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Collinear cracks in a layered structure with a thermoelastically graded interfacial zone under thermal shock

열충격하 적층체의 열탄성 구배기능 계면영역을 고려한 동일선상 복수균열 해석

  • 최형집 (계명대학교 기계공학과) ;
  • 진태은 (한국전력기술(주) 전력기술개발연구소) ;
  • 이강용 (연세대학교 기계공학과)
  • Published : 1998.04.01

Abstract

In this paper, the thermal shock responses of collinear cracks in a layered medium are investigated based on the uncoupled, quasi-static plane thermoelasticity. The medium is modeled as a bonded structure composed of a surface layer and a semi-infinite substrate. Between these two dissimilar homogeneous constituents, a functionally graded interfacial zone exists with the nonhomogeneous features of continuously varying thermoelastic properties. Three cracks are assumed to be present in the layered medium, one in each one of the constituent materials, aligned collinearly normal to the nominal interfaces. A system of singular integral equations is solved, subjected to the forcing terms of equivalent transient thermal tractions acting on the locations of cracks via superposition. Main results presented are the transient thermal stress intensity factors to illustrate the parametric effects of various geometric and amterial combinations of the medium with the thermoelastically graded interfacial zone and the collinear cracks.

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