Since high-strength steel sheets,driven by the demand for weight reduction of auotmotive body,possess the strong anistropy and lower formability,there is a great requirement to improve the formability by introducing the numerical simulation technology in the fields of material process and sheet fabrication.In this paper,a textural target design method is proposed to improve the formability of the conventional high-strength steel sheets.First,an artificial gamma fiber texture is defined in terms of a rotationally symmetric Gaussian disrtribution of deviation angles,which has a certain scatter width along the given skeleton line in Euler angle coordinate space.The analytic textures are designed by introducing the artificial gamma fiber textures into the conventional high-strength steel.The blending coefficient is selected as the design parameter.Then,an optimum crystallographic texture is found through the limit dome height formability tests by employing an objective function,which is evaluated by a maximum thinning ratio of the deformed sheet.Further,it is demonstrated that a sheet with the optimum textures shows the best straining in VDI benchmark tests.
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