Fracture characterization of tailored Usibor® 1500-AS and damage modelling based on a coupled-micromechanical-phenomenological strategy

Samadian, Pedram; Kortenaar, Lukas ten; Omer, Kaab; Butcher, Cliff; Worswick, Michael J.

doi:10.1016/j.engfracmech.2019.106785

Cited by 18 publications

(5 citation statements)

References 49 publications

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“…The nominal weight of the Al–Si coating is 70–90 g m −2 per side. To prepare the material for welding, 300 by 300 mm blanks were heated for 6 min at 930°C, followed by die quenching (clamping between water-cooled flat dies) in an automated press under a clamping force of 60 tons for 10 s. The nominal tensile strength of U1500 after hot-stamping is 1500 MPa with a minimum elongation of 5% [15].…”

Section: Methodsmentioning

confidence: 99%

Shear band formation at the fusion boundary and failure behaviour of resistance spot welds in ultra-high-strength hot-stamped steel

Mohamadizadeh

Biro

Worswick

2020

Science and Technology of Welding and Joining

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The failure of resistance spot welds in ultra-high-strength press-hardened steels often occurs due to martensite tempering in the heat-affected zone. In the present work, however, it is shown that the failure occurs by local shear band formation at the fusion boundary (FB) in spot welds in press-hardened 22MnB5 (Al-Si coated). The failure behaviour of spot welds was investigated to understand failure mechanisms with respect to microstructural features. The results showed that a 104 μm wide shear band is located in a local area of softening adjacent to the FB. A finemeshed model was developed using hardness-based local properties to simulate the softened zone which was able to capture the observed failure at the FB interface.

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Section: Methodsmentioning

confidence: 99%

Shear band formation at the fusion boundary and failure behaviour of resistance spot welds in ultra-high-strength hot-stamped steel

Mohamadizadeh

Biro

Worswick

2020

Science and Technology of Welding and Joining

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“…The Generalized Incremental Stress-State-Dependent Damage Model (GISSMO) is a theoretical framework designed to forecast the instability, softening, and fracture behaviors of metallic materials [ 45 , 46 , 47 ]. Initially introduced and enhanced by [ 48 , 49 , 50 , 51 ], the GISSMO model primarily employs a nonlinear method for damage accumulation to establish its damage criterion.…”

Section: Machine Learning Algorithm For Prediction Of Forming Limit D...mentioning

confidence: 99%

Numerical Optimization of Variable Blank Holder Force Trajectories in Stamping Process for Multi-Defect Reduction

Guo,

Jeong,

Park

et al. 2024

Materials

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An intelligent optimization technology was proposed to mitigate prevalent multi-defects, particularly failure, wrinkling, and springback in sheet metal forming. This method combined deep neural networks (DNNs), genetic algorithms (GAs), and Monte Carlo simulation (MCS), collectively as DNN-GA-MCS. Our primary aim was to determine intricate process parameters while elucidating the intricate relationship between processing methodologies and material properties. To achieve this goal, variable blank holder force (VBHF) trajectories were implemented into five sub-stroke steps, facilitating adjustments to the blank holder force via numerical simulations with an oil pan model. The Forming Limit Diagram (FLD) predicted by machine learning algorithms based on the Generalized Incremental Stress State Dependent Damage (GISSMO) model provided a robust framework for evaluating sheet failure dynamics during the stamping process. Numerical results confirmed significant improvements in formed quality: compared with the average value of training sets, the improvements of 18.89%, 13.59%, and 14.26% are achieved in failure, wrinkling, and springback; in the purposed two-segmented mode VBHF case application, the average value of three defects is improved by 12.62%, and the total summation of VBHF is reduced by 14.07%. Statistical methodologies grounded in material flow analysis were applied, accompanied by the proposal of distinctive optimization strategies for the die structure aimed at enhancing material flow efficiency. In conclusion, our advanced methodology exhibits considerable potential to improve sheet metal forming processes, highlighting its significant effect on defect reduction.

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“…To independently evaluate the fracture strain correlation in Equation ( 9), a separate dataset comprising 26 different AHSS test conditions ranging from 590 MPa to 1500 MPa was compiled from the literature [11,14,17,18,[25][26][27]. It is important to note that this diverse range of AHSS includes 13 steels with strengths lower than 780 MPa, which was the lowest strength level used in the calibration of Equation (9).…”

Section: Evaluation Of Bend Performance With Tensile Propertiesmentioning

confidence: 99%

“…Material conditions of AHSS classes with multiple variants from the literature [11,14,17,18,[25][26][27] for the prediction model evaluation.…”

Section: Tablementioning

confidence: 99%

Characterization and Prediction of Plane Strain Bendability in Advanced High-Strength Steels

Cheong,

Noder,

Zhumagulov

et al. 2023

Metals

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The rapid development of new classes of automotive steels such as the 3rd generation of advanced high-strength steels has created the need for the efficient characterization of their mechanical properties in loading scenarios other than uniaxial tension. The VDA 238-100 tight radius bend test has gained widespread acceptance in recent years for characterizing performance in plane strain bending, but there is uncertainty surrounding the use of the bend angle and its interrelation with the test parameters. The objective of the present study is to investigate the intertwined effects of the sheet thickness, bend radius, and tensile properties upon the bendability of seven advanced high-strength steels in different thicknesses for a total of 83 conditions. Practical correlations are developed to predict the bend angle and plane strain fracture strain as functions of the bending conditions and tensile mechanical properties. An extensive dataset comprising 26 additional advanced high-strength steel test cases was compiled from the literature to evaluate the proposed correlation for the plane strain fracture strain.

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Fracture characterization of tailored Usibor® 1500-AS and damage modelling based on a coupled-micromechanical-phenomenological strategy

Cited by 18 publications

References 49 publications

Shear band formation at the fusion boundary and failure behaviour of resistance spot welds in ultra-high-strength hot-stamped steel

Shear band formation at the fusion boundary and failure behaviour of resistance spot welds in ultra-high-strength hot-stamped steel

Numerical Optimization of Variable Blank Holder Force Trajectories in Stamping Process for Multi-Defect Reduction

Characterization and Prediction of Plane Strain Bendability in Advanced High-Strength Steels

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