전산구조공학 (Computational Structural Engineering)

한국전산구조공학회 (Computational Structural Engineering Institute of Korea)
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단일방향 복합재료의 공유면에 존재하는 계면 모서리균열의 점탄성 해석

Viscoelastic Analysis of Stress Intensity Factor for Interface Edge Crack in a Unidirectional Liminate

  • 이상순 (한국원자력연구소 원자로기계분야) ;
  • 김범식 (한국원자력연구소 원자로 기계분야)
  • 발행 : 1997.03.01
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초록

탄성 섬유와 점탄성 기지로 구성된 2차원의 단일방향 복합재료에서 발생하는 계면 응력 특이성을 시간영역 경계요소법을 사용하여 조사하였다. 먼저, 아무런 균열없이 섬유와 기지가 완전하게 결합되어 있는 단일방향 복합재료에 횡방향 인장변형이 작용할때 자유경계면 부근에 나타나는 계면 특이응력들을 조사하였다. 그러한 응력들은 섬유와 기지의 결합분리나 계면 모서리 균열을 야기 시킬수 있다. 다음에, 여러가지 크기의 모서리 균열들에 대한 응력확대계수가 계산되었다.

Interfacial stress singularity in a unidirectional two-dimensional laminate model consisting of an elastic fiber and a viscoelastic matrix has been investigated using the time-domain boundary element method. First, the interfacial singular stresses between the fiber and the matrix of a unidirectional laminate subjected to a uniform transverse tensile strain have been investigated near the free surface, but without any defect or any edge crack. Such a stress singularity might lead to fiber-matrix debonding or interfacial edge cracks. Then, the overall stress intensity factor for the case of a small interfacial edge crack of length a has been computed.

키워드

참고문헌

  1. Some Basic Problems of the Mathematical Theory of Elasticity Muskhelishvili, N.I.
  2. Journal of Composite Materials v.1 Transfer normal loading of a unidirectional composite Adams, D.F.;Doner, D.R.
  3. Journal of Composite Materials v.4 Inelastic analysis of a unidirectional composite subjected to transverse normal loading Admans, D.F.
  4. Computers & Structures v.41 Elasto-plastic analysis of an aluminum alloy matrix reinforced with silicon carbride fibers packed in a hexagonal array Gotsis, P.K.;Shabaik, A.H.;Sines, G.H.
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  6. Engineering Fracture Mechanics v.55 Boundary element evaluation of stress intensity factors for interface edge cracks in a unidirectional composite Lee, S.S.
  7. ASME Journal of Applied Mechanics Stress singularity of a unidirectional viscoelastic laminate model Lee, S.S.
  8. International Journal for Numerical Methods in Engineering v.38 Application of high-order quadrature rules to time-domain boundary element analysis of viscoelasticity Lee, S.S.;Westmann, R.A.
  9. Engineering Fracture Mechanics v.51 Time-domain boundary element analysis of cracked linear viscoelastic solids Lee, S.S.;Kim, Y.J.
  10. Boundary Element Technology ⅩI Boundary element analysis of stress intensity factor for interface crack in elastic and viscoelastic bimaterials Lee, S.S.;Kim, J.G.;Hwang, J.K.;Ertekin, R.C.(et al.)(eds)
  11. ASME Journal of Applied Mechanics v.46 Residual thermal stresses due to cool-down of epoxy-resin composite Weitsman, Y.