Experimental Mechanics

, Volume 50, Issue 1, pp 85–97

Mechanical Characterization of Coatings Using Microbeam Bending and Digital Image Correlation Techniques

Article

DOI: 10.1007/s11340-008-9187-4

Cite this article as:
Eberl, C., Gianola, D.S. & Hemker, K.J. Exp Mech (2010) 50: 85. doi:10.1007/s11340-008-9187-4

Abstract

A new technique for characterizing end-supported microbeams of coating materials is presented. Microbeams are fabricated using micro-EDM machining to isolate the material under investigation from the underlying substrate. Three- and four-point bending is realized by a custom-built microspecimen testing system, and digital image correlation is employed to capture full-field strains and displacements in theses microbeams. These experiments provide the foundation for the use of finite element modeling and inverse methods to determine the mechanical properties (elastic moduli, strength, interfacial toughness) of the coatings. Here, the experimental details of the microbeam bending experiments are explained, discussed and illustrated through application to a multilayered metal/oxide/ceramic thermal barrier coating system commonly used in aero-turbines.

Keywords

Digital image correlation Microbeam bending Thermal barrier coatings Aerospace materials Young’s modulus Fracture toughness 

Copyright information

© Society for Experimental Mechanics 2008

Authors and Affiliations

  1. 1.Institut für Zuverlässigkeit von Bauteilen und SystemenUniversität KarlsruheKarlsruheGermany
  2. 2.Institut für Material Forschung IIForschungszentrum KarlsruheKarlsruheGermany
  3. 3.Department of Mechanical EngineeringThe Johns Hopkins UniversityBaltimoreUSA

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