کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1447350 988642 2011 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Use of nanoindentation to measure residual stresses in surface layers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Use of nanoindentation to measure residual stresses in surface layers
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 59, Issue 7, April 2011, Pages 2749–2761
نویسندگان
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