Bending of Wide Thick Mild Steel Plate (the 2nd report)

Abstract

In the first report, stress and strain distribution of a thick steel plate under uniform plastic bending in plane strain state was analysed, and a new method of bending test was proposed.In this paper, bending stress and strain distribution of the plate in plane stress field was analysed and calculated results were compared with experiment ones, and some differences in bending stress and strain distribution between the two cases were discussed.True stress and true strain relations of the material used in these analysis were obtained by tension test of wide thin plate and compression test of short round bar cut from the same material used in bending tests, and these relations were compared with Bridgeman's corrected one.From these results, the following conclusions were obtained.(1) Stress and strain relation by tension test of wide thin plate is more effective rather than Bridgeman's corrected one for analysis of uniform bending in the both cases.(2) Bending strain in compressive side of the plate in plane stress field is a little smaller than one in plane strain field, but slope of bending strain distribution on convex surface of the plate in the both fields is nearly equal at the same bending strain level on convex surface of the plate.(3) Bending stress on convex surface of the plate in plane stress field is smaller than one in plane strain field, and slope of bending stress distribution on convex surface of the plate in plane stress field is a little smaller than one in plane strain field at the same bending strain level on convex surface of the plate.(4) Bending moment of the plate in plane stress field is a little smaller than one in plane strain field at the same bending strain level on convex surface of the plate.