Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation
Abstract
:1. Introduction
2. Experimental
2.1. Material
2.2. Mechanical Testing
3. Micromechanical Modelling
3.1. RVE Generation
3.2. Single Phase Flow Curve Modelling
3.3. Correlation among Monotonic Flow Curve and Cyclic Behavior of Single Phases
3.4. Kinematic Hardening Parameters for Single Phases
4. Results and Discussion
5. Conclusions
- A micromechanical modelling approach using a 2D representative volume element was successfully employed to estimate the stable hysteresis stress-strain loop of multiphase steel.
- The cyclic behavior of individual phases was predicted using the dislocation density hardening model associated with the basic idea of Lopez and Fatemi [47]. about the correlation between the tensile properties and cyclic deformation.
- The simulation shows the acceptable cyclic hardening/softening behavior for single phases. Also, the difference in the cyclic behavior of single phases resulted in an inhomogeneous strain accumulation in soft ferrite.
- The comparison between experimental and simulated hysteresis stress-strain loop showed good agreement. Therefore, this approach can be considered as a method to predict the stabilised stress-strain hysteresis loop of dual phase steel.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Chemical Composition (wt %) | |||||||
---|---|---|---|---|---|---|---|
C | Mn | Si | P | S | Al | Cr | Mo |
0.099 | 1.23 | 0.079 | 0.012 | 0.001 | 0.894 | 0.04 | 0.195 |
Sy (MPa) | Su (MPa) | El (%) |
---|---|---|
402 | 616 | 23.1 |
α | Taylor Factor M | Shear Modulus µ (MPa) | Burgers Vector b (m) | Dislocation Mean Free Path L (m) | Recovery Rate kr | ||
---|---|---|---|---|---|---|---|
Ferrite | Martensite | Ferrite | Martensite | ||||
0.33 | 3 | 80,000 | 2.5 × 10−10 | dα | 3.8 × 10−8 | 10−5/dα | 41 |
Phase | σ0 (MPa) | C1 (MPa) | C2 (MPa) | C3 (MPa) | γ1 | γ2 | γ3 |
---|---|---|---|---|---|---|---|
Ferrite | 119 | 113,358 | 19,591 | 3450.5 | 1177 | 111.81 | 7.0668 |
Martensite | 563.16 | 10,333 | 49,958 | 2.5 × 105 | 8.2915 | 99.816 | 768.79 |
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Moeini, G.; Ramazani, A.; Myslicki, S.; Sundararaghavan, V.; Könke, C. Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation. Metals 2017, 7, 265. https://doi.org/10.3390/met7070265
Moeini G, Ramazani A, Myslicki S, Sundararaghavan V, Könke C. Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation. Metals. 2017; 7(7):265. https://doi.org/10.3390/met7070265
Chicago/Turabian StyleMoeini, Ghazal, Ali Ramazani, Sebastian Myslicki, Veera Sundararaghavan, and Carsten Könke. 2017. "Low Cycle Fatigue Behaviour of DP Steels: Micromechanical Modelling vs. Validation" Metals 7, no. 7: 265. https://doi.org/10.3390/met7070265