适用于弹黏塑性本构模型的修正切面算法

Translated title of the contribution: Modified cutting-plane integration scheme for elasto-viscoplastic models

Jian Li, Guo Qing Cai, Zhen Yu Yin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The elasto-viscoplastic model can be regarded as a combination of the modified Cam-clay model and the overstress theory. Firstly, the stress-strain formulas for the model are rearranged, in which an evolution equation for the hardening parameter of dynamic loading surface is deduced based on the overstress theory. Secondly, the rearranged stress-strain formulas are numerically implemented by the cutting-plane integration scheme. In an elastic prediction process, the viscoplastic strain rate is assumed to be constant, which guarantees the deviation of the current stress state from dynamic loading surface due to time increments. In a plastic corrector process, a Taylor series approximation of the dynamic loading function is used to obtain the increment of viscoplastic multiplier rate. Thirdly, an adaptive substepping method is proposed to maintain the accuracy and convergence of the proposed algorithm at a large loading step. Finally, the performances of the modified cutting-plane algorithm are analyzed by the calculated results of step-changed oedometer tests and undrained triaxial tests.

Translated title of the contributionModified cutting-plane integration scheme for elasto-viscoplastic models
Original languageChinese
Pages (from-to)253-259
Number of pages7
JournalYantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering
Volume42
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • Constitutive model
  • Cutting-plane algorithm
  • Numerical integration
  • Semi-implicit scheme
  • Viscoplasticity

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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