Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Study on Fatigue Damage Model and Multi-Stress Level Fatigue Life Prediction of Composite Materials (II) -Fatigue Damage Model using Reference Modulus-

복합재료의 피로손상 모형 및 다응력 수위 피로수명 예측 연구 (II) - 참고계수를 이용한 피로 손상 모형 -

  • 이창수 (포항공과대학교 기계공학과) ;
  • 황운봉 (포항공과대학교 기계공학과) ;
  • 한경섭 (포항공과대학교 기계공학과)
  • Published : 1999.04.01
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Abstract

During fatigue loading of composite materials, damage accumulation can be monitored by measuring their material properties. In this study, fatigue modulus is used as the damage index. Fatigue life of composite materials may be predicted analytically using damage models which are based on fatigue modulus and resultant strain. Damage models are propesed as funtions of applied stress level, number of fatigue cycle and fatigue life. The predicted life was comparable to the experimental result obtained using E-glass fiber reinforced epoxy resin materials and pultruded glass fiber reinforce polyester composites under two-stress level fatigue loading.

복합재료가 피로하중을 받으면 재료 내부에 손상이 누적되며, 이는 재료의 물성 변화로 나타난다. 본 연구에서는 손상을 나타내는 인자로 피로계수를 사용하였다. 피로계수와 참고계수로 정의되는 손상함수로부터 복합재료의 피로수명 예측을 이론적으로 연구하였다. 제안된 모델들은 인가 응력 수준, 피로주기 및 피로수명의 함수로 유도하였다. 예측 결과는 유리섬유/에폭시 복합재료와 유리섬유/폴리에스터 복합재료를 사용한 다중응력 피로 실험 데이터를 이용하여 검증하였다.

Keywords

References

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