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용접부 강도불균질을 고려한 원주방향관통균열 배관의 파괴역학 해석법
박보규(Bo Gyu Park),오창균(Chang Kyun Oh),김윤재(Yun Jae Kim),김영진(Young Jin Kim),김종성(Jong Sung Kim),진태은(Tae Eun Jin) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Defective components of interest include not only homogeneous components, but also components with weldments where tensile properties vary across the weldment. Noting that the region near the weldment is the most vulnerable place for crack initiation and subsequent growth, defect assessment methods for homogeneous structure. Moreover, weldment width and crack location also affects the deformation and fracture behavior of the welded joints. These weld characteristics can evaluate using plastic limit load. So in this paper, evaluate plastic limit load both full circumference part-throughwall cracked pipes and circumference through-wall cracked pipes considering weld characteristics. And using evaluate results, proposed J-integral and crack opening displacement(COD) estimate method based on reference stress method.
트레일링 암 생산용 LFT-D 시스템에서의 압축성형 해석
박보규(Bo-Gyu Park),정진우(Jin Woo Jung),정한규(Han-Kyu Jung),박시우(Si-Woo Park),하동수(Dong Soo Ha),최현열(Hyen Yel Choi) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.6
Recently, CFRP composites are widely used as lightweight materials have with excellent mechanical properties and can beare widely used in various fields. In general, thermosetting resins are used for CFRP. However, in recent years, studies have been carried out using thermoplastic resins have been actively carried out to overcome the disadvantages of thermosetting resins. The LFT-D system is a molding method in which a fiber is directly cut to a the desired length while being impregnated with a thermoplastic resin to produce a compound and that is then press-molding molded to form the product. In this paper, before the production of the trailing arm, the compression molding analysis was carried out in order to grasp the problems that may occur during production. Through cCompression molding analysis was applied to calculate of the minimum press pressure and to compare and analysis analyze the molding conditions characteristic required to formfor forming the trailing arm.
가솔린 자동차 터보차져용 WGV head의 금속 분말 사출성형 해석
박보규(Bo-Gyu Park),박시우(Si-Woo Park),박대규(Dae-Kyu Park),김상윤(Sang-Yoon Kim),정재옥(Jae-Ok Jeong),장종관(Jong-Kwan Jang) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The wastegate valve (WGV), one of the essential parts of a wastegate-type turbocharger for automobiles, is a very important part controlling the constant exhaust pressure. WGVs for gasoline vehicles operate in a harsh hightemperature environment. Hence, WGVs are typically made of Inconel 713C, which is a type of Ni-based superalloy. However, investment casting and precision machining are very difficult because of the hardness of the Inconel material. Recently, the metal injection molding (MIM) process has attracted considerable attention for parts used under hightemperature conditions. In this study, an MIM analysis for the head and other parts of the WGV is conducted using a commercial CAE program Moldflow. Further, optimal manufacturing conditions are determined by analyzing flow characteristics at various injection times. Moreover, to improve the accuracy of the analysis results, we compare the actual temperature of the mold during injection processing with that observed through the analysis.
Wire-winding 기법으로 제작된 고압용기의 유한요소 해석
박보규(Bo Gyu Park),이호준(Ho Joon Lee) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The high pressure treatment device is a device for sterilizing food by applying hydrostatic pressure to solid food or liquid food. The ultra-high pressure treatment system consists of pressure vessel, pressure system and other components. Pressure vessels for ultrahigh-pressure processing equipment shall have durability to withstand pressures of several thousand atmospheres. One of the most common techniques for high pressure vessel design is the wire winding technique. The process consists on surrounding a cylinder with a flat wire made of high strength steel. In this way, residual initial compressive stresses in the core of the vessel, in contact with the internal pressure, increase the fatigue life of the installation. Current design codes, as the ASME code (2007 Section VIII - Division 3) include special design requirements as a safety factor against plastic collapse. In particular, this code requires that the analysis shall be performed using numerical methods for cylindrical vessels that have an inner-outer diameters ratio greater than 1.5. In this work, a wire winding simulation methodology for the analysis of high pressure vessels is presented.
박보규(Bo Gyu Park),김영일(Young Il Kim),김윤재(Yun Jae Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Analytical limit load solutions are available for straight pipes with circumferential and axial part-through wall cracks, subject to internal pressure, axial tension and global bending. Such solutions are based on equilibrium stress fields, and thus are lower bounds. Although it is believed that such lower bound solutions for cracked pipes would be better for pipes with local wall thinning, it has been reported that they are not appropriate. Noting that accurate limit load solutions are essential for residual strength and life estimates, detailed finite element (FE) limit analysis is performed for straight pipes with local wall thinning, subject to internal pressure, axial tension and global bending. Practically interesting ranges of pipe and defect geometries are considered. Based on the FE results, closed-form approximations of limit loads are proposed. Finally implication of the developed limit load solutions to defect assessment of locally wall-thinned pipes is discussed.
가솔린 자동차 터보차져용 WGV Head의 금속 분말 사출성형 해석
박보규(Bo-Gyu Park),박시우(Si-Woo Park),박대규(Dae-Kyu Park),김상윤(Sang-Yoon Kim),정재옥(Jae-Ok Jeong),장종관(Jong-Kwan Jang) 한국자동차공학회 2015 한국 자동차공학회논문집 Vol.23 No.4
The waste gate valve (WGV) for gasoline vehicles operate in a harsh high-temperature environment. Hence, WGVs are typically made of Inconel 713C, which is a type of Ni-based superalloy. Recently, the metal injection molding (MIM) process has attracted considerable attention for parts used under high-temperature conditions. In this study, an MIM analysis for the head and other parts of the WGV is conducted using a commercial CAE program Moldflow. Further, optimal manufacturing conditions are determined by analyzing flow characteristics at various injection times and locations. Moreover, to improve the accuracy of the analysis results, we compare the actual temperature of the mold during injection processing with that observed through the analysis. As the results, metal injection patterns of analysis are well in accord with these of short shot test. And the temperature variations of analysis is also very similar with those of feedstock when metal injection molding.