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안동규,남경흠,양동열,정찬균 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.5
The deformation behavior and stress-strain relationships for a lightweight sandwich plate in the elastic regions are mainly dependent on the elastic properties of the core in the sandwich plate. The aim of this paper is to determine experimentally the elastic properties of a core in a thin sandwich plate with a metallic truss core. Threepoints bending experiments were performed to obtain a linear relationship between compliance per span length and the square of the span length for the designed sandwich plate. The specimen was manufactured from the continuous multi-points resistance welding of SUS 3O4H sheets and crimped metallic truss cores. The elastic and shear moduli of the core were estimated by the slopes and the intercepts of the linear relationship, respectively. Through the comparison of the shear moduli and force-deflection considering the core stiffness with those disregarding the core stiffness, it was shown that the core stiffness should be considered to estimate accurately the elastic and shear moduli of a core as well as the force-deflection curves of a thin sandwich plate with a metallic truss core. The contribution ratios of the bending and shear deflections of the thin sandwich plate to the total deflection were investigated. In addition, the influence of the crimping angle on the elastic properties, the forcedeflection curves, and the contribution ratios of both bending and shear deflections to the total deflection was examined.
유한요소해석을 이용한 SPFC 780 판재의 충격 특성 연구
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),한길영(Gil-Young Han),성대용(Dae-Yong Seong),양동열(Dong-Yol Yang),임지호(Jiho Lim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The objective of this paper is to investigate the influence of impact conditions on the impact characteristics of the SPFC 780 sheet for the case of the free boundary conditions. In order to examine impact characteristics of the sheet, three-dimensional finite element analyses have been performed. High speed tensile tests have been carried out to obtain strain-stress relationships including the effects of the strain rate. Through the comparison of the results of FE analyses and that of impact tests, an accurate FE model has been developed. In order to reduce error range of load and displacement, the hyper-elastic model and the damping factor have been employed. From the results of FE analyses, the variation of stress and strain energy in the SPFC 780 sheet has been quantitatively examined.
자동차 범퍼 단면으로 정형 가공된 ISB판재의 충격 에너지 흡수 특성 분석
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),한길영(Gil-Young Han),성대용(Dae-Yong Seong),양동열(Dong-Yol Yang) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
The objective of this paper is to investigate into characteristics of the impact energy absorption of ISB panel with a bumper sections of automotive for the case of the fixed boundary conditions. In order to examine into characteristics of the impact energy absorption, drop impact tests have been performed. Through the results of the impact tests, The absorbed impact energy per weight, the nose penetration and the deformation characteristics of the ISB panel have been quantitatively examined. The experimental results of the ISB panel have been compared to those of SPFC 780 panel. From the results of the experiments, it has been shown that ISB panel with a bumper section of automobile has an excellent crashworthiness in comparison with SPFC 780 at the impact energy of 26.1 J and 65.9 J.
자유 경계 조건에서 전단형 딤플 내부구조체를 가진 ISB판재의 충격 특성 분석
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),성대용(Dae-Yong Seong),한길영(Gil-Young Han),양동열(Dong-Yol Yang) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6월
The objective of this paper is to investigate into characteristics of the impact energy absorption of ISB panels for the case of the free boundary conditions. In order to examine into characteristics of the impact energy absorption, drop impact tests have been performed. Through the results of the impact tests, The absorbed impact energy per weight, the deformation characteristics of the ISB panels have been quantitatively examined. The experimental results of the ISB panels have been compared to that of SPFC 780 sheet. The impact energy of the tests ranges from 37.1J to 109.1J. From the results of the experiments, it has been shown that ISB panels have a high absorbed impact energy per weight about 9% in comparison with SPFC 780 sheet.
망형 직조 금속을 내부구조체로 가진 ISB 판재의 심재 종탄성 및 전단 계수 예측
안동규(Dong-Gyu Ahn),남경흠(Gyung-Heum Nam),정창균(Chang-Gyun Jung),양동열(Dong-Yol Yang) Korean Society for Precision Engineering 2009 한국정밀공학회지 Vol.26 No.11
The elastic properties of core affect mechanical properties and deformation behaviours of the lightweight sandwich panel. The objective of the present paper is to estimate experimentally Young’s and shear moduli of a core in internally structured boned (ISB) panel with woven metal as inner structures using the deflection theory of sandwich beam considered core stiffness. Three points bending experiments were performed to obtain force-deflection curves of the designed ISB panel in each material direction. The elastic and shear moduli of the core in each material direction were estimated from slopes and intercepts of relationships between compliance per the span length and square of the span length, respectively. The results of the estimation showed that the fabric technology of the woven metal affects the variation of the elastic properties in the core. Through the comparison of shear moduli and force-deflection curves of the proposed method and those without considering the core stiffness, it was shown that the core stiffness should be considered to estimate properly the Young’s and shear moduli of ISB panels. Finally, the contribution ratio of bending and shear deflections of ISB panels to the total deflection was quantitatively examined.
자유 경계 조건에서 전단형 딤플 내부구조체를 가진 ISB판재의 충격 특성 분석
안동규(Dong-Gyu Ahn),남경흠(Gyeong-Heum Nam),성대용(Dae-Yong Seong),한길영(Gil-Young Han),양동열(Dong-Yol Yang) 한국기계가공학회 2009 한국기계가공학회 춘추계학술대회 논문집 Vol.2009 No.6
The objective of this paper is to investigate into characteristics of the impact energy absorption of ISB panels for the case of the free boundary conditions. In order to examine into characteristics of the impact energy absorption, drop impact tests have been performed. Through the results of the impact tests, The absorbed impact energy per weight, the deformation characteristics of the ISB panels have been quantitatively examined. The experimental results of the ISB panels have been compared to that of SPFC 780 sheet. The impact energy of the tests ranges from 37.1J to 109.1J. From the results of the experiments, it has been shown that ISB panels have a high absorbed impact energy per weight about 9% in comparison with SPFC 780 sheet.