Evaluation of Fracture Toughness of Al alloys for Propulsive Engine using Strain Measurement

변형률 측정을 이용한 추진기관용 Al 합금의 파괴인성 평가

  • 김재훈 (충남대학교 기계설계공학과) ;
  • 김덕회 (충남대학교 기계설계공학과) ;
  • 임동규 (충남대학교 기계설계공학과) ;
  • 박성욱 (충남대학교 기계설계공학과) ;
  • 문순일 (국방과학연구소)
  • Published : 2002.09.01


The tincture toughness is evaluated by using U(compact tension) and 3PB(three point bending) specimens of AI alloys far propulsive engine. To evaluate the static fracture toughness, strain gage method is used. The static fracture toughness obtained from the strain measurement is compared with the results by ASTM standard and FEM analysis. For the reliable evaluation of fracture toughness, strain gages are attached at various positions.


fracture toughness;strain measurement;stress intensity factor;gage position


  1. L. Pamas, 0. G. Bilir and E. Tezcan, 'Strain Gage Methods for Measurement of Opening Mode Stress hitensity Factor,' Engineering Fracture Me-chanics, Vol. 55, No. 3, pp. 485-492, 1996 https://doi.org/10.1016/0013-7944(95)00214-6
  2. 임동규, '70계열 알루미늄 합금의 동적파괴인성및 노치 영항,' 충남대학교 대학원 석사학위논문, 2002
  3. J. W. Dally and R. J. Sanford, 'Strain Gage Methods for Measuring the Opening Mode Stress Intensity Factor KI,' Experimental Mechanics, Vol. 27, No. 4, pp. 381-388, 1987 https://doi.org/10.1007/BF02330311
  4. G. R. Irwin, 'Analysis of Stress and Strain Near the End of a Crack Traversing a Plate,' Tran-sactions of ASME, Journal of Applied Mechanics, Vol. 24, No. 3, pp. 361-364, 1957
  5. R. S. Barsom, On the Use of Isoparametric Finite Elements in Linear Fracture Mechanics, Int. J. Numer. Meth. Engng., Vol. 10, pp, 25-37, 1978 https://doi.org/10.1002/nme.1620100103
  6. 임동규, 김덕회, 김재훈, 문순일, '추진기관용연소관 소재의 동적파괴인성 측정,' 한국군사과학기술학회 종합학술대회 논문집, Voi. ll, pp. 491-494, 2001
  7. Shockey, D., KalthofF, J. F., Klemm, W. and Winkler, S., 'SimuItaneous Measurements of Stress Intensity for Fast Running Cracks in Steel,' Experimental Mechanics, Vol. 23, No. 2, pp. 140-145, 1983 https://doi.org/10.1007/BF02320401
  8. ASTM E399-90, 'Standard Test Method for PlaneStrain Fracture Toughness of Metallic Materials,' Metals Test Methods and Analytical Procedures, Vol. 3, pp. 408-438, 1987
  9. 김재훈, 문순일, 이현철, 김덕회, '스트레인게이지법을 이용한 응력확대계수 측정,' 한국추진공학회 논문집, Vol. 4. No. 2, pp. 53-64, 2000
  10. ANSYS User's Manual, Procedures, Revision 5.7, Swanson Analysis System, 2000
  11. Kang, B. S. and Kobayashi, A. S., 'J-Resistance Curves in Al SEN Specimens using Moire Inter-ferometry,' Experimental Mechanics, Vol. 28, No. 2, pp. 154-158, 1988 https://doi.org/10.1007/BF02317566
  12. Shukla, A. Agarwal, R. K. and Nigam, H., 'Dynamic Fracture Studies on 7075-T6 Al and 4340 Steel using Strain Gages and Photoelastic Coatings,' Engineering Fracture Mechanics, Vol. 31, No. 3, pp. 501-515, 1989 https://doi.org/10.1016/0013-7944(88)90092-6