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The Evaluation of Crack Propagation in Functionally Graded Materials with Coatings  

Kwon, Oh-Heon (Division of Safety Engineering, Pukyong National University)
Publication Information
Journal of the Korean Society of Safety / v.23, no.4, 2008 , pp. 25-29 More about this Journal
Abstract
Recently, new functionally graded material(FGM) that has a spatial variation in composition and properties is developed because of its good quality. This material yields the demands for resistance to corrosion and high temperature in turbine blade, wear resistance as in gears and high strength machine parts. Especially coating treatment in FGM surface brings forth a mechanical weak at the interface due to discontinuous stress resulting from a steep material change. It often, leads cracks or spallation in a coating area around an interface. The behavior of propagation cracks in FGMs was here investigated. The interface stresses were reduced because of graded material properties. Also graded material parameter with exponential equation was founded to influence the stress intensity factor. And the resistance curve with FGM coating was slightly increased.
Keywords
functionally graded materials(FGMs); propagating crack; stress field; stress intensity factor; graded coatings; graded material parameter; mixture rule;
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