Microstructural characterization of blanked surface of C5191 phosphor bronze sheet under ultra-high-speed blanking

Dao-chun, HU; Chen, Minghe; Wang, Lei; Wang, Hongjun

doi:10.1016/s1003-6326(21)65530-9

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…Finally, high hydrostatic pressure induced by a specially designed V-shaped blankholder and die reduced the extent of the fracture zone, improving the quality of the blanked surface. Hu et al [3] experimentally studied C5191 phosphor bronze sheets under an ultra-high-speed blanking test utilizing electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) tools. The microstructural observations showed that the grains were stretched alongside the blanking direction, formulating strip-shaped structures, while the increase in graining misorientation led to fragmented grain layers.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Damage Effect on the Evolution of Adiabatic Shear Banding and Its Transition to Fracture during High-Speed Blanking of 304 Stainless Steel Sheets

Karantza,

Papaefthymiou,

Vaxevanidis

et al. 2024

Materials

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This paper investigates numerically the effect of damage evolution on adiabatic shear banding (ASB) formation and its transition to fracture during high-speed blanking of 304 stainless steel sheets. A structural-thermal-damage-coupled finite element (FE) analysis is developed in LS-DYNA considering the modified Johnson–Cook thermo-viscoplastic model for both plasticity flow rule and damage law, while further, a temperature-dependent fracture criterion is implemented by introducing a critical temperature. The modeling approach is initially validated against experimental data regarding the fracture profile and ASB width. Next, FE simulations are conducted to examine the effect of strain rate and temperature dependence on damage law, while the effect of damage coupling is also evaluated, aiming to highlight the connection between thermal and damage softening and attribute them a specific role regarding ASB formation and transition to fracture. Also, the influence of dynamic recrystallization (DRX) softening is studied macroscopically, while further, a parametric analysis of the Taylor–Quinney coefficient is conducted to highlight the effect of plastic work-to-internal heat conversion efficiency on ASB formation. The results revealed that the implementation of damage coupling reacts to reduced ASB width and provides an S-shaped fracture profile, while it also decreases the peak force and results in an earlier fracture. Both findings are enhanced when accounting further for DRX softening and a higher value of the Taylor–Quinney coefficient. Finally, the simulations indicated that thermal softening precedes damage softening, showing that the temperature rise is responsible for ASB initiation, while instead, damage evolution drives ASB propagation and fracture.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Damage Effect on the Evolution of Adiabatic Shear Banding and Its Transition to Fracture during High-Speed Blanking of 304 Stainless Steel Sheets

Karantza,

Papaefthymiou,

Vaxevanidis

et al. 2024

Materials

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“…One approach to optimising the shear-cutting of ultra-high-strength steels is to exploit high-speed effects in cutting processes [8]. In recent years, the potential of high velocities (v ≥ 10 m/s) in shearcutting has been investigated, analysed and evaluated within the framework of various research projects [9,10]. In so-called high-speed impact cutting (HSIC), early shear failure in the material is exploited by generating adiabatic shear bands [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Design, Numerical and Experimental Testing of a Flexible Test Bench for High-Speed Impact Shear-Cutting with Linear Motors

Krutz,

Leonhardt,

Graf

et al. 2023

JMMP

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Given the use of high-strength steels to achieve lightweight construction goals, conventional shear-cutting processes are reaching their limits. Therefore, so-called high-speed impact cutting (HSIC) is used to achieve the required cut surface qualities. A new machine concept consisting of linear motors and an impact mass is presented to investigate HSIC. It allows all relevant parameters to be flexibly adjusted and measured. The design and construction of the test bench, as well as the mechanism for coupling the impact mass, are described. To validate the theoretically determined process speeds, the cutting process was recorded with high-speed cameras, and HSIC with a mild deep-drawing steel sheet was performed. It was discovered that very good cutting edges could be produced, which showed a significantly lower hardening depth than slowly cut reference samples. In addition, HSIC was numerically modelled in LS-DYNA, and the calculated cutting edges were compared with the real ones. With the help of adaptive meshing, a very good agreement for the cutting edges could be achieved. The results show the great potential of using a linear motor in HSIC.

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Experiment and numerical simulation on the accuracy of hole pieced in the double-sheet piercing application

Leetrakul

Lawanwong

2023

J Braz. Soc. Mech. Sci. Eng.

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Microstructural characterization of blanked surface of C5191 phosphor bronze sheet under ultra-high-speed blanking

Cited by 5 publications

References 18 publications

Numerical Investigation of the Damage Effect on the Evolution of Adiabatic Shear Banding and Its Transition to Fracture during High-Speed Blanking of 304 Stainless Steel Sheets

Numerical Investigation of the Damage Effect on the Evolution of Adiabatic Shear Banding and Its Transition to Fracture during High-Speed Blanking of 304 Stainless Steel Sheets

Design, Numerical and Experimental Testing of a Flexible Test Bench for High-Speed Impact Shear-Cutting with Linear Motors

Experiment and numerical simulation on the accuracy of hole pieced in the double-sheet piercing application

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