期刊
ACTA MATERIALIA
卷 59, 期 7, 页码 2749-2761出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.01.014
关键词
Nanoindentation; Finite-element analysis; Residual stresses; Non-destructive testing
资金
- AWE
Equal biaxial residual stresses (of up to about 175 MPa) have been generated in thin copper foils via differential thermal contraction. These foils were subsequently indented, under displacement control, and the load displacement time characteristics were measured. The applied load required for penetration to a given depth (in a given time) was found to decrease with increasing (tensile) residual stress, in accordance with predictions from a finite-element model (incorporating both plasticity and creep). The main thrust of this paper concerns sensitivities. Relatively small changes in residual stress (of the order of a few tens of MPa) were observed to generate effects that should be detectable via their influence on the nanoindentation response. This is encouraging in terms of the potential of the technique for characterizing (in-plane) residual stresses in surface layers, particularly for mapping of point-to-point variations (as opposed to obtaining accurate absolute values). In contrast to this, it is shown that changes in the hardness, as a consequence of changes in residual stress level, are smaller and more difficult to analyse. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据