Micromechanical modeling of damage mechanisms in dual-phase steel under different stress states
作者： Ali Cheloee Darabi , Javad Kadkhodapour , Ali Pourkamali Anaraki , Mohammadreza Khoshbin , Amir Alaie
DOI: 10.1016/J.ENGFRACMECH.2020.107520
关键词:
摘要: Abstract In this paper, the fracture behavior and micro-damage evolution in DP600 DP980 steels were studied using experimental numerical methods. First, four specimens with different loading conditions tested to investigate influence of stress state on in-situ tensile tests carried out order evaluate damage two steels. Afterwards, 3D RVEs based random martensite phase distribution generated for both materials a VUMAT subroutine was utilized include Modified Mohr-Coulomb (MMC) model ferrite predict macroscopic strain under complex conditions. Finally, mechanism RVE compared test. It observed that initiation DP is dependent size phases. large phases, localization middle caused initiation, whereas smaller grains, such as DP980, boundary phases dominant mechanism. Furthermore, occurred by formation voids, micro-cracks near propagation coalescence these micro-cracks. Also, response surface methodology can be used calibrate parameters MMC resulting FE accurately stress–strain curve all considered conditions, except shear condition. proposed micromechanical same mechanisms
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