Constitutive modeling and finite element methods for TRIP steels
| Autor: | Gregory N. Haidemenopoulos, M. Agoras, I. Papatriantafillou, Nikolaos Aravas |
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| Rok vydání: | 2006 |
| Předmět: |
Austenite
Materials science Bainite Mechanical Engineering Constitutive equation Computational Mechanics General Physics and Astronomy Mechanics Homogenization (chemistry) Finite element method Computer Science Applications Forming limit diagram Mechanics of Materials Calculus Tensile testing Necking |
| Zdroj: | Computer Methods in Applied Mechanics and Engineering. 195:5094-5114 |
| ISSN: | 0045-7825 |
| DOI: | 10.1016/j.cma.2005.09.026 |
| Popis: | A constitutive model that describes the mechanical behavior of steels exhibiting “TRansformation Induced Plasticity” (TRIP) during martensitic transformation is presented. Multiphase TRIP steels are considered as composite materials with a ferritic matrix containing bainite and retained austenite, which gradually transforms into martensite. The effective properties and overall behavior of TRIP steels are determined by using homogenization techniques for nonlinear composites. A methodology for the numerical integration of the resulting elastoplastic constitutive equations in the context of the finite element method is developed and the constitutive model is implemented in a general-purpose finite element program. The model is calibrated by using experimental data of uniaxial tension tests in TRIP steels. The problem of necking of a bar in uniaxial tension is studied in detail. The constitutive model is used also for the calculation of “forming limit diagrams” for sheets made of TRIP steels; it is found that the TRIP phenomenon increases the strain at which local necking results from a gradual localization of the strains at an initial thickness imperfection in the sheet. |
| Databáze: | OpenAIRE |
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