Springback comparison between DP600 and DP800 steel grades

Almeida, Christyane Oliveira Leao; Lima, Luis Henrique Lopes; Pereira, Marcelo dos Santos

doi:10.1088/2053-1591/ab664e

Cited by 3 publications

(1 citation statement)

References 9 publications

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“…Through experiment and numerical calculation, Su et al [10] proved that the thickness of strip material directly affects the springback. Almeida et al [11] rolled the DP600 and DP800 materials in the directions of 0° and 90° respectively, and compared the size of the springback angle. It was concluded that anisotropy and steel grade change are the main factors affecting the springback.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the effect of holes on the springback in cold roll forming of UHSS

Liu

Pan

liu

et al. 2021

Preprint

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Ultra-high strength steel (UHSS) pre-notched sections are getting growing popularity in the automotive industry with the development of automotive lightweight. However, the springback of UHSS products is large, and the existence of holes also has an effect on the springback. Accurate prediction of springback of UHSS pre-notched products in cold roll forming ( CRF ) is a key issue to be solved. In this paper, the effect of holes on the springback of UHSS in CRF is discussed by simulation and experiment. The finite element model of pre-notched car threshold was constructed, and its accuracy was validated by continuous CRF experiment. The mathematical model of variable elastic modulus determined by tensile tests of martensite (MS) 1300 was applied in finite element model. The accuracy of springback was improved by 15% in the hole region by using variable elastic modulus . Several forming schemes were designed to research the effect of different features on the springback in the hole region. The results show that the existence of holes reduces the springback and the effect is different at different positions of the car threshold. The springback in the hole region decreases with the increase of the number of stands, the strip thickness and the hole diameter, and with the decrease of the distance between stands and the distance between holes. This study provides a help for reducing the influence of holes on the springback and improving the forming precision of pre-notched sections in the actual production of CRF.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of the effect of holes on the springback in cold roll forming of UHSS

Liu

Pan

liu

et al. 2021

Preprint

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Analysis of the springback effect of laser welded DP600 high-strength steel thin sheets

Almeida,

Santos,

Panziera

et al. 2023

Journal of Laser Applications

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Steel sheets are produced with increasingly smaller thicknesses, without compromising the properties of the steel, maintaining ductility, strength, and energy absorption after impact can total depth enhance vehicle energy efficiency, lower manufacturing costs, and address the springback effect. The springback effect of laser-welded DP600 two-phase steel sheets was studied in this research. Parameters such as punching speed, initial bending angle, and time were varied. Tests including tensile tests, Vickers hardness, and optical microscopy analysis were conducted to correlate results with material properties. Autogenous laser welding joined DP600 steel plates at the bending position. Controlling springback ensures better quality in vehicle manufacturing and assembly. The results revealed that increasing the punch descent speed from 4 to 12 mm/min, for an internal angle of 90°, on the first day of observation, led to higher springback values (0.58°–3.3°, respectively), while increasing the initial curvature angle (30°–90°), maintaining a constant speed of 4 mm/min on the first day of observation, and impacting the elastic return (6.74°–0.58°, respectively). Furthermore, the observation time demonstrated a continuous increase in the springback variation during 6 days after the flexural test before stabilization (6.89°– 8.7°), maintaining a constant value of 8 mm/min and the internal angle of doubles of 30°.

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Size Effect on the Post-Necking Behaviour of Dual-Phase 800 Steel: Modelling and Experiment

et al. 2023

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This work investigated the feasibility of using a miniaturised non-standard tensile specimen to predict the post-necking behaviour of the materials manufactured via a rapid alloy prototyping (RAP) approach. The experimental work focused on the determination of the Lankford coefficients (r-value) of dual-phase 800 (DP800) steel and the digital image correlation (DIC) for some cases, which were used to help calibrate the damage model parameters of DP800 steel. The three-dimensional numerical simulations focused on the influence of the size effect (aspect ratio, AR) on the post-necking behaviour, such as the strain/stress/triaxiality evolutions, fracture angles, and necking mode transitions. The modelling showed that although a good correlation can be found between the predicted and experimentally observed ultimate tensile strength (UTS) and total elongation. The standard tensile specimen with a gauge length of 80 mm exhibited a fracture angle of ∼55°, whereas the smaller miniaturised non-standard specimens with low ARs exhibited fractures perpendicular to the loading direction. This shows that care must be taken when comparing the post-necking behaviour of small-scale tensile tests, such as those completed as a part of a RAP approach, to the post-necking behaviours of standard full-size test specimens. However, the modelling work showed that this behaviour is well represented, demonstrating a transition between the fracture angles of the samples between 2.5 and 5. This provides more confidence in understanding the post-necking behaviour of small-scale tensile tests.

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Springback comparison between DP600 and DP800 steel grades

Cited by 3 publications

References 9 publications

Experimental and numerical investigation of the effect of holes on the springback in cold roll forming of UHSS

Experimental and numerical investigation of the effect of holes on the springback in cold roll forming of UHSS

Analysis of the springback effect of laser welded DP600 high-strength steel thin sheets

Size Effect on the Post-Necking Behaviour of Dual-Phase 800 Steel: Modelling and Experiment

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