中文摘要：

Using elastic crystalline viseoplastic finite element(FE)annlysis,the formability of BCCsteel sheets was assessed.An orientation probability assignment method in the FE modeling procedure,whichcan be categorized as an inhomogenized material modeling,was newly proposed.In the study,the crystalorientations of three materials,mild steel,dual phase steel and the high strength steel,were obtained by X-ray diffraction and orientation distribution function(ODF)analyses.The measured ODF results have revealedclearly different textures in the sheets,featured by orientation fibers,skeleton lines and selected orientationsin Euler angle space,which are closely related to the plastic anisotropy.Then,the crystal orientations wereassigned to FE integration points by using this ODF data,individually.The FE analyses of the standard lim-iting dome height(LDH)test show how the fiber textures affect the extent of strain localization in the formingprocesses.It was confirmed by comparison with experimental results that this FE code could predict the ex-treme strain localization and assess the sheet formability.

英文摘要：

Using elastic crystalline viscoplastic finite element (FE) annlysis, the formability of BCC steel sheets was assessed. An orientation probability assignment method in the FE modeling procedure, which can be categorized as an inhomogenized material modeling, was newly proposed. In the study, the crystal orientations of three materials, mild steel, dual phase steel and the high strength steel, were obtained by Xray diffraction and orientation distribution function (ODF) analyses. The measured ODF results have revealed clearly different textures in the sheets, featured by orientation fibers, skeleton lines and selected orientations in Euler angle space, which are closely related to the plastic anisotropy. Then, the crystal orientations were assigned to FE integration points by using this ODF data, individually. The FE analyses of the standard limiting dome height (LDH) test show how the fiber textures affect the extent of strain localization in the forming processes. It was confirmed by comparison with experimental results that this FE code could predict the extreme strain localization and assess the sheet formability.