Adaptive contact elements for three-dimensional explicit transient analysis

Kulak, R F

doi:10.2172/6417420

Cited by 3 publications

(7 citation statements)

References 1 publication

(1 reference statement)

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“…For the GDH impact on adjacent GDH, and GDH impact on adjacent wall, the node-to-line contact element [7,8] was used in this analysis. The node-to-line contact element, a triangular element, in which one node of a broken pipe element is connected to two nodes of a neighboring pipe or wall.…”

Section: Modeling Of Reinforced Concrete Walls and Pipes By Finite Elmentioning

confidence: 99%

Evaluation of pipe whip impacts on neighboring piping and walls of the Ignalina Nuclear Power Plant

Dundulis

Ušpuras

Kulak³

et al. 2007

Nuclear Engineering and Design

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Presented in this paper is the transient analysis of a Group Distribution Header (GDH) following a guillotine break at the end of the header. The GDH is the most important component of reactor safety in case of accidents. Emergency Core Cooling System (ECCS) piping is connected to the GDH piping such that, during an accident, coolant passes from the GDH into the ECCS.The GDH that is propelled into motion after a guillotine break can impact neighboring GDH pipes or the nearest wall of the compartment. Therefore, two cases are investigated:GDH impact on an adjacent GDH and its attached piping; GDH impact on an adjacent reinforced concrete wall. A whipping RBMK-1500 GDH along with neighboring concrete walls and pipelines is modeled using finite elements. The finite element code NEPTUNE used in this study enables a dynamic pipe whip structural analysis that accommodates large displacements and nonlinear material characteristics. The results of the study indicate that a whipping GDH pipe would not significantly damage adjacent walls or piping and would not result in a propagation of pipe failures.

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Section: Modeling Of Reinforced Concrete Walls and Pipes By Finite Elmentioning

confidence: 99%

Evaluation of pipe whip impacts on neighboring piping and walls of the Ignalina Nuclear Power Plant

Dundulis

Ušpuras

Kulak³

et al. 2007

Nuclear Engineering and Design

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“…“Optimum” refers to the “interface parameters” employed that result in acceptable interface compatibility and maintains numerical contact stability. 26…”

Section: Introductionmentioning

confidence: 99%

“…Although those general guidelines are relatively helpful for identifying good interface parameters, it is widely recognized 14,15,25,26,30 that there are no universally applicable rules/guidelines for particular problems considered. Regarding the specific problem of W/R rolling contact, more research attention to the importance of interface parameters has to be drawn.…”

Section: Introductionmentioning

confidence: 99%

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Effect of wheel–rail interface parameters on contact stability in explicit finite element analysis

Markine

Mashal

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part F:

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It is widely recognized that the accuracy of explicit finite element simulations is sensitive to the choice of interface parameters (i.e. contact stiffness/damping, mesh generation, etc.) and time step sizes. Yet, the effect of these interface parameters on the explicit finite element based solutions of wheel-rail interaction has not been discussed sufficiently in literature. In this paper, the relation between interface parameters and the accuracy of contact solutions is studied. It shows that the wrong choice of these parameters, such as too high/low contact stiffness, coarse mesh, or wrong combination of them, can negatively affect the solution of wheel-rail interactions which manifest in the amplification of contact forces and/or inaccurate contact responses (here called ''contact instability''). The phenomena of ''contact (in)stabilities'' are studied using an explicit finite element model of a wheel rolling over a rail. The accuracy of contact solutions is assessed by analyzing the area of contact patches and the distribution of normal pressure. Also, the guidelines for selections of optimum interface parameters, which guarantee the contact stability and therefore provide an accurate solution, are proposed. The effectiveness of the selected interface parameters is demonstrated through a series of simulations. The results of these simulations are presented and discussed.

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“…A numerical approach, e.g. the finite element method, is thus a necessary alternative [2][3][4][5][6][7][8][9][10][11][12][13][14][15]. The versatility of the finite element method makes it possible to solve contact problems involving bodies with complicated geometrical shapes and general material properties.…”

Section: Introductionmentioning

confidence: 99%

On elasto‐plastic finite element analysis of some frictional contact problems with large sliding

Ling

Stolarski

1997

Engineering Computations

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Adaptive contact elements for three-dimensional explicit transient analysis

Cited by 3 publications

References 1 publication

Evaluation of pipe whip impacts on neighboring piping and walls of the Ignalina Nuclear Power Plant

Evaluation of pipe whip impacts on neighboring piping and walls of the Ignalina Nuclear Power Plant

Effect of wheel–rail interface parameters on contact stability in explicit finite element analysis

On elasto‐plastic finite element analysis of some frictional contact problems with large sliding

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