• Title/Summary/Keyword: hyperelastic

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Finite element analysis of welding processes (용접공정의 유한요소해석)

  • Choi, Kang-Hyouk;Kim, Ju-Wan;Im, Se-Young
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.465-467
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    • 2004
  • Finite element analysis of welding processes, which entail phase evolution, heat transfer and deformation, is considered in this paper. Attention focuses on numerical implementation of the thermo-elastic-plastic constitutive equation proposed by Leblond et al in consideration of the transformation plasticity. Based upon the multiplicative decomposition of deformation gradient, hyperelastic formulation is employed for efficient numerical integration, and the algorithmic consistent moduli for elastic-plastic deformations including transformation plasticity are obtained in the closed form. The convergence behavior of the present implementation is demonstrated via a couple of numerical examples. Several locking phenomena removed by Solid-shell element.

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A Study on the Stiffness of Tire (타이어의 강성계수에 관한 고찰)

  • 이상선;반재삼;김항우;조규종
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.886-889
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    • 2002
  • Finite Element Method for 3-D static loaded passenger car tire on the rigid surface is performed for studying the stiffness of tire to compare with experimental data. The tire elements used for FEM are defined each component to allow an easy change for the design parameters. Also, a hyperelastic material which is composed of tread and sidewall has been used to consider a large deformation of rubber components. The orthotropic characters of rubber-cord composite materials are used as well. The air pressure, a vertical and a lateral load are applied step by step and iterated by Modified Newton method for geometric and boundary condition nonlinear simulation. This study shows nonlinear analysis method for tire and the bearing capacity of tire due to the external force.

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ABAQUS를 이용한 O-링 밀봉 부의 설계민감도 분석기법 연구

  • 이방업;구송회;조원만;오광한
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 1996.11a
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    • pp.3-11
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    • 1996
  • 본 연구는 고체 추진기관의 각종 밀봉 부에 많이 사용되는 O-링의 설계시 고려되는 각종 형상인자의 변화에 따른 O-링의 거동과 응력 상태를 분석하여 설계 최적조건을 찾기 위한 내용을 다루고 있다. 조립 부의 내외경과 조립 공차, 챔퍼길이와 각도, 조립 홈의 외경, 깊이, 폭, 구성반경, O-링의 내경과 선 직경 등의 설계 변수에 의한 조립부 형상과 재료의 물성치, 유한요소 선택 및 요소 분할, 경계조건, 하중조건, 접촉부 정의 등을 MSC/PATRAN3의 $PCL^{[1]}$/로 프로그래밍 하여 설계변수에 의한 결과 분석을 손쉽게 수행할 수 있도록 시도하였다 고무의 Hyperelastic 물성치는 문헌상의 자료$자료^{[2]}$에 제시된 Ogden 상수를 사용하였으며 추후에는 인장시험, 순수전단시험, 이 축 인장시험을 통해 실험적으로 측정$^{[3]}$ 하여 적용할 예정이다. 고무의 대변형, 대 변형률을 고려한 비선형 응력해석은 MSC/PATRAN3의 Advanced FEA 모듈과 ABAQUS 5.5를 사용하였다. 본 연구에서의 해석결과를 설계변수들의 영향을 비교 분석하는데 사용하였으나 그 정확도가 입증된 상태는 아니며 추후 실제 조립 및 수압시험을 통해 평가할 예정이다.

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A general convergence condition of the Newton-Raphson algorithm applied to compressible hyperelasticity

  • Peyraut, Francois;Feng, Zhi-Qiang;Labed, Nadia
    • Structural Engineering and Mechanics
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    • v.21 no.2
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    • pp.121-136
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    • 2005
  • This paper presents the implementation of the Blatz-Ko hyperelastic compressible model in a finite element program to deal with large deformation problems. We show analytically and numerically that the minimum number of increment steps in the Newton-Raphson algorithm depends on material properties and applied loads. We also show that this dependence is related to the orientation preservation principle. So we propose a convergence criteria based on the sign of eigenvalues of the deformation gradient matrix.

A Study on Tensile Properties and Non-linear Behavior Analysis of Membrane for Stratospheric Airship Envelop (성층권 비행선용 막 재료의 인장 물성 측정 및 비선형 거동에 관한 연구)

  • Lee, Han-Geol;Roh, Jin-Ho;Lee, In;Kang, Wang-Gu;Yeom, Chan-Hong
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2005.11a
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    • pp.103-106
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    • 2005
  • The material properties of membrane for stratospheric airship is experimentally investigated. Mechanical tensile properties of the membrane material at room, high and low temperature are measured using instron with thermal chamber. Experimentaly, material non-linearity is observed at room and high temperature. In order to simulate material non-linearity caused by the uniaxial extension curve of a woven fabric, the nonlinear hyperelastic problem is considered with finite clement program of ABAQS. Numerical results are compared with experimental results.

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Hyperelastic Finite Element Formulation using Pressure Potential (압력포텐샬을 이용한 초탄성 유한요소 정식화)

  • Kim, Heon-Young;Kim, Ho;Kim, Joong-Jae
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.12
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    • pp.2492-2502
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    • 2002
  • A rubber-like material model is generally characterized by hyperelasticity and formulated by a total stress-total strain relationship because the material shows nonlinear elastic behaviour under large deformation. In this study, a pressure potential obtained by a separately interpolated pressure is introduced to the non-linear finite element formulation incorporating with incompressible or almost incompressible condition of the material. The present formulation is somewhat different from the general formulation using the pressure computed in the displacement field. A non-linear finite element analysis program is developed for the plane strain and the axisymmetric contact problems of a rubber-like material. Various examples with rubber material are analyzed for its verification. The results about deformed shapes and stress distributions thought to be meaningful in comparison with a commercial program, MARC.

A Finite Element Analysis for Near-net-shape Forming of Al6061 Powder under Warm Pressing (온간 성형 하에서 Al 합금 분말의 정밀정형에 대한 유한요소해석)

  • Kim, Ki-Tae;Yang, Hoon-Chul;Kim, Jong-Kwang
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.507-512
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    • 2003
  • A finite element analysis for near-net-shape forming of Al6061 powder was performed under warm pressing. The advantages of warm compaction by rubber isostatic pressing were discussed to obtain parts with better density distributions. To simulate densification and deformed shape of a powder compact during warm pressing, the elastoplastic constitutive equation based on yield function of Shima-Oyane was implemented into a finite element program(ABAQUS). The hyperelastic constitutive equation based on the Ogden strain energy potential was employed to analyze nonlinear elastic response of rubber. Finite element results were compared with experimental data for Al6061 powder compacts under warm pressing.

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A Study on the Equi-biaxial Tension Test of Rubber Material (고무재료의 이축 인장시험에 관한 연구)

  • Kim, Dong-Jin;Kim, Wan-Doo;Kim, Wan-Soo;Lee, Young-Shin
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.425-430
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    • 2003
  • The material properties of rubber was determined by the experiments of uniaxial tension, uniaxial compression, planer tension, equi-biaxial tension and volumetric compression. In compression test, it is difficult to obtain the pure state of compression stress and strain due to friction force between the specimen and compression platen. In this study, the stress and strain data from the equi-biaxial tension test were converted to compression stress and strain and compared to a perfect state of simple compression data when friction was zero. The compression test device with the tapered platen was proposed to overcome the effect of friction. It was turned out that the relationship of the stress and strain using the tapered platen was in close agreement with the pure compressive state.

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Numerical implementation of a constitutive equation of transformation plasticity in welding (용접공정에서 발생하는 변태 소성 구성방정식의 수치적 구현에 관한 연구)

  • Kim, Ju-Wan;Im, Se-Young;Kim, Hyun-Gyu;Choi, Kang-Hyouk
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1154-1158
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    • 2003
  • Finite element analysis of welding processes, which entail phase evolution, heat transfer and deformations, is considered in this paper. Attention focuses on numerical implementation of the thermo-elastic-plastic constitutive equation proposed by Leblond in consideration of the transformation plasticity. Based upon the multiplicative decomposition of deformation gradient, hyperelastic formulation is employed for efficient numerical integration, and the algorithmic consistent moduli for elastic-plastic deformations including transformation plasticity are obtained in the closed form. The convergence behavior of the present implementation is demonstrated via a couple of numerical examples.

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The Behavior and Characterization Analysis of Elastomer Seal for High Speed Pneumatic Cylinder (고속 공기압 실린더의 거동 및 특성 해석 기술 연구)

  • Hur, Shin;Woo, Chang-Su;Kim, Dong-Soo;Kim, Young-Seok
    • Proceedings of the KSME Conference
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    • 2008.11a
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    • pp.1215-1220
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    • 2008
  • The aim of this paper is to perform a finite element analysis that will have the ability to predict the seal performance characteristics, such as deformation, contact load and friction and also is to provide a means of potential seal designs, which can reduce the time and cost of designing the performance of the seal. The material property tests of elastomer seal are performed to obtain the hyperelastic properties and The Mooney-Rivlin constants are determined from these test results. A 2D modelling of the seal cross section is performed to simulate the contact behavior between the seal on the piston and the cylinder bore under operation conditions. The deformation behavior, contact load and friction of an elastomer seal is analyzed by a finite element method which performs three analytic phases of interference fit, the variations of pneumatic pressure and piston movement under the operational conditions.

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