이 낮고 예후가 양호하지만 잠재적으로 생명을위협하는 합병증을 초래할 수도 있다. 저자들은 치과 치료 시에 고속 핸드피스에 의해 발생한 공기가두경부 근막 공간을 통해 종격동까지 전파된 증례를 치험 하였기에 문헌고찰과 함께 보고하는 바이다.
알루미늄 合金 熔接材의 疲勞破壞에 미치는 殘留應力의 影響에 關한 硏究
차용훈,김하식,김덕중 한국공작기계학회 1995 한국생산제조학회지 Vol.4 No.4
This study is to inspect the influence of the initial residual stress on fatigue crack growth behavior after the distribution of the initial residual stress is measured when the crack is growing from the compressive residual stress field to the tensile residual stress field. Also, the influence of the variation of residual stress distribution on fatigue crack growth behavior at the crack tip is studied when the initial crack occurs on weld metal, bead interface and HAZ (Heat Affected Zone), respectively. For this purpose, CT-type specimen that crack parallel to the welding bead were manufactured by butt welding on the Al. Alloy 1100-O plate.
차용훈,김하식 한국산업안전학회 1996 한국안전학회지 Vol.11 No.4
In studying the fatigue strength of fillet welded the section of pressure vessel pad, this study was to evaluate the effect of weld toe notch and to compare the results of numerical analysis with the results of fatigue experiments of fillet welded A516 grade 60 steel specimens. The fatigue life for the Bead welded specimen was about 1.4 times as much it as the Wad welded specimen. Also, The fatigue life for the 2Pad welded specimen was about 1.5 times as much it as the 1ad welded specimen. In da/dN-ΔK curve, the fatigue crack growth rate for the lead welded specimen appeared higher than that of the 2Pad welded specimen in the same initial region of ΔK, had a similar inclination in the stabled region.
車龍勳,吳定國 조선대학교 생산기술연구소 1992 生産技術硏究 Vol.14 No.2
The welding implementation used widely in the industrial field is gradually increasing due to weight reduction, unlimited material thickness, simplified structure design, and manufacturing time and cost reduction. The most significant factor that influences the fatigue crack growth rate is the residual stress generated during the welding process. Many researchers have studied the effect of the residual stress on crack growth behavior. Through a fatigue test in a various-thickness welded specimen, redistributed residual stress is measured as the crack is developed. Then, by superposing the measured residual stress on the K value obtained by the finite element metnod.
高張力鋼 被服 아아크熔接에서의 入熱量의 影響에 관한 硏究
차용훈,정종안 조선대학교 동력자원연구소 1992 動力資源硏究所誌 Vol.14 No.2
To study the effect of heat input on cracking ratio of high tensile strength steel weld metal, Y groove cracking test method was adopted and the samples were prepared by manual welding. Then the cracking ratio, microstructure and fracture surface were examined. The obtained results are as follows: 1. As heat input is increased, the hardness of fusion line in weld metal is decreased, but the hardness is increased. 2. As heat input is increased, the metal structure of HAZ consists of pearlite and ferrite. 3. Increasing the heat input results in the grain growth and the brittle fracture.