Fracture Response in Hot-Stamped Tailor-Welded Blanks of Ductibor® 500-AS and Usibor® 1500-AS: Experiments and Modelling

Samadian, Pedram; O’Keeffe, Cameron; Butcher, Cliff; Worswick, Michael J.

doi:10.1016/j.engfracmech.2021.107864

Cited by 15 publications

(6 citation statements)

References 33 publications

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“…Finite element analysis (FEA) was employed to validate the stress state within the coupons. Subsequently, the numerical results obtained from the FEA were compared to the experimental data acquired through digital image correlation (DIC) strain measurement [8,[33][34][35][36]. The proportional fracture locus of the DP1180 steel was then calibrated and lengthscale effects of the finite-elements model and DIC discussed.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Fracture Characterization of DP1180 Steel in Combined Simple Shear and Uniaxial Tension

Khameneh

Abedini

Butcher

2023

Metals

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Current tests for plane stress characterization of fracture in automotive sheet metals include simple shear, uniaxial, plane strain, and biaxial tension, but there is a significant gap between shear and uniaxial tension. Presently, it remains uncertain whether the fracture strain experiences a reduction between simple shear and uniaxial tension or undergoes an exponential increase as the triaxiality decreases. Fracture in combined simple shear and tension is complicated by premature edge cracking in tension along with a strong sensitivity of fracture strain to the measurement lengthscale. To address these issues, several existing simple shear geometries were modified and evaluated, with a focus on obtaining approximately linear strain paths corresponding to combined uniaxial tension and simple shear suitable for experimental fracture characterization using digital image correlation (DIC). An experimental and numerical investigation was conducted using two planar geometries that do not require through-thickness machining and can be easily tested on a universal test frame. Finite-element analysis was used to investigate the influence of the notch eccentricity on the stress state and predicted fracture location. The most promising geometry in each coupon type was then selected and tested for a dual-phase advanced high-strength steel, DP1180. The performance of the two planar geometries was evaluated based on the linearity of strain and stress state, along with the location of fracture initiation. The best geometry was then used to evaluate and recalibrate the modified Mohr-Coulomb (MMC) fracture locus with data in combined shear and tension. The initial MMC calibration using four fracture tests that suppressed necking provided an accurate estimate for the fracture strain in combined uniaxial tension and simple shear. The MMC model correctly predicted a valley in the fracture strain between these two loading conditions.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Fracture Characterization of DP1180 Steel in Combined Simple Shear and Uniaxial Tension

Khameneh

Abedini

Butcher

2023

Metals

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“…[16,17] To integrate ductile areas on the press-hardened component, the state of the art reports several tailored technologies that can be divided into two main classes: tailored blank technologies and tailored process technologies. [1] The tailored blank technologies include: 1) tailored rolled blanks (TRB), [18] 2) tailored welded blanks (TWB), and [19] 3) patchwork blanks. [20] These tailored blank technologies are technologies that differentiate the mechanical properties by varying the thickness of the blank or by joining blank with different mechanical properties or by overlapping blanks with different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

“…The tailored blank technologies include: 1) tailored rolled blanks (TRB), [ 18 ] 2) tailored welded blanks (TWB), and [ 19 ] 3) patchwork blanks. [ 20 ] These tailored blank technologies are technologies that differentiate the mechanical properties by varying the thickness of the blank or by joining blank with different mechanical properties or by overlapping blanks with different thicknesses.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Intermediate Precooling Parameters on the Mechanical Properties of a Tailored Press‐Hardened Component in Advanced High‐Strength Steel

Palmieri,

Tricarico

2023

steel research int.

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In recent years, several automotive companies have studied new tailored tempering technologies for press hardening process to produce structural components with tailored mechanical properties, that is, component with both soft zones to absorb energy and hard zones to avoid intrusion during an impact. One of these technologies involves a tailored tempering station interposed between the austenitization furnace and the press machine in which classical stamping and quenching phases occur. In the tailored tempering station, areas that are desired to be ductile are cooled, while areas with the final high mechanical properties remain at the complete austenitization temperature. This work investigates this new tailored tempering technology by means of finite‐element models and experimental lab‐scale tests. The aim is understanding the influence of cooling rate and the dwell time in the tempering station (precooling time) on the formability and mechanical and microstructural properties of the stamped part. Two different cooling ways of soft areas are explored: 1) by a cooled mask and 2) by a mask with compressed air. Results indicate that an increase in precooling time leads to greater softening in the ductile region but also leads to formability challenges. These effects are even more pronounced with a higher cooling rate.

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“…Meanwhile, induction heating and infrared heating have received much attention in partial heating applications [2,28]. Tailored blanks and an integrated design approach have improved the material utilization and overall performance of components [29][30][31][32]. It is worth mentioning that integrated design, such as single and double door rings, has become a popular issue in light weighting.…”

Section: Introductionmentioning

confidence: 99%

Low-Carbon-Emission Hot Stamping: A Review from the Perspectives of Steel Grade, Heating Process, and Part Design

Hou,

Liu,

et al. 2023

Automot. Innov.

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Hot stamping steels have become a crucial strategy for achieving lightweighting and enhancing crash safety in the automotive industry over the past two decades. However, the carbon emissions of the materials and their related stamping processes have been frequently overlooked. It is essential to consider these emissions during the design stage. Emerging materials and technologies in hot stamping pose challenges to the automotive industry's future development in carbon emission reduction. This review discusses the promising materials for future application and their special features, as well as the emerging manufacturing and part design processes that have extended the limit of application for new materials. Advanced heating processes and corresponding equipment have been proven to improve heating efficiency and control temperature uniformity. The material utilization and the overall performance of the components are improved by tailored blanks and an integrated part design approach. To achieve low-carbon-emission (LCE) hot stamping, it is necessary to systematically consider the steel grade, heating process, and part design, rather than solely focusing on reducing carbon emissions during the manufacturing process stage. This review aims to present the latest progress in steel grade, heating process, and part design of hot stamping in the automotive industry, providing solutions for LCE from a holistic perspective.

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Fracture Response in Hot-Stamped Tailor-Welded Blanks of Ductibor® 500-AS and Usibor® 1500-AS: Experiments and Modelling

Cited by 15 publications

References 33 publications

Experimental and Numerical Fracture Characterization of DP1180 Steel in Combined Simple Shear and Uniaxial Tension

Experimental and Numerical Fracture Characterization of DP1180 Steel in Combined Simple Shear and Uniaxial Tension

Effects of the Intermediate Precooling Parameters on the Mechanical Properties of a Tailored Press‐Hardened Component in Advanced High‐Strength Steel

Low-Carbon-Emission Hot Stamping: A Review from the Perspectives of Steel Grade, Heating Process, and Part Design

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