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RISS 인기검색어
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- 저자 : 양철호(Chulho Yang) (검색결과 43 건)
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FEA 를 이용한 NiAl 단결정 소성 변형의 결정 방향 의존에 관한 연구
양철호(Chulho Yang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Deformation of single crystals was studied using finite element analysis to investigate the orientation dependence of plastic deformation observed in NiAl single crystals. Investigation of mechanical properties of single crystals is closely related with the understanding of deformation processes in single crystals. Orientation dependence of material behavior in NiAl single crystals was studied by rotating loading directions from ‘hard’ orientation. The maximum nominal compressed stress in NiAl single crystals was ranged in a quite wide scope depending on the misalignment from ‘hard’ orientation. As the compressed axis set closer to ‘hard’ orientation, the maximum nominal compressed stress rapidly increased and made <100> slips difficult to activate. Therefore, non-<100> slips will be activated instead of <100> slips for ‘hard’ orientation.
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양철호(Yang Chulho) 한국사회조사연구소 2004 사회연구 Vol.- No.7
이 연구를 통하여 노인학대의 개념을 정리하고 노인학대 측정도구를 개발하였으며 전국민의 노인학대에 대한 의식을 알아보고 노인학대의 실체를 어느 정도 파악할 수 있었다. 단, 조사비용과 시간의 제약으로 인하여 노인학대의 완전한 모습을 보여주지는 못하였다. 이 연구와 그동안 이루어진 노인학대 관련 연구들의 결과를 종합하여 우리 사회의 노인학대 문제해결을 위하여 노인학대 예방, 피학대노인과 부양가족을 위한 지지망 강화 그리고 노인학대 방지 및 개입을 위한 법적 제도적 장치 마련 등의 7가지 단기과제와 6가지 중장기 과제를 제시하였다. The outcomes of this research were sound definition and measuring instrument of elder abuse, and clear picture of attitude toward elder abuse and sketch of the actual state of elder abuse. However, we could not draw the clear picture of the actual state of elder abuse due to financial and time limits. Based on the results of the research and other studies, we suggested 7 short-term and 6 mid and long-term plans including prevention of elder abuse, support system for the abused elderly and caregiver, and legal and systematic methods of prevention and intervention.
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양철호(Chulho Yang) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.1
A core material of automotive engine is now replaced by non-ferrous material to reduce weight. Therefore, durability issues could emerge to obtain a robustly designed engine structure. Engine assembly analysis is quite a complicated task due to the enormous size of the FE model and the involvement of inherent nonlinear behavior. The assembly consists of an engine block, a cylinder head, a head gasket and head bolts. An assembled engine model allows the appropriate boundary conditions on each other. A systematic methodology enables effective analysis of the head/block/gasket system for the complete range of engine assembly and engine operating load conditions. Nonlinear gasket behavior, temperature-dependent material properties, elastic-plastic material behavior, contact with friction, head bolt assembly torque, thermal loads and peak cylinder pressure were considered to represent the accurate behavior of engine assembly. The efficient tools of commercial finite element code ABAQUS including the gasket element and Pre_tension section contribute greatly to this complex and CPU intensive analysis.
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양철호(Chulho Yang) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
A systematic method has been proposed to obtain a robust and reliable design of water pump system. A steady-state dynamic model has been developed to study the response of water pump system for the dynamic load due to the run-out and unbalance. Finite element analyses were performed to find parameters that dictate system response. Fan mass was a dominant factor that affects system response among the 6 design parameters considered. By examining influence of design parameters to the system response in a systematic way, more robust and reliable design is expected.
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양철호(Chulho Yang),이태현(Tae-Hyun Lee) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.11
스텐트는 인체의 좁아지거나 막힌 부위에 삽입되어 혈류의 흐름을 정상화 시키는데 사용되는 금속망 형태의 임플란트로 관상 동맥 질환을 치료하는데 가장 일반적인 방법으로 널리 사용된다. 본 논문에서는 유한요소 해석과 다꾸지 방법을 이용하여 설정한 스텐트 설계 인자의 변화에 따른 기계적 반응을 고찰하였다. 스텐트 모델은 팔마즈 스텐트를 사용하였고 스텐트의 재료 모델로서는 탄소성 모델, 풍선은 초탄성 모델을 사용하였다. 연구의 주요 관심은 스텐트의 탄성 회복량 조절을 통한 혈관의 재 협착 문제를 감소시킬 수 있는 방안에 대한 설계 인자의 영향을 고찰하는데 있다. 스텐트 두께, 슬롯의 가로 길이, 슬롯의 세로 길이의 각도를 설계인자로 선택하여 직교배열표를 구성하였다. 유한요소 해석을 이용하여 혈관 내 스텐트의 반경 방향 탄성회복율과 길이 방향 탄성회복율을 계산하였고 다구찌 기법을 이용한 통계적 분석을 하여 재 협착의 가능성을 감소시킬 수 있는 스텐트의 최적 형상 설계 방향을 제시하였다. 최적형상은 기본 모델에 비하여 탄성회복율은 반경방향으로 약 1%, 길이방향으로 약 0.1% 감소함을 보였다. Stents are widely used as the most common method of treating coronary artery disease with implants in the form of a metal mesh. The blood flow is normalized by inserting a stent into the narrowed or clogged areas of the human body. In this study, the mechanical characteristics of a stent are investigated according to the variations of its design parameters by the Taguchi method and finite element analysis. A stent model of the Palmaz-Schatz type was used for the analysis. In the analysis, an elasto-plastic material model was adopted for the stent and a hyper-elastic model was used for the balloon. The main interest of this study is to investigate the effects of the design parameters which reduce the possibility of restenosis by adjusting the recoil amount. A Taguchi orthogonal array was constructed on the model of the stent. The thickness and length and angle of the slot were selected as the design parameters. The amounts of radial recoil and longitudinal recoil were calculated by finite element analysis. The statistical analysis using the Taguchi method showed that optimizing the shape of the stent could reduce the possibility of restenosis. The optimized shape showed improvements of recoil in the radial and longitudinal directions of ~1% and ~0.1%, respectively, compared to the default model.
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양철호(Chulho Yang) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.1
In this study, finite element analyses were planned to understand the sensitivity regarding the stress behavior of the thread regions of the bulkhead. A detailed sub-model representing the thread region of the bulkhead was generated automatically in CATIA. Variations of main bearing load direction and main bolt preload are selected as the sensitivity analysis variables(SAV). The variations of main bolt preload showed higher sensitivity than the main bearing load direction in the thread region of the bulkhead. In addition, the stress sensitivity in the thread region is increased when a low preload was applied to the main bolt. High sensitivity occurs with low preload because during the loading steps, the prevailing plastic deformations in hot-assembly and fire load after the dominant elastic deformation in cold-assembly amplify the stress difference among the loading steps. Therefore, main bolt preload should be applied high enough to reach the state of plastic deformation even in the cold-assembly step in order to reduce sensitivity.
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