Computational Structural Engineering (전산구조공학)

Computational Structural Engineering Institute of Korea (한국전산구조공학회)
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Boundary Element Analysis of Singular Residual Thermal Stresses in A Fiber-Reinforced Unifirectional Viscoelastic Laminate

섬유가 보강된 단일방향 점탄성 복합재료에 발생하는 특이 잔류 열응력의 경계요소해석

  • 이상순 (한국원자력연구소 원자로기계분야) ;
  • 박준수 (한국원자력연구소 계통기계분야)
  • Published : 1996.12.01
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Abstract

This paper concerns the singular thermal stresses at the interface corner between the elastic fiber and the viscoelastic matrix of a two-dimensional unidirectional laminate model induced during cooling from cure temperature down to room temperature. Time-domain boundary element method is employed to investigate the nature of residual thermal stresses at the interface. Numerical results show that very large stress gradients are present at the interface corner and such stress singularity might lead to local yielding or fiber-matrix debonding.

이 논문에서는, 탄성 섬유와 점탄성 기지로 구성된 2차원의 단일방향 복합재료가 높은 제작온도로 부터 실온으로 냉각될때 섬유와 기지사이의 계면에서 발생하는 특이 열응력을 조사하고 있다. 계면을 따라 발생하는 잔류 열응력의 특성을 조사하는데 시간영역 경계요소법을 적용하였다. 수치해석 결과에 의하면, 계면응력들은 자유경계면 근처에 이르러 급속히 커지는데, 이러한 특이 잔류응력들은 자유경계면 가까이에서 국부 항복을 일으키거나 섬유와 기지의 결합분리를 야기시킬수 있다.

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References

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