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Role of interface curvature on stress distribution under indentation for ZrN/Zr multilayer coating

Verma, Nisha and Jayaram, Vikram (2014) Role of interface curvature on stress distribution under indentation for ZrN/Zr multilayer coating. In: THIN SOLID FILMS, 571 (2). pp. 283-289.

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Official URL: http://dx.doi.org/ 10.1016/j.tsf.2014.06.001


Contact damage in curved interface nano-layeredmetal/nitride (150 (ZrN)/10 (Zr) nm) multilayer is investigated in order to understand the role of interface morphology on contact damage under indentation. A finite element method (FEM) model was formulated with different wavelengths of 1000 nm, 500 nm, 250 nm and common height of 50 nm, which gives insight on the effect of different curvature on stress field generated under indentation. Elastic-plastic properties were assigned to the metal layer and substrate while the nitride layer was assigned perfectly elastic properties. Curved interface multilayers show delamination along the metal/nitride interface and vertical cracks emanating from the ends of the delamination. FEM revealed the presence of tensile stress normal to the interface even under the contact, along with tensile radial stresses, both present at the valley part of the curve, which leads to vertical cracks associated with interfacial delamination. Stress enhancement was seen to be relatively insensitive to curvature. (C) 2014 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 18 Jan 2015 06:33
Last Modified: 18 Jan 2015 06:33
URI: http://eprints.iisc.ac.in/id/eprint/50688

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