Characterization of Trimmed Edge of Advanced High Strength Steel

Nasheralahkami, Saeid; Golovashchenko, Sergey F.; Pan, Kaicen; Brown, Lindsay; Gugnani, Bindiya

doi:10.4271/2016-01-0358

Cited by 14 publications

(6 citation statements)

References 25 publications

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“…In general, in such processes, increasing the clearance results in rougher edges and a larger deformation zone, thereby reducing the material's deformation capacity [13]. In the contrast, as mentioned above, if the clearance decreases better results will be obtained, but the clearance cannot be null.…”

Section: Discussionmentioning

confidence: 98%

“…In addition, the sheet may bend and deform because of tensile stresses if the clearance is too large [12]. Therefore, by increasing the clearance, the subsequent deformation capacity of the material is decreased [13] and better results will be obtained with low values of clearance. However, zero values cannot be used and usually values between 5 and 10% of the sheet thickness are used.…”

Section: Introductionmentioning

confidence: 99%

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Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

Claver,

Acosta,

Barba

et al. 2024

Metals

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Sheet metal forming processes are widely used in applications such as those in the automotive or aerospace industries. Among them, punching is of great interest due to its high productivity and low operating cost. However, it is necessary to optimize these processes and adjust their parameters, such as clearance, shear force or tool geometry, to obtain the best finishes and minimize crack generation. Thus, the main objective of this research work is to optimize the punching process to achieve parts that do not require subsequent processes, such as deburring, by controlling the properties of the starting materials and with the help of tools such as design of experiments and simulations. In the present study, tensile tests were performed on three steels with different compositions and three sample geometries. The information obtained from these tests has allowed us to determine the parameters of the Johnson–Cook damage criteria. Moreover, punching was performed on real parts and compared with simulations to analyze the percentage of burnish surface. The results obtained show that the methodology used was correct and that it can be extrapolated to other types of die-cutting processes by reducing the percentage of surface fractures and predicting the appearance of cracks. Furthermore, it was observed that clearance has a greater influence than processing speed, while the minimum percentage of the burnish area was observed for the minimum values of clearance.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

Claver,

Acosta,

Barba

et al. 2024

Metals

View full text Add to dashboard Cite

show abstract

“…An analysis of the material hardness in the sheared zone and the occurring cutting forces and their parameter-dependent variation, cutting surface characteristics was determined by tactile measurement. In works [15,16], the impact of cutting tool wear on deformation of the cut edge and burr formation was analysed. Authors of works [17] analyzed the influence of the parameters of the trimming process on the course of the plastic flow and cracking phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of cutting clearance in shear-slitting process on the residual stress and cut surface quality of AA6111-T4 aluminum alloy

Bohdal

2024

J. Mech. Eng. Sci.

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The paper presents the problem of the correct selection of the cutting clearance during the cutting process of aluminum alloys on circular shears. Currently, production lines lack correct guidelines on how to set the cutting clearance depending on the type of aluminum alloy and its thickness. This causes defects in the products and accelerated wear of the cutting tools.The paper presents the results of experimental and numerical research related to the process of shear-slitting of t = 1 mm AA6111-T4 aluminum alloy. During the experimental studies, it was determined how the value of the clearance affects the characteristic features of the cut edge and deviations of the shape of the product. Using numerical tests, the influence of the clearance value on the stress values in the cutting zone was determined. For the AA6111-T4 aluminum alloy, the highest product quality was obtained using clearances hc = 0.09 mm and hc = 0.12 mm. The conducted experimental research can be useful on production lines in the aspect of the correct selection of technological parameters of the process due to the adopted energy and quality criteria.

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“…Dual phase (DP) Steel sheets are widely used in automotive industries. Their complex microstructure with soft ferrite matrix and hard martensite islands, leads them to represent good combination of strength and formability and have high potential for reducing weight components [1]. However, some challenges still remain in their forming processes.…”

Section: Introductionmentioning

confidence: 99%

Adjustment of fracture locus to improve edge crack resistance

Habibi

Münstermann

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Edge crack sensitivity of advanced high strength steels is posing challenges in forming the sheets with shear-cut edges. In fact, cutting process reduces formability of material by leaving residual damage at the cut edges and makes it prone to edge cracking. The difficulty of the problem mainly lies in the complex loading path that sheets undergo through shear-cutting and the subsequent forming processes. In other words, the stress state evolves from pure-shear to plane-strain during cutting process and changes to mostly uniaxial tension during the following hole-expansion test. The present study aimed to investigate the physical mechanism underlying the formation of edge cracks. The overall aim of the study is to tailor an improved microstructural configuration leading to a significantly reduced edge crack sensitivity. As a first step in this process, an artificial fracture locus is iteratively identified which promises to improve edge crack resistance. In this regard, a dual phase steel was considered as reference material and its fracture locus was calibrated based on uncoupled Bai-Wierzbicki fracture model. The artificial fracture locus representing a virtual material with improved edge crack resistance changed in a way that lower residual damage was inherited from the cutting process, which consequently improved the hole-expansion ratio.

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Characterization of Trimmed Edge of Advanced High Strength Steel

Cited by 14 publications

References 25 publications

Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

Study and Optimization of the Punching Process of Steel Using the Johnson–Cook Damage Model

Effect of cutting clearance in shear-slitting process on the residual stress and cut surface quality of AA6111-T4 aluminum alloy

Adjustment of fracture locus to improve edge crack resistance

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