Analysis of the Residual Stress Produced by non-metallic Inclusions during Rail Manufacturing Process

레일의 제조공정에서 비금속 개재물에 의한 레일의 잔류응력 해석

  • 구병춘 (한국철도기술연구원 수송차량연구본부) ;
  • 정우현 (강원산업주식회사 기술) ;
  • 이희성 (한국철도기술연구원 수송차량연구본) ;
  • 서정원 (한국철도기술연구원 수송차량연구본부)
  • Published : 1999.05.01

Abstract

During the cooling process of rail, residual stresses are produced due to the difference of the coefficients of thermal expansion between rail and inhomogeneous non-metallic inclusions such as sulphides and oxides. A micro-mechanical approach is used to obtain the stresses in the inclusions and matrix, After obtaining the stress of an elliptical inhomogeneous inclusion in an infinite domain, average stresses of randomly distributed spherical inclusions are obtained by use of Mori-Tanaka's self consistent method. The magnitude of the calculated residual stress is near to the yield stress of the matrix in case of the spherical inclusions.

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