FEM modeling of the flow curves and failure modes of dual phase steels with different martensite volume fractions using actual microstructure as the representative volume

2012 ◽  
Vol 65 ◽  
pp. 197-202 ◽  
Author(s):  
M. Marvi-Mashhadi ◽  
M. Mazinani ◽  
A. Rezaee-Bazzaz
Keyword(s):  
Failure Modes ◽  
Dual Phase ◽  
Fem Modeling ◽  
Flow Curves ◽  
Dual Phase Steels ◽  
Volume Fractions ◽  
Representative Volume

Failure Modes of Dual Phase Steels under Different Loading Paths

2010 ◽  
Vol 160-162 ◽  
pp. 1674-1679
Author(s):  
Nan Qiao Xu ◽  
Mei Li ◽  
Yi Xi Zhao ◽  
Xing Hu
Keyword(s):  
Failure Modes ◽  
Shear Fracture ◽  
Numerical Models ◽  
Small Radius ◽  
Uniaxial Tensile ◽  
Traditional Theory ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Loading Paths ◽  
Stretch Flanging

In this paper, experimental and numerical analysis is used to investigate the failure modes of dual phase steels under different loading paths. Numerical models are established for uniaxial tensile tests and stretch flanging tests. Special attention has been paid to the behavior of DP780 in stretch flanging tests with small die radius. The occurrence of shear fracture is identified by comparing numerical simulation results with test data. The study suggests that traditional theory of localized necking is feasible for DP780 under uniaxial tensile condition but invalid when it is undergoing stretch flanging tests with small radius.

3D micromechanical modeling of dual phase steels using the representative volume element method

2016 ◽  
Vol 101 ◽  
pp. 27-39 ◽  
Author(s):  
Maedeh Amirmaleki ◽  
Javad Samei ◽  
Daniel E. Green ◽  
Isadora van Riemsdijk ◽  
Lorna Stewart
Keyword(s):  
Representative Volume Element ◽  
Volume Element ◽  
Micromechanical Modeling ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Representative Volume ◽  
Element Method

Micromechanical Modeling of Dual-Phase DP600 Steel Sheet Plastic Behavior Based on a Representative Volume Element Defined from the Real Microstructure

2018 ◽  
Vol 930 ◽  
pp. 293-298 ◽  
Author(s):  
Gustavo Coqui Barbosa ◽  
Luciano Pessanha Moreira ◽  
Lílian Barros da Silveira ◽  
Fabiane Roberta Freitas da Silva ◽  
Marcelo Costa Cardoso
Keyword(s):  
Finite Element ◽  
Chemical Composition ◽  
Plane Strain ◽  
Representative Volume Element ◽  
Steel Sheet ◽  
Volume Element ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
The Real ◽  
Representative Volume

Dual-phase steels offer very attractive combinations of strength and ductility owing to the coexistence of different microstructures components and their interactions. These steels are suitable to the automotive industry due to their improved impact resistance increasing the passenger safety along with the vehicle weight reduction. The properties of the dual-phase steels are attributed to the chemical composition, type, size, amount and spatial distribution of different phases that can be obtained during thermomechanical treatments, namely, ferrite and martensite. In this work, the microstructure of as-received DP600 cold rolled steel sheet with 1.2 mm nominal thickness was firstly characterized by means of scanning electron microscopy technique. Then, a representative volume element was obtained from the DP600 microstructure and a micromechanical finite element model is proposed considering the steel chemical composition, average ferrite grain size, martensite volume fraction and mechanical properties of both ferrite and martensite phases. The uniaxial tension loading was simulated by assuming either plane-stress and plane-strain conditions. The numerical predictions corresponding to the plane-strain model are in good agreement with the experimental true stress-strain curve determined along the sheet rolling direction. The proposed finite element micromechanical approach based on the real microstructure proved to be an important tool to evaluate both local and overall behaviors of DP600 steel grade.

Investigation of damage initiation in high-strength dual-phase steels using cohesive zone model

2016 ◽  
Vol 27 (3) ◽  
pp. 409-438 ◽  
Author(s):  
T Sirinakorn ◽  
V Uthaisangsuk
Keyword(s):  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
High Strength ◽  
Zone Model ◽  
Dual Phase ◽  
Two Dimensional ◽  
Stress Strain ◽  
Dual Phase Steels ◽  
Damage Initiation ◽  
Representative Volume

Dual-phase steels have been increasingly used for several vehicle structural parts due to their great combination of high strength and good formability. However, for an effective forming process of such steel sheets, their complex failure mechanism on the microscale plays an important role. In this work, damage initiation occurrences in two dual-phase steel grades were examined by a micromechanics-based final element modeling approach. Two-dimensional representative volume element models were applied to take into account amount, morphologies, and distributions of each constituent phase. Uniaxial tensile tests and fractography of the examined steels were carried out in order to characterize crack formation in the microstructure. According to a dislocation-based theory and local alloys partitioning, stress–strain curves were defined for the individual phases and interphases, where geometrically necessary dislocations were present due to austenite–martensite transformation. Cohesive zone model with extended finite element method and two-dimensional damage locus were applied in the representative volume elements for describing crack initiation induced by martensite cracking and ductile fracture of ferrite, respectively. Parameters of the damage models were identified by means of correlation between experimental and final element simulation results. The states of damage initiation of both dual-phase steels were predicted. Local stress, strain, and damage distributions in the dual-phase microstructures were determined and discussed.

Mechanical and Electrochemical Behavior of Dual-Phase Steels Having Varying Ferrite–Martensite Volume Fractions

2019 ◽  
Vol 28 (6) ◽  
pp. 3600-3613 ◽  
Author(s):  
Satendra Kumar ◽  
Avinash Kumar ◽  
Vinaya ◽  
R. Madhusudhan ◽  
Rameshwar Sah ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
Dual Phase ◽  
Dual Phase Steels ◽  
Volume Fractions
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