Applications of Crystalline Plasticity Model to Sheet Metal Surface Roughening and Micro-Forming Procedures
Date Issued
2010
Date
2010
Author(s)
Chen, Chi-Luen
Abstract
A Taylor-type crystalline plasticity model, implemented into the commercial finite element analysis software, is coded as a subroutine to investigate behaviors of an aluminum alloy with a face-centered cubic structure, in the present study. An optical microscope with an electron backscatter diffraction technique is used to evaluate grain morphology and microtexture of a metal sheet. A plane-strain model is adopted to examine the effects of the number of element layers through the thickness and spatial distribution of crystallographic orientations on the roughness of the sheet. Surface profiles of the textured sheet, subjected to the uniaxial tensile in the longitudinal and the transverse direction, are evaluated by using a solid model. Various values of pressure are subsequently prescribed on the pre-strained sheet to explore deviations of the surface roughness. Measured grain morphology and microtexture are further implemented into the simulations here. Numerical results are also compared with the associated experimental measurements reported in the literature.
The crystalline plasticity model is also applied to investigate the behavior of a stainless steel sheet here. Thickness variations of the sheet are examined under the micro-groove formation procedures. Effects of the spatial distribution of crystallographic orientations and orientation assignment approach adopted in the simulations on the thickness distribution over the sheet are demonstrated. Numerical results, based on the sheet with textured orientations, are in good agreement with the corresponding experimental measurements reported in the literature.
Subjects
crystalline plasticity model
surface roughness
micro-forming
finite element analysis
Type
thesis
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