Fig. 4
From: Experimental study of strain fields during shearing of medium and high-strength steel sheet
Typical speckle pattern on the sheet strip xy-surface: a before shearing start, b just before final fracture, c final fracture immediately after b. The images were captured by the high-speed camera when shearing the high strength material at 0.15h clearance and with two clamps. Note that the dark area on the lower tool is spilled grease and no tool defect. Panel d shows a schematic figure of the shearing. Strains were plotted along the thick dashed line and the largest strain found between the two thinner horizontal dashed lines was tabulated