A comprehensive investigation on the damage induced by the shearing process in DP780 steel

Han, Shuo; Chang, Ying; Han, Dong

doi:10.1016/j.jmatprotec.2021.117377

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…The amount of burr increases with the increase in the clereance. This situation has also been observed in similar studies in the literature [8,10]. The amount of burr size in blanking operations made with radial punch is approximately 1% or less.…”

Section: Resultssupporting

confidence: 82%

“…The rollover amounts increase with the increase in the clearance value in all punch types. The results of other researchers in the literature also support this situation [8,9,15] Fig. 3.…”

Section: Resultssupporting

confidence: 76%

“…When the studies on the blanking process in the literature in recent years are examined; Han et al investigated the effect of blanking clearance by using three different clearance values (5%, 10%, 15%) in blanking DP780 dual-phase steel sheet with 1.6 mm thickness using experimental and finite element methods. Depending on the increase in the amount of blanking clearance, the amount of work hardening, burr length, and rollover increased [8]. In the study of Basak et al, the blanking processes of three different (TRIP steel, hot-stamped (HS) steel, and aluminum alloy 5182) automotive sheet metal were investigated through experimental and finite element methods.…”

Section: Introductionmentioning

confidence: 99%

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An Investigation of Punch Radius and Clearance Effects on the Sheet Metal Blanking Process

Çavuşoğlu

2022

International Journal of Automotive Science and Technology

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In this study, the effects of punch edge radius and blanking clearance on product quality and blanking process in blanking of AISI 304 stainless steel sheet were investigated by using the fi-nite element analysis method. The blanking analyzes were performed at four different punch tip radii (0.01, 0.25, 0.5, 1 mm) and three different blanking clearance (1 %, 5%, 10%). As a result of the analysis, rollover, burr length increased, smooth sheared / fractured surface ratio and blanking force decreased with the increase in blanking clearance. Depending on the increase in the amount of punch tip radius, the blanking force, and burr length also increased, and the smooth sheared / fractured surface ratio decreased compared to the blanking process with flat punches.

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Section: Resultssupporting

confidence: 82%

“…The rollover amounts increase with the increase in the clearance value in all punch types. The results of other researchers in the literature also support this situation [8,9,15] Fig. 3.…”

Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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An Investigation of Punch Radius and Clearance Effects on the Sheet Metal Blanking Process

Çavuşoğlu

2022

International Journal of Automotive Science and Technology

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“…It should be noted that the fracture line is created based on experimental observation because the damage modelling in blanking process and in particular the damage model calibration requires significant effort [8]. But in the future, we plan to take damage into account with the help of simple models like other researchers [9] who successfully used a simple Cockroft-Latham model to investigate damage induced by shearing process. They showed that the model can be calibrated using blanking tests and finite element modelling.…”

Section: Numerical Aspectsmentioning

confidence: 99%

Optimum blanking clearance choice method by an approach coupling experimental trials and simulations

Schreiber

Rizk

Rachik

et al. 2022

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

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Blanking process of sheet metal is accomplished by a shearing action on a thin plate placed between two sharp cutting edges, known as “punch” and “die”. The main problem of this sheet metal cutting technology, that causes major shutdowns of the press machine, is the punch wear. Among all blanking parameters, the clearance set between the punch and the die has the major influence on tool wear. In this context, our study focuses on identifying the optimum blanking clearance that guarantees a maximum abrasion and chipping wear reduction for different sheet metal materials and different blanking operations. The developed approach combines experimental blanking tests and numerical simulation of blanking processes. Based on assumptions made in this paper, links are established between the stripping force and the abrasive wear behaviour of punching tools and also between the maximum pressure on the face of the punch and the risk of chipping. Using these links, criteria have been developed allowing to propose an optimum blanking clearance for all the configurations tested in this paper. A next step of this study consists on applying the optimum punch-die clearances in a variable way along a complex blanking shape and realizing experimental tests to compare the results (tool life and edge quality) with a constant blanking clearance.

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“…Edge cracking is sensitive to the quality of the manufactured edge. Some widely used manufacturing processes, such as the shearing cutting technique, induce a high amount of damage and roughness at the edge and make the further formation of the edge problematic [6]. By controlling and designing the microstructural features of DP steels, their damage mechanisms and sensitivity to edge cracking can be improved.…”

Section: Introductionmentioning

confidence: 99%

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

et al. 2022

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In the present work, the microstructural damage behavior of two DP1000 steel test subjects through various stress states was studied to thoroughly learn the interaction between microstructure, damage evolution, and edge stretchability. In addition, microstructural changes at the fracture sites and fracture surfaces were observed using a scanning electron microscope. The distinctive mechanical and damage behaviors of the materials were revealed. However, the steels were slightly different in chemical composition, microstructural characteristics, and yield stress. The results showed that when microstructural and mechanical properties of phases were more similar, i.e., the microstructure was more homogenous, the damage was initiated by cracking at ferrite-martensite interfaces, and it propagated along the loading direction. This allowed the material to represent high local formability and significant necking. In contrast, by increasing the dissimilarity between ferrite and martensite phases, damage propagated by the shear linking of the voids hindered local deformation of the material and led it to sudden fracture after negligible necking. These distinct damage evolutions noticeably influenced the materials’ edge stretchability. Since higher local formability favors the edges with higher resistance to cracking, the hole expansion ratio increases, as clearly observed throughout the current study.

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A comprehensive investigation on the damage induced by the shearing process in DP780 steel

Cited by 9 publications

References 24 publications

An Investigation of Punch Radius and Clearance Effects on the Sheet Metal Blanking Process

An Investigation of Punch Radius and Clearance Effects on the Sheet Metal Blanking Process

Optimum blanking clearance choice method by an approach coupling experimental trials and simulations

Effects of Microstructural Properties on Damage Evolution and Edge Crack Sensitivity of DP1000 Steels

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