Constitutive Modeling of Asymmetric Hardening Behavior of Transformation-Induced Plasticity Steels
| Autor: | Sungwook Jun, Jaebong Jung, Byung-Min Kim, Yong Chan Hur, Hyun-Seok Lee, Ji-Hoon Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
020209 energy Constitutive equation TRIP steel Forming processes 02 engineering and technology Plasticity Stamping 020303 mechanical engineering & transports 0203 mechanical engineering visual_art Automotive Engineering Ultimate tensile strength 0202 electrical engineering electronic engineering information engineering visual_art.visual_art_medium Hardening (metallurgy) Composite material Sheet metal |
| Zdroj: | International Journal of Automotive Technology. 20:19-30 |
| ISSN: | 1976-3832 1229-9138 |
| DOI: | 10.1007/s12239-019-0124-6 |
| Popis: | Transformation-induced plasticity (TRIP) steels are part of advanced high strength steels capable of phase transformation, having good strength and ductility. The transformation rate is known to be dependent on the stress state, which may lead to asymmetric hardening behaviour for TRIP steels with compressive flow stresses larger than tensile ones. Sheet stamping products of TRIP steels show complex springback because of the asymmetry in addition to the large strength, which will complicate the analysis of sheet metal forming processes. In this work, the asymmetric hardening behaviour of a TRIP steel with a tensile strength of 1180 MPa was measured using the sheet tension-compression tester. An asymmetric hardening model was developed by introducing an off-centred bounding surface for the kinematic back-stress evolution, to depict the asymmetric hardening behaviour. The model parameters of the proposed constitutive equations were obtained from the stressstrain curves under tension followed by compression. The stress-strain curves were well captured by the developed constitutive model, whereas the conventional symmetric model fails to describe the asymmetric hardening behaviour of the TRIP steel. For validation, load-displacement curve and springback angles of three-point bending test were compared with the predictions by the proposed model. |
| Databáze: | OpenAIRE |
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