Two easily-overlooked issues in numerical simulation of material’s failure

ZHAO Yue-tang; LI Zhen-hui; CHU Cheng

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Two easily-overlooked issues in numerical simulation of material’s failure

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- Two easily-overlooked issues in numerical simulation of material’s failure
- Vol. 34, Issue S1, (2013)
- 作者机构：
  
  解放军理工大学国防工程学院,南京,210007
- 作者简介：
- 基金信息：
- DOI：
  CLC： TU452
- Online First：09 June 2014，
  
  Published：2013
- 稿件说明：
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ZHAO Yue-tang, LI Zhen-hui, CHU Cheng. Two easily-overlooked issues in numerical simulation of material’s failure[J]. 2013, 34(S1).
DOI：

ZHAO Yue-tang, LI Zhen-hui, CHU Cheng. Two easily-overlooked issues in numerical simulation of material’s failure[J]. 2013, 34(S1). DOI：

摘要

材料的破坏模拟方法对计算结果的正确性有着非常大的影响。基于对破坏判据的分析认识，指出在破坏问题数值模拟过程中容易忽视的两个问题，包括计算过程中单元的侵蚀问题和单元侵蚀后的内部接触问题。以圆柱状试块受压破坏问题和岩石坑道震塌破坏试验问题为背景，考察这两个问题对材料破坏问题的影响。理论分析和算例分析表明，通过定义节点约束失效和内部单元接触条件，可以比较合理地模拟诸如岩石坑道的震塌破坏等材料和介质的破坏问题，常用的侵蚀算法对材料破坏问题的模拟存在很大的局限性。

Abstract

The simulation technique of materials’ failure has a great influence on the validity of the results. Based on the knowledge of materials’ failure criterion

two easily-overlooked issues in numerical simulation are put forward

which include elements’ erosion and inner contact after erosion during the numerical computation. With the background of cylindrical specimen’s failure test under compression loads and rock tunnel’s collapse test

the influence of the two issues on materials’ fracture are evaluated. Theoretical analysis and numerical computation indicate that

by defining constrained node set with failure and inner contact condition

the failure problem of materials and media can be properly simulated

such as the rock tunnel’s collapse

etc

the erosion algorithm for severe distorted elements has obvious imperfection.

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