• Title, Summary, Keyword: LS-DYNA

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Failure Behavior Analysis of R.C Beams using LS-DYNA (LS-DYNA를 이용한 철근 콘크리트 보의 파괴 거동 해석)

  • Park, Gun;Hong, Ki-Nam;Hang, Sang-Hoon;Kwon, Yong-Gil
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.297-300
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    • 2008
  • This study focuses on the evaluation of efficiency of the explicit FEM program LS-DYNA to predict the failure behavior of reinforced concrete. Analysis variables of reinforced concrete beams were longitudinal bar ratio, shear steel ratio and span-depth ratio. Failure behavior of reinforced concrete beams was approximately simulated by LS-DYNA.

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A Knowledge-based Material Selector for LS-DYNA and Hypermesh User (Hypermesh를 사용하는 LS-DYNA 사용자를 위한 재료 물성치 선정 지식형 시스템)

  • Park Hyeon Gyo;Huh Yong Jeong
    • Proceedings of the KAIS Fall Conference
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    • pp.51-54
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    • 2005
  • 본 논문은 LS-DYNA960의 사용자로서 전처리기의 Hypermesh6.0을 사용하는 초급 사용자와 이제 막 공부를 시작한 학생들을 기계의 재료에 대한 물성치의 기본 지식과 사용경험이 부족한 상태에서도 LS-DYNA의 Material card를 적절히 선정할 수 있도록 유도하고 그에 해당하는 Hypermesh의 Material card를 선정해 주는 지식형 시스템의 개발에 관한 것이다.

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A Study on the Collision and Grounding of Ships using HYDROCODE LS/DYNA3D (HYDROCODE LS/DYNA3D를 이용한 선박의 충돌 및 좌초에 관한 연구)

  • 이상갑;정영구
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.3 no.1
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    • pp.1-14
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    • 1997
  • This paper describes a series of numerical simulations of colision between a 310, 000 DWT double hull VLCC (struck ship) and three 35, 000, 70, 000 and 105, 000 DWT tankers (striking ships) using LS/DYNA3D. Collisions are assumed to occur at the middle of the VLCC with the striking ships moving at right angle to the VLCC centerline. Striking ship speeds are varied to find a critical speed without failure of inner side shell, and the informations of collision force and absorption energy of each case are also reported. The validation of LS/DYNA3D in this study was made by comparing the result of numerical simulation of LS/DYNA3D with that of double hull tanker grounding experiment by the Carderock Division of Navla Surface Warfare Center (CDNSWC).

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Integrating the Hoek-Brown Failure Criterion into the Holmquist-Johnson-Cook Concrete Material Model to Reflect the Characteristics of Field Rock Mass in LS-DYNA Blast Modeling (LS-DYNA 발파 모델링에서 현장암반의 특성을 반영하기 위한 Hoek-Brown 파괴기준과 Holmquist-Johnson-Cook 콘크리트 재료모델의 접목)

  • Choi, Byung-Hee;Sunwoo, Choon;Jung, Yong-Bok
    • Explosives and Blasting
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    • v.38 no.3
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    • pp.15-29
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    • 2020
  • In this paper the Hoek-Brown (HB) failure criterion is integrated into the Holmquist-Johnson-Cook (HJC) concrete material model to reflect the inherent characteristics of field rock masses in LS-DYNA blast modeling. This is intended to emphasize the distinctive characteristics of field rock masses that usually have many geological discontinuities. The replacement is made only for the static strength part of the HJC material model by using a statistical curve fitting technique, and its procedure is described in detail. An example is also given to illustrate the use of the obtained HJC material model. Computation is performed for a plane strain model of a single-hole blasting on a field limestone by using the combination of the fluid-structure interaction (FSI) technique and the multi-material arbitrary Lagrangian Eulerian (MMALE) method in LS-DYNA.

Three-dimensional finite element static analysis and safety evaluation of attachable roadside barriers on bridges (탈·부착식 교량 방호울타리의 3차원 유한요소 정적해석 및 안전성 평가)

  • Lee, Sang-Youl
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.4
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    • pp.2414-2418
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    • 2014
  • This study carried out three-dimensional finite element analysis and structural safety evaluation of attachable roadside barriers. The effects of diaphragm distance and the number of bolts on displacements and maximum stresses for various parameters are studied using the LS-DYNA finite element program for this study. In this study, the existing finite element analysis of barriers using the LS-DYNA program is further extended to study static behaviors and structural safety of the barrier with module structures connected by anchor bolt inserted through concrete bridge decks. The numerical results for six parameters are verified by comparing different models with displacements and stress distribution occurred in the barrier and shows good structural performance.

Modeling of Fracture Toughness Test Procedures for Metal and Rock Materials using LS-DYNA (LS-DYNA를 이용한 금속 및 암석 재료의 파괴인성시험 모델링)

  • Choi, Byung-Hee;Ryu, Chang-Ha
    • Explosives and Blasting
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    • v.35 no.1
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    • pp.27-33
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    • 2017
  • In this study, two fracture toughness test procedures are modelled for selected metal and rock on LS-DYNA, which is a commercial finite element code. The tests are conducted by using the 3-point bend test procedure for rectangular bar specimen. Because it takes a relatively long time to conduct the test, the implicit solver based on the Newmark method is adopted for the analyses. The values of stress intensity factor obtained from the analyses are 73 and $0.3MPa.m^{0.5}$ for the metal and rock material, respectively. It can be thought that the resulting small value of the fracture toughness of the rock material model well represents the brittleness of rock material.

A Numerical Study of the High-Velocity Impact Response of a Composite Laminate Using LS-DYNA

  • Ahn, Jeoung-Hee;Nguyen, Khanh-Hung;Park, Yong-Bin;Kweon, Jin-Hwe;Choi, Jin-Ho
    • International Journal of Aeronautical and Space Sciences
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    • v.11 no.3
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    • pp.221-226
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    • 2010
  • The failure of a Kevlar29/Phenolic composite plate under high-velocity impact from an fragment simulation projectile was investigated using the nonlinear explicit finite element code, LS-DYNA. The composite laminate and the impactor were idealized by solid elements, and the interface between the laminas was modeled as a tiebreak type in LS-DYNA. The interaction between the impactor and laminate was simulated using a surface-to-surface eroding contact algorithm. When the stress level meets the given failure criteria, the layer in the element is eroded. Numerical results were verified through existing test results and showed good agreement.

Analysis on the Ballistic and Blast Shock for a Space Frame Structure (내충격 개방형 구조물에 대한 피탄 및 폭압 충격 해석)

  • Joo, Jae-Hyun;Gimm, Hak-In;Koo, Man-Hoi;Park, Jee-Woo
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.5
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    • pp.933-940
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    • 2010
  • A numerical analysis for the space frame structure under ballistic and blast loads was performed using LS-DYNA, a commercial code. The space frame structure was developed to be adapted to the ground vehicle in the future and it was designed to build with Al7039 frames and lightweight multi-layered panels for the purpose of weight reduction and shock mitigation. The analyses have done for side impacts by a cylindrical projectile and Comp. C-4 explosive representing major threats to the vehicle. The deformed shape of the panel section and stresses as well as accelerations of the frames calculated from LS-DYNA were compared to the test results to validate the analysis model. The internal energies for panels and frames from LS-DYNA were also compared to each other to discern their role in absorbing the ballistic and blast impact.