Analysis of spherical indentation of porous ceramic films. Issue 3 (March 2017)

• Record Type: Journal Article
• Authors: Chen, Zhangwei; Wang, Xin; Brandon, Nigel; Atkinson, Alan
• Is Part Of: Journal of the European Ceramic Society. Volume 37:Issue 3(2017)
• Page Start: 1031
• Page End: 1038
• Publication Date: 2017-03
• Subjects: Porous ceramic film -- Indentation -- Finite element modelling -- Deformation -- Mechanical properties; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2016.10.002
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Spherical indentation of a porous brittle La0.6 Sr0.4 Co0.2 Fe0.8 O3 ceramic film (porosity = 39.7%) on a stiffer elastic Ce0.9 Gd0.1 O1.95 substrate is simulated by finite element modelling incorporating the Gurson model to account for densification. The simulated load-displacement curves, apparent elastic modulus E, indentation hardness H and densification profile are all in good agreement with experimental data for the film. The simulations show that E and H are not sensitive to film residual stress. However E is very sensitive to the indent depth-film thickness ratio f, although H is less so for f < 0.3. The simulated dependence of E and H on f are highly consistent with experimental data, supporting the extrapolation of E and H measured for 0.1 < f < 0.3, to zero depth for good estimates of the film-alone properties. The inclusion of densification in the simulation makes only a small difference to E, but has a large influence on H as a function of indentation depth.