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中文摘要：
基于考虑晶粒尺寸和取向的弹性黏塑性本构模型,针对3组不同尺寸和取向分布的数字化微观结构模型,采用有限元模拟的方法分析晶粒尺寸和取向分布对纳米晶体材料拉伸力学性能的影响.结果表明：晶粒的尺寸和取向对纳米晶体材料的力学性能有着很明显的影响,且晶粒尺寸分布对力学性能的影响比取向分布的影响要显著.同时,尺寸均匀分布的晶粒中产生的剪切带相对于非均匀分布的晶粒中产生的要均匀,可以减小材料软化的局部性,较好地提高了材料的拉伸强度和韧性。
英文摘要：
An elastic-viscoplastic constitutive model for nancrystalline materials with respect to grain size and orientation was proposed. From the numerical simulation of three cases with different grain size and orientation distributions, the grain size and orientation effects were quantitatively analyzed.The grain size and orientation had obvious effects on the overall mechanical behavior of nanoerystalline materials, especially the grain size distribution.The shear bands in uniform grain size distribution were more uniform than that in nonuniform grain size distribution.That could effectively reduce the material softening locality and improve the tensile strength and ductility of nanocrystalline materials.
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