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The Prediction of Fatigue Crack Initiation Life of Cylindrical Notch Specimens Using Local Strain Approximation

국부 변형률 근사를 이용한 원통형 노치시편의 피로균열 발생수명의 예측

  • 임재용 (한국과학기술원 기계공학과) ;
  • 홍성구 (한국과학기술원 기계공학) ;
  • 이순복 (한국과학기술원 기계공학과)
  • Published : 2004.06.01

Abstract

Fatigue crack initiation lives of round cylindrical notch specimen were investigated. Firstly, local strain approximation methods, such as the modified incremental Neuber's rule and the modified incremental Glinka's equivalent strain energy density(ESED) rule, were used to get multiaxial stress and strain state components at the notch tip. Based on the history of local stress and strain, multiaxial fatigue models were used to obtain fatigue crack initiation lives. Because the solution of Neuber's rule and Glinka's ESED rule make the upper and lower bound of local strain approximations, fatigue crack initiation lives are expected to place between life predictions by two local strain approximations. Experimental data were compared with the fatigue crack initiation life prediction results.

Keywords

Fatigue Crack Initiation;Notch;Local Strain Approach;Neuber′s Rule;Glinka′s Equiavalent Strain Energy Density Rule;Replica;Multiaxial Fatigue

References

  1. Socie,D., 'Critical Plane Approaches for Multiaxial Fatigue Damage Assessment,' Advances in Multiaxial Fatigue, ASTM STP 1191, , ASTM , Philadelphia, 1993, pp.7-36
  2. Sang-Log Kwak, Joon-Seong Lee, Young-Jin Kim and Youn-Won Park, 2001, 'Crack Initiation Life Analysis in Notched Pipe Under Cyclic Bending Loads,' KSME Trans. A. vol. 25, No. 10, pp.1528-1534
  3. Tavernelli, J.F. and L.F.Coffin, Jr., 1962, 'Experimental Support for Generalized Equation Predicting Low Cycle Fatigue,' Trans. ASME, J. Basic Eng., Vol.84, No.4, pp.533 https://doi.org/10.1115/1.3658701
  4. Fash, J.W., Socie, D.F. and McDowell, D.L., 1985, 'Fatigue Life Estimates for a Simple Notched Component Under Biaxial Loading,' Multiaxial Fatigue, ASTM STP 853, ASTM, Philadelphia, pp. 497-513
  5. Steven M. Tipton and Drew V. Nelson, 1997, 'Advances in Multiaxial Fatigue Life Prediction for Components with Stress Concentrations,' International Journal of Fatigue, Vol. 19, No.6, pp. 503-515 https://doi.org/10.1016/S0142-1123(96)00070-9
  6. Garud, Y.S., 1981, 'A New Approach to the Evaluation of Fatigue Under Multiaxial Loadings,' Journal of Engineering Materials and Technology, Vol.103, pp. 118-126 https://doi.org/10.1115/1.3224982
  7. Basquin, O.H., 1910, 'The Exponential Law of Endurance Tests,' Proc. ASTM, Vol.10, Part11, ASTM, West Conshohocken, PA, pp.625-630
  8. Knop, M., Jones, R., Molent, L., Wang, C., 2000, 'On the Glinka and Neuber Methods for Calculating notch tip strains under cyclic loading spectra,' International Journal of Fatigue, Vol. 22, pp. 743-755 https://doi.org/10.1016/S0142-1123(00)00061-X
  9. Morrow,J., 1965, 'Cyclic Plastic Strain Energy and Fatigue of Metals,' in Internal Friction, Damping and Cyclic Plasticity, ASTM STP 378, American Society for Testing and Materials, Philadelphia, PA, pp.45-84
  10. Eandil, F.A., Brown, M.W. and Miller, K.J., 1982, Book280, The Metals Socity, London, p.203
  11. Singh, M.N.K., Glinka, G. and Dubey, R.N., 1996, 'Elastic-Plastic Stress-Strain Calculation in Notched Bodies Subjected to Non-Proportional Loading,' International Journal of Fracture, Vol. 76, pp. 39-60 https://doi.org/10.1007/BF00034029
  12. Chu, C.C., 1995, 'Incremental Multiaxial Neuber Correction for Fatigue Analysis,' Paper No.950705, Society of Automotive Engineers, Warrendale, PA
  13. Moftakhar, A., Buczynski A. and Glinka, G., 1995, 'Calculation Elasto-Plastic Strains and Stresses in Notches under Multiaxial Loading,' International Journal of Fracture, Vol. 70, pp.357-373 https://doi.org/10.1007/BF00032453
  14. Hoffman, M. and Seeger, T., 1985, 'A Generalized Method for Estimating Multiaxial Elastic-Plastic Notch Stresses and Strains, Part 1: Theory.' Journal of Engineering Materials and Technology, Vol. 107, pp.250-254 https://doi.org/10.1115/1.3225814
  15. Neuber, H., 1961, 'Theory of Stress Concentration for Shear-Strained Prismatical Bodies with Arbitrary Nonlinear Stress-Strain Law,' Journal of Applied Mechanics, Vol. 26, No.4, pp.544-550
  16. Molski, K. and Glinka, G., 1981, 'A Method of Elastic-Plastic Stress and Strain Calculation at a Notch Root,' Material Science and Engineering, Vol. 50, pp.93-100 https://doi.org/10.1016/0025-5416(81)90089-6
  17. Dowling, N., Brose, W. R. and W.K. Wilson, 1977, 'Notched Member Fatigue Life Predictions by the Local Strain Approach,' Fatigue under Complex Loading Analyses and Experiments, Advances in Engineering, Vol. 6, R.M. Wetzel(ed.), Society of Automotive Engineers, Warrendale, Pa., pp.55-84