Determination Of The Fatigue Behavior Of
Coatings By Means Of An Improved Impact
Testing Evaluation Procedure
Author(s)
C. David, K. G. Anthymidis, P. Agrianidis & D. N. Tsipas
Abstract
Impact testing is an efficient experimental procedure that enables the
determination of the fatigue resistance of mono- and multilayer coatings
deposited on various substrates, which is not possible with the common testing
methods previously available. In this paper an advanced impact tester, capable of
assessing the fatigue failure resistance of coatings working under cyclic loading
conditions, is presented. The fatigue failure of the tested coating was determined
by means of scanning electron and optical microscopy. The test results were
recorded in diagrams containing the impact load versus the number of successive
impacts that the tested coating can withstand.
Keywords: thin films and coatings, materials characterization, fatigue.
1 Introduction
The impact test method has been introduced as a convenient experimental
technique to evaluate the fatigue strength of coatings being exposed in alternate
impact loads [1–4]. According to this method a coated specimen is cyclically
loaded by a hard ball that repetitively impacts on the specimen surface. The
superficially developed Hertzian pressure induces a complex stress filled within
the coating, as well as, in the interfacial zone. Both these stress states are
responsible for distinct failure modes, such as a cohesive or adhesive one. The
Keywords
thin films and coatings, materials characterization, fatigue.
Related Book
Other papers in this volume
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