An integrated ice-shedding model of electric transmission lines with consideration of ice adhesive/cohesive failure. McClure, G., Ji, K., & Rui, X. In volume 2014-January, pages 3731 - 3736, Porto, Portugal, 2014. Computational model;Computational results;Effective plastic strain;Mechanical shock load;Mid-span displacements;Reduced scale models;Satisfactory modeling;Shock load;abstract bibtex This research is an attempt to propose an integrated accreted ice failure model for iced overhead line conductors that will lead to more realistic nonlinear dynamic analysis of the ice-shedding phenomenon of transmission lines, by taking into account the adhesive/cohesive strength of ice deposits. Ice shedding induced by sudden mechanical forces is understood to be a two-stage process. First, the continuous ice deposits along the conductor span are broken into smaller separate ice chunks and fragments (ice fracture failure), and then these fragments detach from the cables and fall off due to insufficient cohesive strength within the ice or adhesive strength at the ice-cable interface (ice detachment failure). Two recent successive studies have developed computational models using ice deposit failure criteria based on the maximum effective plastic strain and the maximum bending stress. These models have yielded reasonably accurate results in predicting cable tensions and mid-span displacements, by comparing their numerical results with experimental data from tests carried out on a 4m reduced-scale model span with varying cable diameters and ice thickness, following sudden mechanical shock loads. However, there is still about 20% disparity in ice fracture rates between the computational results and experimental data, and it is deemed necessary to refine the ice failure model to introduce the effects of adhesive/cohesive forces. Therefore, as the first step towards the development of an integrated two-tier ice shedding criterion, the authors have improved the previous FE models, in terms of mesh size, load types and locations, material models and so on, to provide a better description of the experiment results. Then, the refined FE models of the reduced-scale span tests are used to check the newly proposed ice adhesive/cohesive failure criterion. The idea of this criterion is to simply compare the inertia forces acting on the fractured ice segments, and the ice adhesive strength or cohesive strength. The process is done automatically by a subroutine interacting with the nonlinear dynamic analysis commercial software ADINA. Although there is no satisfactory model to calculate the adhesive and cohesive strengths of glaze ice-especially for atmospheric ice, only several representative pairs of values are selected. Validation is underway to ascertain that the proposed two-tier glaze ice shedding criterion provides a more realistic description of the ice-shedding phenomenon of transmission lines than in the previous studies.
@inproceedings{20164603014356 ,
language = {English},
copyright = {Compilation and indexing terms, Copyright 2023 Elsevier Inc.},
copyright = {Compendex},
title = {An integrated ice-shedding model of electric transmission lines with consideration of ice adhesive/cohesive failure},
journal = {Proceedings of the International Conference on Structural Dynamic , EURODYN},
author = {McClure, Ghyslaine and Ji, Kunpeng and Rui, Xiaoming},
volume = {2014-January},
year = {2014},
pages = {3731 - 3736},
issn = {23119020},
address = {Porto, Portugal},
abstract = {This research is an attempt to propose an integrated accreted ice failure model for iced overhead line conductors that will lead to more realistic nonlinear dynamic analysis of the ice-shedding phenomenon of transmission lines, by taking into account the adhesive/cohesive strength of ice deposits. Ice shedding induced by sudden mechanical forces is understood to be a two-stage process. First, the continuous ice deposits along the conductor span are broken into smaller separate ice chunks and fragments (ice fracture failure), and then these fragments detach from the cables and fall off due to insufficient cohesive strength within the ice or adhesive strength at the ice-cable interface (ice detachment failure). Two recent successive studies have developed computational models using ice deposit failure criteria based on the maximum effective plastic strain and the maximum bending stress. These models have yielded reasonably accurate results in predicting cable tensions and mid-span displacements, by comparing their numerical results with experimental data from tests carried out on a 4m reduced-scale model span with varying cable diameters and ice thickness, following sudden mechanical shock loads. However, there is still about 20% disparity in ice fracture rates between the computational results and experimental data, and it is deemed necessary to refine the ice failure model to introduce the effects of adhesive/cohesive forces. Therefore, as the first step towards the development of an integrated two-tier ice shedding criterion, the authors have improved the previous FE models, in terms of mesh size, load types and locations, material models and so on, to provide a better description of the experiment results. Then, the refined FE models of the reduced-scale span tests are used to check the newly proposed ice adhesive/cohesive failure criterion. The idea of this criterion is to simply compare the inertia forces acting on the fractured ice segments, and the ice adhesive strength or cohesive strength. The process is done automatically by a subroutine interacting with the nonlinear dynamic analysis commercial software ADINA. Although there is no satisfactory model to calculate the adhesive and cohesive strengths of glaze ice-especially for atmospheric ice, only several representative pairs of values are selected. Validation is underway to ascertain that the proposed two-tier glaze ice shedding criterion provides a more realistic description of the ice-shedding phenomenon of transmission lines than in the previous studies.<br/>},
key = {Ice},
keywords = {Cables;Finite element method;Computational methods;Deposits;Glazes;Computation theory;Dynamics;Fracture;},
note = {Computational model;Computational results;Effective plastic strain;Mechanical shock load;Mid-span displacements;Reduced scale models;Satisfactory modeling;Shock load;},
}
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Ice shedding induced by sudden mechanical forces is understood to be a two-stage process. First, the continuous ice deposits along the conductor span are broken into smaller separate ice chunks and fragments (ice fracture failure), and then these fragments detach from the cables and fall off due to insufficient cohesive strength within the ice or adhesive strength at the ice-cable interface (ice detachment failure). Two recent successive studies have developed computational models using ice deposit failure criteria based on the maximum effective plastic strain and the maximum bending stress. These models have yielded reasonably accurate results in predicting cable tensions and mid-span displacements, by comparing their numerical results with experimental data from tests carried out on a 4m reduced-scale model span with varying cable diameters and ice thickness, following sudden mechanical shock loads. However, there is still about 20% disparity in ice fracture rates between the computational results and experimental data, and it is deemed necessary to refine the ice failure model to introduce the effects of adhesive/cohesive forces. Therefore, as the first step towards the development of an integrated two-tier ice shedding criterion, the authors have improved the previous FE models, in terms of mesh size, load types and locations, material models and so on, to provide a better description of the experiment results. Then, the refined FE models of the reduced-scale span tests are used to check the newly proposed ice adhesive/cohesive failure criterion. The idea of this criterion is to simply compare the inertia forces acting on the fractured ice segments, and the ice adhesive strength or cohesive strength. The process is done automatically by a subroutine interacting with the nonlinear dynamic analysis commercial software ADINA. Although there is no satisfactory model to calculate the adhesive and cohesive strengths of glaze ice-especially for atmospheric ice, only several representative pairs of values are selected. 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