Experimental investigation of shear band and shear strain field evolution during blanking of AA6082 sheet

Abstract

Interrupted blanking experiments were performed to study the deformation behavior of AA6082 (T6) sheets. An intentional asymmetry was introduced by having the punch and the die of different edge radii. High-resolution microstructural montages of sheet cross-section were used to experimentally measure the shear strain field during each interrupted blanking experiment. This provided a comprehensive experimentally measured spatial–temporal shear strain field for the blanking process. The shear strain was found to be high and localized at the top and bottom surfaces of the sheet which was in contact with the punch and the die. The shear strain was observed to monotonically reduce and get diffused at the interior of the sheet. The strain distribution was also calculated by finite element simulations and found to be in good agreement with the experimentally measured strain distributions. However, the peak strains predicted by the finite element simulations were always marginally lower than those observed by the experimental observations.

A structural-thermal coupled modeling approach on the formation of adiabatic shear bands in steel sheet blanking process

“…Further, Schmitz et al [2] revealed that shear bands expand along S-shaped traces in case of adiabatic blanking of high-strength steels, also obtaining that material strain rate hardening behavior strongly affects the width and hardness of ASB. Also, ASB formation in blanked AA6082-T6 sheets has been studied experimentally and numerically to capture the shear strain field, showing an intense shear localization around punch-die corners [3]. In addition, burr formation on sheared surface has been analyzed numerically in ABAQUS in case of AA6082-T6 blanked sheets, revealing a severe strain concentration around punch corner, while higher punch radius and clearance increased burr height [4].…”

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

“…Last but not least, sub-grains and high-angle boundaries were detected in the shear zone due to the twinning rotation. Sonkamble et al [4] studied experimentally and numerically the influence of punch and die radii on shear localization in AA6082 by examining different radii for punch and die. The results indicated that shear strain was initially localized around punch-die corners, while a sharper punch of smaller radius showed greater maximum shear strain compared to a smoother die of slightly greater radius.…”