Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
권호 표지

The Evaluation of Crack Propagation in Functionally Graded Materials with Coatings

코팅 경사기능 재료의 균열전파에 관한 평가

  • Kwon, Oh-Heon (Division of Safety Engineering, Pukyong National University)
  • 권오헌 (부경대학교 안전공학부)
  • Published : 2008.08.31
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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

References

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