Effect of Crack Tip Constraint on the Fracture Resistance Curve in CT Specimen with Same Thickness

동일두께의 CT 시편에서 구속효과가 파괴저항곡선에 미치는 영향

  • 조연제 (성균관대학원 기계공학과) ;
  • 장윤석 (성균관대학원 기계공학과) ;
  • 석창성 (성균관대학교 기계공학과) ;
  • 김영진 (성균관대학교 기계설계학과)
  • Published : 1996.02.01


Fracture resistance(J-R) curves, which are used for elastic-plastic fracture mechanics analyses, are known to be dependent on the specimen geometry. The objective of this paper is to investigate the effect of crack tip constraint an the J-R curves in CT specimens. Fracture toughness tests on CT specimens with varying planform size were performed and test results showed that the J-R curves were increased with an increase in the planform size. Finite element analysis were also performed and the numerical results showed that this experimental phenomenon was probably due to the relaxation of crack tip constraint resulting from the stress triaxiality.


Leak Before Break;Constraint Effect;Stress Triaxiality Ration;Fracture Toughness;Finite Element Method


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