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Spherical Indentation of Nickel Thin Film on Steel-4340 Substrate

[+] Author Affiliations
Raghu V. Prakash

Indian Institute of Technology Madras, Chennai, TN, India

S. Arunkumar, Ajith Ramesh

Amrita University, Coimbatore, TN, India

Paper No. IMECE2011-64664, pp. 745-750; 6 pages
doi:10.1115/IMECE2011-64664
From:
  • ASME 2011 International Mechanical Engineering Congress and Exposition
  • Volume 3: Design and Manufacturing
  • Denver, Colorado, USA, November 11–17, 2011
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5489-1
  • Copyright © 2011 by ASME

abstract

In this paper, finite element simulations of spherical indentation of Nickel thin film on Steel-4340 are studied for single and multiple cycle of indentation as well. The objective was to understand the mechanics of coated systems, from load-displacement (P-h) curves, stress distribution in the film and the effect of substrate yield strength on the indentation response. The loading portion of P-h curve showed displacement bursts and the reason for this is investigated. A transition in the deformation behavior of the film from Hertz-type to flexure was observed for a normalized indentation depth of h/tf ≈0.2. The influence of coating–substrate properties on P-h curve is also investigated for different h/tf ratios and yield strains. Attempts are also made to explore the possibility of understanding the creep-fatigue behavior of coated specimen subjected to cyclic indentation at room temperature from Indentation depth v/s time, Indentation depth v/s number of cycles and Plastic dissipation energy v/s number of cycles curve.

Copyright © 2011 by ASME
Topics: Thin films , Nickel , Steel

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