Effect of the number and orientation of active slip systems on plane strain single crystal indentation
Effect of the number and orientation of active slip systems on plane strain single crystal indentation
复制标题
主动滑移系数量和取向对平面应变单晶压痕的影响
DOI：
10.1088/0965-0393/14/7/001
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发表时间：
2006
影响因子：
1.8
通讯作者：
A. Needleman
中科院分区：
文献类型：
--
作者：
S. Bouvier;A. Needleman
研究了可用滑移系统的数量和方向对模型平面单晶压痕的影响。该晶体具有三个相互成 60° 角的滑移系。该材料采用粘塑性连续滑移理论进行表征。潜在活动滑移系统的数量通过指定每个系统上的流动强度值来控制。注意力仅限于用坚硬的锋利压头对块体进行压痕。考虑具有一个、两个或三个软（因此可能是活性的）滑移系统的晶体。我们还研究了软滑移系统相对于压头方向的影响。给出了硬度、滑移模式、引起的晶格旋转和应力分布的结果。标称压痕硬度与滑移系统强度之间的关系取决于软滑移系统的数量，并且可能与塑性各向同性固体的关系显着不同。对于两个或三个软滑移系统，会发现变形模式涉及主要是单滑移的区域的情况。特别是当存在一种软滑移系统时，可能会形成正平均正应力区域，其位置取决于软滑移系统相对于压头的方向。
The effect of the number and orientation of available slip systems on the indentation of model planar single crystals is investigated. The crystal is taken to have three slip systems oriented at 60° relative to each other. The material is characterized by viscoplastic continuum slip theory. The number of potentially active slip systems is controlled by specifying values of the flow strength on each of the systems. Attention is confined to indentation of a block by a sticking rigid sharp indenter. Crystals with one, two or three soft (and therefore potentially active) slip systems are considered. We also investigate the effect of the orientation of the soft slip system relative to that of the indenter. Results are presented for the hardness, the mode of slip, the induced lattice rotations and the stress distribution. The relation between the nominal indentation hardness and the slip system strength depends on the number of soft slip systems and can differ significantly from that for a plastically isotropic solid. With two or three soft slip systems, circumstances are found where the deformation mode involves regions of predominantly single slip. Particularly when there is one soft slip system, regions of positive mean normal stress can develop, the location of which depends on the orientation of the soft slip system relative to the indenter.