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Analysis of Indentation-Derived Yield Strength in Metallic Multilayers

[+] Author Affiliations
X. H. Tan, Y.-L. Shen

University of New Mexico

Paper No. IMECE2004-61393, pp. 117-122; 6 pages
doi:10.1115/IMECE2004-61393
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Materials
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Materials Division
  • ISBN: 0-7918-4712-8 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

The determination of overall mechanical properties of small-scale structures, such as nanolayered materials, frequently relies on the nanoindentation technique. In this study finite element modeling is employed to examine the relationship between indentation hardness and overall strength of multilayered composites. For simplicity the laminated structure is taken to consist of alternating layers of two elastic-perfectly plastic materials. The overall yield strength under uniform far-field loading is first quantified. Indentation loading of the layered structure is then simulated to cover a wide range of indentation depth from within one layer thickness to well into multiple layers. The systematic hardness values thus obtained are converted to corresponding flow stresses. It is found that the indentation-derived strength consistently underestimates the composite yield strength. Friction at the contact surface is also found to play a significant role. Relevant issues on applying indentation techniques to probe overall mechanical properties of metallic multilayered are discussed.

Copyright © 2004 by ASME
Topics: Yield strength

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