• Title/Summary/Keyword: LS-DYNA-3D

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The Analysis of Zigzagging Phenomenon after Collision between KHST and Oblique Truck (KHST와 각이 있는 트럭간의 충돌 후 틀림현상에 대한 해석)

  • Kim, Seung-Rok;Jung, Hyun-Seung;Park, Jun-Soe;Koo, Jung-Soe;Kwon, Tae-Soo
    • Proceedings of the KSR Conference
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    • 2006.11b
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    • pp.300-304
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    • 2006
  • The purpose of this paper is to simulate the collision between a KHST 3D model and an oblique truck and to investigate zigzagging phenomenon. The used train model is the deformable KHST 3D model, its velocity is 110kph, and the angle of the truck is 30 degree. In order to check lateral forces between wheels and rails, the KEYWORDs that LS_DYNA provides, *RAIL_TRACK and *RAIL_TRAIN are used.

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3-Dimensional Nonlinear Analysis of Low Velocity Impact On Composite Plates (복합재료 평판의 비선형 3차원 저속 충격 해석)

  • 김승조;지국현
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2000.04a
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    • pp.38-42
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    • 2000
  • In this study, the low velocity impact behavior of the composite laminates has been described by using 3 dimensional nonlinear finite elements. To describe the geometric nonlinearity due to large deformation, the dynamic contact problem is formulated using the exterior penalty finite element method on the base of Total Lagrangian formulation. The incremental decomposition is introduced, and the converged solution is attained by Newton-Raphson Method. The Newmark's constant-acceleration time integration algorithm is used. To make verification of the finite element program developed in this study, the solution of the nonlinear static problem with occurrence of large deformation is compared with ABAQUS, and the solution of the static contact problem with indentation is compared with the Hertz solution. And, the solution of low velocity impact problem for isotropic material is verificated by comparison with that of LS-DYNA3D. Finally the contact force of impact response from the nonlinear analysis are compared with those from the linear analysis.

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Design on a new oil well test shock absorber under impact load

  • Wang, Yuanxun;Zhang, Peng;Cui, Zhijian;Chen, Chuanyao
    • Structural Engineering and Mechanics
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    • v.28 no.3
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    • pp.335-352
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    • 2008
  • Continuous operation of test and measurement is a new operating technique in the petroleum exploitation, which combines perforation with test and measurement effectively. In order to measure the original pressure of stratum layer exactly and prevent testing instrument from being impaired or damaged, a suitable shock absorber is urgently necessary to research. Based on the attempt on the FEM analysis and experiment research, a new shock absorber is designed and discussed in this paper. 3D finite element model is established and simulated accurately by LS-DYNA, the effect and the dynamic character of the shock absorber impact by half sinusoidal pulse force under the main lobe frequency are discussed both on theoretics and experiment. It is shown that the new designed shock absorber system has good capability of shock absorption for the impact load.

Multi-stage Analysis of Elliptic Cup Drawing Processes with the Large Aspect Ratio by an Explicit Elasto-Plastic Finite Element Method (외연적 유한요소법을 이용한 세장비가 큰 타원형 컵 성형공정의 다단계 해석)

  • Kim, S.H.;Kim, S.H.;Huh, H.
    • Transactions of Materials Processing
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    • v.9 no.3
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    • pp.313-319
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    • 2000
  • Finite element analysis is carried out for simulation of the multi-stage elliptic cup drawing process with the large aspect ratio. The analysis incorporates with shell elements for an elasto-plastic finite element method with the explicit time integration scheme. For the simulation, LS-DYNA3D is utilized for its wide capability of solving forming problems. The simulation result shows that the non-uniform drawing ratio at the elliptic cross section ad the small shoulder radius cause failure such as tearing and wrinkling. The result suggests the guideline to modify the tool shape for prevention of the failure during the drawing process.

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A Study on Computational Analysis of Ultraprecsion High-speed Machining Process Considering the Strain Rate Effect (초정밀 고속가공 공정에서의 변형율속도를 고려한 전산 시뮬레이션 해석에 관한 연구)

  • Shin, Bo-Sung;Je, Tae-Jin
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.5 no.2
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    • pp.3-9
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    • 2006
  • HSM(High-speed Machining) is widely used in rapid manufacturing of precision products and molds of various materials. Improvement in cutting efficiency is one of the important subjects in the HSM process. To analyse the dynamic behavior during a very short cutting time, the computational analysis code, LS-DYNA3D, was employed for the simulation of the mechanism of HSM for aluminium 7075. This cutting mechanism includes some difficult points in simulation, for example, material and geometrical non-linearity, high-speed dynamic impact, contact with friction, etc. In this paper, a finite element model considering the strain rate effect is proposed to predict the cutting phenomena such as chip deformation, strain and stress distributions, which will help us to design the HSM process.

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A study on design of non-pneumatic small industrial wheel using FEM and vibration tests (비공기압 방식 소형 산업용 바퀴의 설계를 위한 수치해석과 진동실험에 관한 연구)

  • Hong, Pil-Gi;Son, Chang-Woo;Seo, Tae-Il
    • Design & Manufacturing
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    • v.12 no.3
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    • pp.48-54
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    • 2018
  • This paper presents a numerical study for the development of a low-noise low-vibration industrial wheel for non-pneumatic wheel to significantly reduce vibration and noise. For this, design, injection molding and performance testing were performed. Various geometric shapes and materials were taken into account. For numerical analysis, ANSYS, LS-Dyna, and ABAQUS were used to predict the behavior of the wheel under different loadings based on various design changes. Based on this, 4 prototypes were fabricated by changing the design of wheels and molds, and various vibration and noise tests were carried out. A vibration tester was developed and tested to perform the vibration noise test considering durability. A prototype and test of the final wheel was performed. In the case of the vibration test, the vibration levels were 81.16dB and 80.66dB, which were below the target 90dB. Noise levels were 53.20 dB and 52.55 dB below the target 65dB. In the case of the impact resistance test, it was confirmed that there was no change in appearance after impact. The product weight was measured to be 174g compared to the target of 190g.

Axial Impact Collapse Analysis on Hat-shaped Members by FEM (FEM에 의한 단일모자형 단면부재의 축방향 충격압궤 해석)

  • Cha, Cheon-Seok;Gang, Jong-Yeop;Yang, In-Yeong
    • Journal of the Korean Society for Precision Engineering
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    • v.17 no.12
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    • pp.129-136
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    • 2000
  • In the frontal collision the spot welded hat-shaped section side member is the fundamental structure for automobiles and has a great amount of absorbing capacity. For this reason LS-DYNA3D has been used for analyzing impact collapse characteristics on hat shaped section member with respect to the valuables; thickness, width ratio and spot weld potch on impact load(7.19m/sec, 1034J). By comparing the results from simulation and the experimental results, the utilization of simulation has been certified.

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Blank Design in Multi-Stage Rectangular Deep Drawing of Extreme Aspect Ratio (세장비가 큰 다단계 초정밀 사각형 디프드로잉을 위한 블랭크 설계)

  • 박철성;구태완;강범수
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.258-261
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    • 2003
  • In this study, finite element analysis for multi-stage deep drawing process of rectangular configuration with extreme aspect ratio is carried out especially for the blank design. The analysis of rectangular deep drawing process with extreme aspect ratio is likewise very difficult with respect to the design process parameters including the intermediate die profile. In order to solve the difficulties, numerical approach using finite element method is performed in the present analysis and design. A series of experiments for multi-stage rectangular deep drawing process are conducted and the deformed configuration is investigated by comparing with the results of the finite element analysis. Additionally, to minimize amount of removal material after trimming process, finite element simulation is applied for the blank modification. The analysis incorporates brick elements for a rigid-plastic finite element method with an explicit time integration scheme using LS-DYNA3D.

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Forming Analysis of the Front Side Member with Equivalent Draw-bead and Application to Crash Analysis (등가 드로오비드를 적용한 Front Side Member의 성형 해석 밑 충돌 해석에의 적용)

  • Song, J.H.;Kim, K.P.;Kim, S.H.;Huh, H.;Kim, H.S.;Hong, S.G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.266-269
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    • 2003
  • This paper is concerned with a forming analysis of front side members and the application of the forming effect in crash analysis of auto-body. Drawbead restraining forces are calculated with ABAQUS/Strandard in order to identify the boundary condition in forming process. Forming analysis with equivalent drawbead is carried out with LS-DYNA3D. In order to demonstrate the validity of the forming analysis, quantitative comparison of the thickness variation between the real product and the numerical simulation result is carried out. Forming histories obtained from the forming analysis are utilized as the initial condition of the crash analysis for accurate assessment of the crashworthiness.

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Numerical Analysis of Forming for KEP engine Sheet matal part (KFP 엔진 박팍 부품 드로잉 성형해석)

  • 오성국;정완진;안홍;이영호
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1994.06a
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    • pp.163-172
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    • 1994
  • The Aerospace and automobile industries have need to avoid sheet-metal forming problem such as incorrect springback after forming and trimming process, excessive thinning/tearing, wrinking/perkering. It is common practice to use costly trial-and-error experimental methods to develop tooling and manufacturing process parameters. Experimentation should be complemented with computer simulation to reduce cost and leadtime in manufacturing and to influence the design of components. In this study, firstly we solved the springback problem after drawing and trimming process of KFP(F100-229) engine airsealing bearing support part(53H00) forming and studied on the effect of several process parameters on the gap between the formed blank and punch shape using the implicit F.E.M code(ABAQUS). Secondly by the three dimensional dynamic analysis using the explicit. F. E. M code (LS-DYNA3D), we studied on the effect of several process parameters which can be used for avoid tearing and wrinking during the drawing process.