http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
리플로 납땜 공정에서 플라스틱 IC 패키지의 습기 및 열로 인한 파손문제 해석
이강용,이택성,이경섭,Lee, Kang-Yong,Lee, Taek-Sung,Lee, Kyung-Seob 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.4
The purpose of this paper is to evaluate the delamination and fracture integrity of the IC plastic package under hygrothermal loading by stress analysis and fracture mechanics approaches. The plastic SOJ package with a dimpled diepad under the reflow slodering process of IR heating type is considered. On the package without a crack, the stress variation according to the change of the design variables such as the material and shape of the package is calculated and the possibility of delamination is considered. For the model fully delaminated between the chip and diepad, J-integrals are calculated for the various design variables and the fracture integrity is discussed. From the results, optimal design values of variables to prevent the delamination and fracture of IC package are obtained. In this study, FDM program to obtain the vapor pressure from the content of moisture absorbed into the package is developed.
이강용,김종성,배정일,진태은,염학기,홍승열,정일석,김유,Lee, Kang-Yong,Kim, Jong-Sung,Bae, Jung-Il,Jin, Tae-Eun,Youm, Hak-Ki,Hong, Seong-Yul,Jeong, Il-Suk,Kim, Yoo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
The procedure for the determination of the residual life of the pressurizer surge line nozzle in the nuclear plant is developed. The design fatigue life for the 1800 $ft^3$ pressurizer surge line nozzle in cast head design is compared with that of Westinghouse stress report, and the percentage difference between two results is less than 9%. The design fatigue life evaluation of the 1000 $ft^3$ pressurizer surge line nozzle in fabricated head design is carried out, and the consuming rate and residual life are estimated using the operating data.
혼합형 하중항에 있는 판재로 보강된 균열판의 응력세기계수
이강용,김옥환,Lee, Kang-Yong,Kim, Ok-Whan 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
The mode I and II stress intensity factors have been calculated theoretically for the cracked plate reinforced with a plate by symmetric spot welding under remote mixed mode loading. This is the extension of authors' previous work for the reinforced cracked plate under remote normal stress. Regardless of loading types, the reinforcement effect gets better as one joining spot is closer to the crack tip and the others are closer to the crack surface, and optimum number of the joining spots can be existed. For the present model, the remote loading parallel to crack surface produces the mode I stress intensity factor.
경계요소법을 이용한 수직열유동을 받는 접합경계면 커스프균열의 열응력세기계수 결정
이강용,백운천,Lee, Kang-Yong,Baik, Woon-Cheon 대한기계학회 1993 대한기계학회논문집 Vol.17 No.7
The thermal stress intensity factors for interface cracks of Griffith and symmetric lip cusp types under vertical uniform heat flow in a finite body are calculated by boundary element method. The boundary conditions on the crack surfaces are insulated or fixed to constant temperature. The relationship between the stress intensity factors and the displacements on the nodal point of a crack tip element is derived. The numerical values of the thermal stress intensity factors for interface Griffith crack in an infinite body and for symmetric lip cusp crack in a finite and homogeneous body are compared with the previous solutions. The thermal stress intensity factors for symmetric lip cusp interface crack in a finite body are calculated with respect to various effective crack lengths, configuration parameters, material property ratios and the thermal boundary conditions on the crack surfaces. Under the same outer boundary conditions, there are no appreciable differences in the distribution of thermal stress intensity factors with respect to each material properties. But the effect of crack surface thermal boundary conditions on the thermal stress intensity factors is considerable.
크립재료의 균열형상 강체함유물에 대한 새로운 파괴역학 매개변수 개발
이강용,김종성,Lee, Kang-Yong,Kim, Jong-Sung 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.12
The analysis model is the infinite power law creep material containing the rigid inclusion with crack shape. The present analysis is performed using the complex pseudo-stress function method. The strain rate intensity factor is developed as new fracture mechanics parameter which represents the stress and strain rate distribution near a crack tip in power law creep material. The strain rate intensity factor is developed in terms of Kolosoff stress functions.
균일한 면외 전단하중을 받는 직교 이방성 적층재 내부 중앙균열의 모드 III 응력세기계수
이강용,주성철,김성호,Lee, Kang-Yong,Joo, Sung-Chul,Kim, Sung-Ho 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.6
A model is constructed to evaluate the mode III stress intensity factor(SIF) for orthotropic three-layered material with a center crack subjected to uniform anti-plane shear loading. A mixed boundary value problem is formulated by Fourier integral transform method and a Fredholm integral equation of the second kind is derived. The integral equation is numerically analyzed to evaluate the effects of the ratio of shear modulus, strength of each layer and crack length to layer thickness on the stress intensity factor.
구름 및 미끄럼 접촉하의 중공원판의 표면하층균열에 대한 J-적분
이강용,김준엽,Lee, Kang-Yong,Kim, June-Yeop 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.7
J-integral for a subsurface horizontal crack in a circular plate with an inner hole under rolling line contact is evaluated according to loading positions with various load conditions, crack length and crack location. Two-dimensional crack is modeled, and the relation between Tresca stress for uncracked model and J-integral is discussed. The loading location which gives the maximum J-integral depends on load condition and crack location, and the presence of friction force increases Tresca stress and J-integral near the surface. Regardless of friction force, crack location that gives maximum J-integral is the same as that of maximum Tresca stress in an uncracked model, and the value of J-integral is propotional to crack length. It is also showed that the variation of an inner radius of a disk does not effect J-integral value.
강재의 재가열공정시 내부 균열에 대한 C(t)-적분의 평가
이강용,김종성,이효진,박성호,Lee, Kang-Yong,Kim, Jong-Sung,Lee, Hyo-Jin,Park, Sung-Ho 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
The crack problem of continuous casting slab due to the thermal stresses during the reheating process is analyzed using FEM. In this study, the C(t)-integral is calculated. As a result, the values of the C(t)-integral decrease by increasing the initial temperature of the slab and decreasing total heat flux. And those decrease by decreasing the heat flux of pre-heating zone and increasing the heat flux of heating zone.