Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Using the Finite Element Method, 3 Dimensional FE Analysis of Residual Stress by Cold Expansion Method in the Plate Baying Adjacent Holes

인접홀에서 홀확장법 적용시, 유한요소법을 이용한 잔류응력해석

  • 양원호 (성균관대학교 기계공학과) ;
  • 조명래 (인덕대학 컴퓨터응용설계) ;
  • 장재순 (성균관대학교 대학원 기계공학부)
  • Published : 2006.05.01
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Abstract

In the aerospace industry, Cold expansion has been used the most important method that is retarded of crack initiation from fastener hole surface. Cold expansion method(CEM) is that a oversized tapered mandrel goes through the hole in order to develop a compressive residual stress as the passing of the mandrel around the hole. Therefore, because of characteristic of mandrel inserting, Residual Stress Distributions (RSD) are differently generated form Entry, Mid and Exit position of the plate. Also, it is respected that RSD are changed as distances between holes. In this paper, It is performed a FE analysis of RSD by CEM and it is respectively shown RSD in the Entry, Mid and Exit position. It is compared residual stress results form the cold expansion in these two cases: the concurrent CEM and the sequential CEM. From this research, it has been found that compressive residual stress of Entry position is lower than other positions. Also, the concurrent CE of adjacent holes leads to much higher compressive residual stress than the sequential CE. In addition, in the sequential CE case, a compressive RSD of 1 step's hole around is lower than compressive RSD of 2 step's hole around.

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References

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