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에너지 방출률에 의한 접착이음의 계면균열에 대한 파괴인성의 평가
정남용,이명대,강삼근,Jeong, Nam-Yong,Lee, Myeong-Dae,Gang, Sam-Geun 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.9
In this paper, the evaluation method of interfacial fracture toughness to apply the fracture toughness was investigated in adhesively bonded joints of AI/Ced./A1. Four types of adhesively bonded double-cantilever beam(DCB) joints with the interface crack were prepared for the test of interfacial fracture toughness. The experiments to measure the interfacial fracture toughness were performed under the various mixed-mode conditions. The critical energy release rate, Gc, was obtained by the experimental measurement of compliances. From the experimental results, the interfacial fracture toughness for the mixed-mode specimens is well characterized by the energy release rate, and the method of strength evaluation by the interfacial fracture toughness was discussed in adhesively bonded joints.
DCB 접착이음에 대한 응력세기계수의 해석 및 파괴인성의 평가
정남용,이명대,강삼근,Jeong, Nam-Yong,Lee, Myeong-Dae,Gang, Sam-Geun 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.6
In this paper, an evaluation method of fracture toughness to apply interfacial fracture mechanics was investigated in adhesively bonded double-cantilever beam (DCB) joints. Four types of adhesively bonded DCB joints with an interface crack were prepared for analyses of the stress intensity factors using boundary element method(BEM) and the fracture toughness test. From the results of BEM analysis and fracture toughness experiments, it is found that the stress intensity factor, K1 is a parameter driving the fracture of adhesively bonded joints. Also, the evaluation method of fracture toughness by separated stress intensity factors of mixed mode cracks was proposed and the influences of mode components for its fracture toughness are investigated in adhesively bonded DCB joints.
초음파 탐상법을 이용한 접착이음에 대한 계면 균열의 검출
정남용,박성일,이명대,Jeong, Nam-Yong,Park, Seong-Il,Lee, Myeong-Dae 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.3
In is well recognized that the ultrasonic method is one of the most common and reliable nondestructive testing(NDT) methods for the quantitative estimation of defects in welded structures. However, NDT techniques applying for adhesively bonded joints have not been clearly established yet. In this paper, the detection of interface crack by the ultrasonic method was applied for the measurement of interface crack length in the adhesively bonded joints of double-cantilever beam(DCB). The optimum condition of transmission coefficients and experimental accuracy by the ultrasonic method in the adhesively bonded joints have been investigated. The experimental values are in good agreement with the computed results by boundary element method(BEM) and Riplings equation.
정남수 ( Nam Su Jung ),이지민 ( Ji Min Lee ),이정재 ( Jeong Jae Lee ) 한국농촌계획학회 2004 농촌계획 Vol.10 No.2
According to the growing concerns of the public with efficiency and effects of regional policies, their assessment works have become an important issue. Up to now, several studies have been carried out on economic effects of policies using conventional cost/benefit analysis, while there have been few studies on assessment of amenity oriented policies. From the above consideration, this study tried to develop An Annual Expenditure Assessment Model (AEAM) for amenity-oriented policy-making in rural area. As a pre-work for model development, the hierarchical indices system for rural development and the classification system of expenditure were designed. Being based on high significant relationship between rural amenities and local government expenditure, a linear optimization model for maximization of regional amenity was constructed. Through a case study of Sunchang-gun, Chonbuk-province, the model applicability was ascertained.
노령화사회에 대비한 농촌지역 장수도의 정의 및 장수지역 기준마련에 관한 연구
정남수 ( Jeong Nam Su ),이정재 ( Lee Jeong Jae ),김한중 ( Kim Han Jung ),이지민 ( Lee Ji Min ),서교 ( Seo Gyo ),이호재 ( Lee Ho Jae ) 한국농촌계획학회 2003 농촌계획 Vol.9 No.3
In this study, the longevity index was suggested for researches about social and environmental effects to human immorality and criteria for defining longevity area were developed using statistical analysis. Candidates indexes based on researches about the trend of human death ratio were investigated. As a result statistical analysis ratio of population over 85 years old and over 65 years was selected as a longevity index. Statistical analysis on the longevity distribution at each district showed that `eup` and `myun` are appropriate spatial unit to study social and geographical characteristics of longevity. The spatial analysis using the ArcView^(TM) with the suggested index shows the time dependent variances of degree of immorality and spatial relationship between degree of immorality and human migration.
정남수,최원,이호재,김한중,이정재,김종옥,Jung , Nam-Su,Choi, Won,Lee, Ho-Jae,Kim , Han-Joong,Lee , Jeong-Jae,Kim, Jong-Ok 한국농공학회 2004 한국농공학회논문집 Vol.46 No.5
Methodologies of the finite element and boundary element are combined to achieve an efficient and accurate analysis model of frame structure containing shear wall. This model analyzes the frame by employing the finite element method and the shear wall by boundary element method. This study is applicable to a specific situation, where the boundary element is surrounded by finite elements. By employing FE dominant method in which boundary stiffness matrix is transformed into finite element stiffness matrix, boundary element and finite element method are combined to analyze frame structure with walls.