Effects of strain localization on surface roughening during sheet forming
Effects of strain localization on surface roughening during sheet forming
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DOI：
10.1016/s1359-6454(97)00182-1
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发表时间：
1998-02-13
期刊：
影响因子：
9.4
通讯作者：
Becker, R
中科院分区：
文献类型：
--
作者：
Becker, R
对板材表面粗糙化过程进行了数值模拟，以确定微观组织和力学性能的影响。该模型考虑了片材表面附近的晶粒结构，其中晶粒的行为由本构模型表征，该本构模型考虑了由晶体滑移引起的变形和晶格随变形的旋转。除了已知的应变和晶粒尺寸的表面粗糙化的线性依赖性，它被确定，在表面的小规模应变局部化起着重要的作用。因此，影响应变局部化的因素，如应变硬化，晶体织构和材料均匀性，也影响表面粗糙化。结果还显示图案化的应变局部化，这是由多晶体中固有的材料不均匀性引起的。
Numerical simulations of evolving surface roughening in sheet have been preformed to determine the influence of microstructure and mechanical properties. The model accounts for the grain structure near the sheet surface with the behavior of the grains being characterized by a constitutive model which accounts for deformation by crystallographic slip and for rotation of the crystal lattice with deformation. In addition to the known linear dependence of surface roughening on strain and grain size, it was determined that small scale strain localization at the surface plays a significant role. Consequently, factors which affect strain localization, such as strain hardening, crystallographic texture and material homogeneity, also affect surface roughening. The results also show patterning of the strain localization which is induced by the material inhomogeneity inherent in a polycrystal.