HETEROGENEOUS DEFORMATION OF POLYCRYSTALS SIMULATED WITH MICROPOLAR SINGLE CRYSTAL PLASTICITY

摘要：

The influence of grain size on the flow stress of small scale statistical volume elements (SVEs) is investigated using micropolar single crystal plasticity.In a micropolar single crystal,the presence of couple stresses work-conjugate to the lattice torsion-curvature leads to a non-symmetric Cauchy stress that when resolved on a given slip system gives rise to kinematic hardening during heterogeneous deformation.The scale-dependent response of the micropolar single crystal is dictated by both energetic (higher-order elastic constants) and dissipative (plastic lattice tcrsion-curvature) constitutive length scales.In this work,we investigate how variations in these constitutive length scale parameters affect the scaling behavior of the macroscopic (ensemble average) flow stress.

关键词： nonlocal crystal viscoplasticity polycrystal scaling relations

作者: J.R.Mayeur D.L.McDowell

作者单位: Theoretical Division,Los Alamos National Laboratory,Los Alamos,NM 87545,USA Woodruff School of Mechanical Engineering and School of Materials Science and Engineering,Georgia In

会议类型: 国际会议

会议名称: The Third International Conference on Heterogeneous Material Mechanics(第三届国际非均匀材料力学会议)

会议地点: 上海

会议语种:英文

页码: 381-384

在线出版日期: 2011-05-22（万方平台首次上网日期，不代表论文的发表时间）