A study of edge characteristics of sheared and bent steel plate

Weaver, H. P.; Weinmann, K. J.

doi:10.1007/bf02833660

Cited by 13 publications

(17 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While edge geometry changes with clearance, the hardness contours remained relatively unaVected with peak hardness consistently near 200 DPH along the edge which were consistent with those reported by Weaver [23] and Weaver and Weinmann [26]. At clearances of 1 per cent or less, double cutting occurs where the fracture trajectories from the punch and die diverge and the material contained between the opposing fracture trajectories remains attached as a protrusion on the break surface and is sometimes referred to as a zipfel [27].…”

Section: Evect Of the Blade Gapsupporting

confidence: 90%

“…As the blade gap is increased from the initial value of 0.8 per cent (0.05 mm), the percentage of rollover increases linearly . 4a) and predicted values are seen to be in good agreement with those reported by Weaver and Weinmann [26]. While the model does not show a minimum and slightly underpredicts burnish and overpredicts break (Figs 4a and b), the predicted and experimental results still demonstrate reasonable agreement over the range simulated.…”

Section: Evect Of the Blade Gapsupporting

confidence: 89%

“…3d). The angle for the fracture trajectories was calculated to be 10.4 which compares favourably with the 7±8 range that is typically observed in plate shearing [26]. Thus, in addition to the rollover and burnish, the model is able to simulate satisfactorily the shear angle and fracture trajectories that characterize edge formation in shearing.…”

Section: Incremental Shearingmentioning

confidence: 96%

See 2 more Smart Citations

Assessment of a finite element model for plate shearing

Domblesky

Zhao

2002

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

A study was conducted to assess the robustness of a plane strain ®nite element model that was developed to simulate plate shearing using the Cockroft ±Latham fracture criterion and element deletion. Model predictions for blade gap, ductility and edge wear were compared with published experimental results. Results showed that the model was able to simulate initiation and propagation of fracture lines at the punch and die corners and the resultant break angle along the edge was found to be close to values observed in practice. Simulated edge geometry and microhardness were found to be in reasonable agreement with published experimental results for the steel plate considered although the model was unable to simulate double cutting at 0.8 per cent clearance. Results also suggest that edge hardness is independent of the starting ductility in the plate and that increasing the edge radii does not eVectively simulate edge wear. Based on the results obtained, it may be concluded that the plane strain model is able to simulate plate shearing with su cient accuracy in the range of normal process conditions.

show abstract

Section: Evect Of the Blade Gapsupporting

confidence: 90%

Section: Evect Of the Blade Gapsupporting

confidence: 89%

Section: Incremental Shearingmentioning

confidence: 96%

See 1 more Smart Citation

Assessment of a finite element model for plate shearing

Domblesky

Zhao

2002

Proceedings of the Institution of Mechanical Engineers, Part B:

View full text Add to dashboard Cite

show abstract

“…The properties of the sheared sheet is also influenced by the properties of the plastically deformed material in a region beneath the cut sheet surface. Micro-hardness testing of sheared samples was used by Weaver and Weinmann (1985) to study the deformation hardening in this region, and Dalloz et al (2009) showed that a heavily deformed sub-surface region contains crack initiating voids.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of strain fields during shearing of medium and high-strength steel sheet

Gustafsson

Karlsson

Oldenburg

2016

Int J Mech Mater Eng

View full text Add to dashboard Cite

Background: There is a shortage of experimentally determined strains during sheet metal shearing. These kinds of data are a requisite to validate shearing models and to simulate the shearing process. Methods: In this work, strain fields were continuously measured during shearing of a medium and a high strength steel sheet, using digital image correlation. Preliminary studies based on finite element simulations, suggested that the effective surface strains are a good approximation of the bulk strains below the surface. The experiments were performed in a symmetric set-up with large stiffness and stable tool clearances, using various combinations of tool clearance and clamping configuration. Due to large deformations, strains were measured from images captured in a series of steps from shearing start to final fracture. Both the Cauchy and Hencky strain measures were considered, but the difference between these were found negligible with the number of increments used (about 20 to 50). Force-displacement curves were also determined for the various experimental conditions. Results: The measured strain fields displayed a thin band of large strain between the tool edges. Shearing with two clamps resulted in a symmetric strain band whereas there was an extended area with large strains around the tool at the unclamped side when shearing with one clamp. Furthermore, one or two cracks were visible on most of the samples close to the tool edges well before final fracture. Conclusions: The fracture strain was larger for the medium strength material compared with the high-strength material and increased with increasing clearance.

show abstract

“…The above relationship was modified based on experimental microhardness data as shown by Domblesky [6]. He used non-linear regression analysis and Weaver's hardness data [19] to calculate microhardness from effective strain of AISI 1018 steel. His equation was modified using least squares fit to the AISI 4620 data and used for the present study to calculate effective strain from microhardness.…”

Section: Hardness Predictionsmentioning

confidence: 99%