Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
권호 표지

Fatigue Life Prediction of Fiber-Reinforced Composite Materials having Nonlinear Stress/Strain Behavior

비선형 변형 거동을 갖는 섬유강화 복합재료의 피로수명 예측

  • 이창수 (포항공과대학교 기계공학과) ;
  • 황운봉 (포항공과대학교 기계공학과)
  • Published : 1999.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

Fatigue life prediction of matrix dominated composite laminates, which have a nonlinear stress/strain response, was studied analytically and experimentally. A stress function describing the relation of initial fatigue modulus and elastic modulus was used in order to consider the material nonlinearty. New modified fatigue life prediction equation was suggested based on the fatigue modulus and reference modulus concept as a function of applied stress. The prediction was verified by torsional fatigue test using crossply carbon/epoxy laminate tubes. It was shown that the proposed equation has wide applicability and good agreement with experimental data.

비선형 하중/변위 거동을 나타내는 모재 지배 복합재료의 피로수명 예측을 이론과 실험에 의해 연구하였다. 재료의 비선형성을 고려하기 위해 초기 피로계수와 탄성계수의 관계를 나타내는 응력함수를 도입하였다. 피로계수와 참고계수 개념을 기반으로 하여 새로운 피로수명 예측식이 가한 하중 수위의 함수로 유도되었다. 예측 결과는 직교이방성 탄소섬유/에폭시 적층판을 사용한 원통형 시편의 비틀림 피로 실험과 비교되었으며, 제안된 식은 실험치와 잘 일치하였다.

Keywords

References

  1. Composite Structures v.17 The Fatigue Behavior of Composite Laminates under Various Mean Stresses Rotem, A.
  2. Composite Materials: Testing and Design (Second Conference), ASTM STP 497 A New Theory to Predict Cumulative Fatigue Damage in Fiberglass Reinforced Plastics Broutman, L. J;Sahu, S.
  3. J. of Composite Materials v.10 Fatigue Behavior of Composite Laminate Hahn, H. T.;Kim, R. Y.
  4. Composite Materials: Testing and Design (Sixth Conference), ASTM STP 787 Failure Characterization of a Graphite/Epoxy Laminated Through Proof Testing Hahn, H. T.;Hwang, D. G;I, M. Daniel(ed.)
  5. J. of Composite Materials v.11 Residual Strength Degradation Model and Theory of Periodic Proof Tests for Graphite/Epoxy Laminates Yang, J. N.;Liu, M. D,
  6. J. of Composite Materials v.12 Residual Strength in Fatigue Based on the Strength-Life Equal Rank Assumption Chou, P. C.;Croman, R.
  7. Composite Materials: Testing and Design (Fifth Conference), ASTM STP 674 Degradation and Sudden-Death Models of Fatigue of Graphite/Epoxy Composite Chou, P.C.;Croman, R.;S. W. Tasi(Ed.)
  8. Composite Materials: Fatigue and Fracture, ASTM STP 907 Damage Mechanisms and Accumulation in Graphite/Epoxy Laminates Charewicz, A.;Daniel, I.M.;H.T. Hahn(Ed.)
  9. J. of Composite Materials v.15 Fatigue Damage Evaluation through Stiffness Measurements in Boron-Epoxy Laminates O' Brien, T.K.;Reifsnider, K.L.
  10. J. of Composite Materials v.17 Fatigue Damage and Degradation in Random Short-Fiber SMC Composites Wang, S.S.;Chin E.S.M.
  11. Composite Materials: Fatigue and Fracture, ASTM STP 907 A Critical-Element Model of the Residual Strength and Life of Fatigue-Loaded Composite Coupons Reifsnider, K.L.;Stinchcomb, W.W.;H. T. Hahn(Ed.)
  12. Composites Science and Technology v.36 On Fatigue Damage Accumulation and Material Degradation in Composite Materials Ye, L.
  13. J. of Composite Materials v.24 A Stiffness Degradation Model for Graphite/Epoxy Laminates Yang, J.N.;Jones, D.L.;Yang, S.H.;Meskini, A.
  14. J. of Composite Materials v.20 Fatigue of Composites - Fatigue Modulus Concept and Life Prediction Hwang, W.;Han, K.S.
  15. Composite Materials: Fatigue and Fracture (Second Volume), ASTM STP 1012 Fatigue of Composite Materials - Damage Model and Life Prediction Hwang, W.;Han, K. S.;Paul A. Lagace(Ed.)
  16. Int. J. Fatigue v.11 no.6 Tension Fatigue Analysis and Life Prediction for Composite Laminates O' Brien, T. K.;Rigamonti, M.;Zanotti, C.
  17. Composite Materials: Fatigue and Fracture (Second Volume), ASTM STP 1012 Fatigue Life Prediction of Cross-Ply Composite Laminates Lee, J.W.;Daniel, I.M.;Yaniv, G.;Paul A. Lagace(Ed.)
  18. J. of Advanced Materials v.26 Single- and Multi-Stress Level Fatigue Life Prediction of Glass/Epoxy Composites Hwang, W.;Lee, C. S.;Park, H. C.;Han, K. S.
  19. Mechanics of Composite Materials v.34 Static Strength and Failure Mechanism of CFRP under Biaxial Loadings Lee, C. S.;Hwang, W.;Park, H. C.;Han, K. S.
  20. SAS user's guide: statics(Version 6 ed.) Cary, N. C.