AN IMPROVEMENT OF LOADING CRITERION FOR STRESS CALCULATION BASED ON RETURN-MAPPING SCHEME FOR EXTENDED SUBLOADING SURFACE PLASTICITY MODEL
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- IGUCHI Takuya
- 東北大学 大学院工学研究科土木工学専攻
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- FUKUDA Tatsuya
- 東北大学 大学院工学研究科土木工学専攻
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- YAMAKAWA Yuki
- 東北大学 大学院工学研究科土木工学専攻
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- IKEDA Kiyohiro
- 東北大学 大学院工学研究科土木工学専攻
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- HASHIGUCHI Koichi
- MSC Software, Ltd.
Bibliographic Information
- Other Title
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- 弾性予測子/リターンマッピングによる拡張下負荷面モデルの応力計算における負荷判定法の改良
Abstract
This paper presents an improved loading criterion in the elastic predictor/plastic corrector (return-mapping) algorithm for the extended subloading surface model for cyclic plasticity. Stress increments pointing inward of the subloading surface do not always lead to purely elastic unloading. More specifically, when a large stress increment in such direction is imposed, the subloading surface model can exhibit elastic unloading, followed by plastic reverse loading. During this transitional process, the subloading surface shrinks and degenerates to a stress point, and then expands toward the normal-yield surface. However, the standard loading criterion merely based on the elastic trial state may give an incorrect loading/unloading judgment, leading to serious error in numerical stress calculation. We thus develop a novel algorithm for the subloading surface model equipped with an improved loading criterion, together with a sub-step scheme, which can properly judge and track a process involving elastic unloading and plastic loading within an incremental step even in the above-mentioned cases. Numerical examples demonstrate that the proposed algorithm enables highly accurate stress calculation even in cyclic loadings with arbitrarily large strain increments.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM))
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Journal of Japan Society of Civil Engineers, Ser. A2 (Applied Mechanics (AM)) 73 (2), I_363-I_375, 2017
Japan Society of Civil Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390282680326301952
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- NII Article ID
- 130006329816
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- ISSN
- 21854661
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed