Modelling of yield point phenomenon in bake-hardening grade steel

Nachiket S. Deshmane*, Semih E. Perdahcioglu, Ton van den Boogaard

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

In this study the yield point phenomenon in Bake-Hardening grade steel is predicted using a physically based thermo-mechanical model. A modified Taylor equation is proposed with a physically based dislocation density evolution approach. The softening that follows the higher yield point is incorporated with a Voce type decaying exponential function. The strain rate dependency of the plastic hardening is also incorporated in the model. The yield point in the decay function is also strain rate dependent but does not follow the same dependency of plastic hardening. This was solved by making the decay function strain rate dependent by adding a modified strain rate stress term to the exponential function. This parameter is calculated based on tensile experiments. Due to the softening behavior of the material, the numerical model is mesh size sensitive. Hence, a lower order strain gradient enhanced approach is implemented. The gradient is in a form of an additional hardening term assigned in the locally strained bands based on the plastic strain gradient. Hill48 yield criterion is used to assimilate the anisotropy in the steel grade. The numerical results show good correspondence with experimental tensile tests. The regularization significantly reduced the mesh size dependency of the numerical results.

Original languageEnglish
Title of host publicationMaterial Forming - The 26th International ESAFORM Conference on Material Forming – ESAFORM 2023
EditorsLukasz Madej, Mateusz Sitko, Konrad Perzynsk
PublisherAssociation of American Publishers
Pages1511-1520
Number of pages10
ISBN (Print)9781644902462
DOIs
Publication statusPublished - 19 Apr 2023
Event26th International ESAFORM Conference on Material Forming, ESAFORM 2023 - Kraków, Poland
Duration: 19 Apr 202321 Apr 2023
Conference number: 26

Publication series

NameMaterials Research Proceedings
PublisherMaterials Research Forum
Volume28
ISSN (Print)2474-3941
ISSN (Electronic)2474-395X

Conference

Conference26th International ESAFORM Conference on Material Forming, ESAFORM 2023
Abbreviated titleESAFORM 2023
Country/TerritoryPoland
CityKraków
Period19/04/2321/04/23

Keywords

  • Lüders Bands
  • Mesh Size Dependency
  • Strain Gradient
  • Strain Localization
  • Yield Point Phenomenon

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