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Title: Finite element simulation and experimental determination of interfacial adhesion properties by wedge indentation
Authors: Chen, L. 
Yeap, K.B.
Zeng, K.Y. 
Liu, G.R. 
Keywords: Adhesion
Cohesive zone model
Computer simulation
Finite-element modeling
Wedge indentation
Issue Date: Jun-2009
Citation: Chen, L., Yeap, K.B., Zeng, K.Y., Liu, G.R. (2009-06). Finite element simulation and experimental determination of interfacial adhesion properties by wedge indentation. Philosophical Magazine 89 (17) : 1395-1413. ScholarBank@NUS Repository.
Abstract: This paper presents our recent study on determination of interfacial adhesion properties of soft-film-on-hard-substrate (SFHS) systems using finite element simulation (FEM) and wedge indentation experiments. The objectives of this study are: (i) to simulate the interfacial delamination processes during wedge indentation experiments; (ii) to study the effects of interfacial delamination on the characteristics of the indentation load-displacement (P-h) curves, (iii) to determine the interfacial adhesion properties; and (iv) to compare the simulation and experimental results. During the FEM simulation, a traction-separation law is used to describe the interfacial adhesion properties due to the large-scale yielding during indentations. The effects of main parameters in the traction-separation law, i.e. interfacial strength and interfacial energy, to the initiation of interfacial delamination are studied by parametric studies. An interface energy-strength contour, which can be used to determine the interfacial adhesion properties of the thin-film/substrate systems based on a wedge indentation experiment, is developed from the outcomes of the FEM simulation of the indentations using wedge tips with the inclusion angles of 90° and 120°. Using the respective interface energy-strength contours, the interfacial energy and strength of a BlackDiamond® (BD)/Si system and a methylsilsesquioxane (MSQ)/Si system are determined. The simulated results are then compared with the previous experimentally derived interfacial fracture toughness values and some further discussions are given. © 2009 Taylor & Francis.
Source Title: Philosophical Magazine
ISSN: 14786435
DOI: 10.1080/14786430902973858
Appears in Collections:Staff Publications

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