A modified damage model for advanced high strength steel sheets

Chung, Kwansoo; Ma, Ning; Park, Taejoon; Kim, Dongun; Yoo, Dong-Hoon; Kim, Chongmin

doi:10.1016/j.ijplas.2011.01.007

Cited by 114 publications

(33 citation statements)

References 30 publications

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“…where G was calculated from the slope of the experimental shear stress-strain curve in the initial linear range, and was set to a reasonable approximation of 0.3 according to (Chung et al, 2011;Kim et al, 2013). Reasonable Young's moduli were obtained for the DP600, TRIP780 and TWIP980, which are 212, 209 and 192 GPa, respectively.…”

Section: Identification Results For the Ahssmentioning

confidence: 99%

Identification of nonlinear kinematic hardening constitutive model parameters using the virtual fields method for advanced high strength steels

Barlat

Kim

et al. 2016

International Journal of Solids and Structures

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In this work, the nonlinear kinematic hardening combined with Voce isotropic hardening was selected to characterize the material behavior of advanced high strength steel sheet samples subjected to a few reverse loading cycles. Multi-components of backstress were considered for the combined nonlinear kinematical hardening model, namely, one, two, and three backstress components. To calibrate the model, an inverse problem solution tool, so-called virtual fields method, which takes full advantage of full-field deformation measurement, was applied to identify the material constitutive parameters. First, finite element simulations of forward-reverse simple shear were performed to validate the proposed identification method. The influence of strain noise on the identification accuracy was also evaluated. Then, the proposed method was applied to three kinds of sheet metals (DP600, TRIP780 and TWIP980) tested under two cycles of forward-reverse simple shear for parameter identification. The identification results obtained with different number of backstress components were critically discussed.

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Section: Identification Results For the Ahssmentioning

confidence: 99%

Identification of nonlinear kinematic hardening constitutive model parameters using the virtual fields method for advanced high strength steels

Barlat

Kim

et al. 2016

International Journal of Solids and Structures

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“…where Poisson's ratio is set to 0.3, which is a reasonable approximation for the selected AHSS according to (Chung et al, 2011;Kim et al, 2013). The calculated Young's moduli are 212, 209…”

Section: Materials and Experimentsmentioning

confidence: 99%

Application of the virtual fields method to the identification of the homogeneous anisotropic hardening parameters for advanced high strength steels

Barlat

Kim

et al. 2017

International Journal of Plasticity

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In the present paper, an inverse problem solution so called the virtual fields method (VFM) is implemented to identify the parameters of the homogeneous anisotropic hardening (HAH) model, a distortional plasticity-based model that describes the material plastic behavior when subjected to strain path changes. The framework of the identification method that combines the formulation of the yield condition, the constitutive stress-strain relation and the principle of virtual work is presented. For validation purpose, the proposed identification method was first attempted on finite element (FE) generated data for a forward-reverse simple shear test to investigate its capability in retrieving the input constitutive parameters. The influence of noise was also evaluated. Then, the identification method was applied to a selection of advanced high strength steel (AHSS), namely DP600, TRIP780 and TWIP980, sheet specimens, subjected to a small number of forward-reverse simple shear cycles. The material constitutive parameters were identified using the VFM based on which shear stress-strain curves were calculated and compared with their experimental counterparts. Good agreement was found between the calculated and the experimental curves despite the larger discrepancies observed in the reverse loading paths. To adjust these discrepancies, the original HAH model was modified with respect to the permanent softening related state variables. After modification, the model was simplified with only one state variable related to permanent softening. It was found that the discrepancies observed in the reverse loading paths were reduced with the modified HAH model.

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“…The fracture surface of A880 is typical ductile fracture behavior with deep and uniformly distributed dimples, which indicates the fracture was associated with micro-void growth and coalescence. 34) Despite the grain size and precipitation are influencial to improving toughness, the delamination also plays a role in ductile-tobrittle transition region, 35) and often considered as a fracture energy absorption process and increasing toughness. Additionally, delamination produces dimples, characteristic of ductile fracture shown in Fig.…”

Section: Micrographs Of Fracture Surfacementioning

confidence: 99%

Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb–Ti Ferritic Steel

Ji¹,

Li²,

Tang³

et al. 2016

ISIJ Int.

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A modified damage model for advanced high strength steel sheets

Cited by 114 publications

References 30 publications

Identification of nonlinear kinematic hardening constitutive model parameters using the virtual fields method for advanced high strength steels

Identification of nonlinear kinematic hardening constitutive model parameters using the virtual fields method for advanced high strength steels

Application of the virtual fields method to the identification of the homogeneous anisotropic hardening parameters for advanced high strength steels

Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb–Ti Ferritic Steel

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