کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
780426 | 1465096 | 2005 | 12 صفحه PDF | دانلود رایگان |

Fracture limits in sheet stretch bending were theoretically obtained on the assumption that the fracture occurs when the stretching force reaches its maximum value. From the calculated results, a fracture criterion has been presented where limit wall stretch, Lmax/L0 (Lmax: limit wall length of a sheet, L0: initial wall length), is explicitly given as a function of the non-dimensional bending curvature, t0/Rt0/R (t0: sheet thickness, R: bending radius) and the material's work hardening exponent (n-value). To verify this criterion, three-point stretch bending tests with various punch-radii were performed on three types of aluminum sheets (A5182-O, JIS6061-T4 and JIS6N01-T5). The predicted limit wall stretch, as well as limit forming height, were in good agreement with the experimental results.
Journal: International Journal of Mechanical Sciences - Volume 47, Issue 12, December 2005, Pages 1885–1896