PREDICTION OF EARING IN DRAWN CUP BASED ONCRYSTALLOGRAPHIC TEXTURE DATA OF SHEET METAL

摘要

The plastic anisotropy of sheet metal is usually caused bypreferred orientation of grains, which are developed bymechanical deformation and thermal treatment. Since thecrystallographic texture of sheet metals is related toformability, especially earing, the prediction of earing withtexture data is very important for the control of anisotropy ofsheet metals in blank pre-processsing. In this paper, a methodof earing prediction with texture data is proposed based oncrystalline plasticity theory. The values of Taylor factor M ondifferent strain paths are calculated for sheet metal with FCCcrystallographic texture based on TBH (Taylor-Bishop-Hill)theory. Then the full yield surface and the curve of plasticstrain ratio R versus loading direction, and the earing profileare determined for LY16 aluminium alloy sheet metal whichhas mixed crystallographic texture. The predicted ears are at0°, 90°, 180° and 270°, which is in good agreement withexperimental result.