ISSN: 0090-3973
Published Online: 30 August 2006
Page Count: 11

Stress Intensity Formulas for Three-dimensional Cracks in the Vicinity of an Interface

Noda, N-A
Kyushu Institute,

Liang, B
Henan University,

(Received 13 April 2006; accepted 22 June 2006)

Abstract

In this study, stress intensity formulas are considered in terms of the square root of area parameter to evaluate arbitrary shaped defects or cracks in the vicinity of an interface. Here “area” is the projected area of the defect or crack. Stress intensity factors for an elliptical crack parallel to a bimaterial interface are considered with varying the distance, aspect ratio of the crack, and combinations of material's elastic constants. Also, stress intensity factors of an interface crack and a crack in a functionally graded material are investigated. Then, it is found that the maximum stress intensity factors normalized by the square root of area are always insensitive to the crack aspect ratio. They are given in a form of formulas useful for engineering applications.

Keywords:
fracture mechanics, stress intensity factor, bimaterial interface, crack

Paper ID: JTE100588
DOI: 10.1520/JTE100588
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