Development of cleavage fracture toughness locus considering constraint effects |
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Authors: | Email author" target="_blank">Yoon-?Suk?ChangEmail author Young-Jin?Kim Ludwig?Stumpfrock |
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Affiliation: | (1) SAFE Research Centre, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun- dong, Jangan- gu, Suwon, 440-746 Kyonggi- do, Korea;(2) Staatliche Materialprufungsanstalt, Universitat Stuttgart, Pfaffenwaldring 32, D-70569 Stuttgart, Germany |
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Abstract: | In this paper, the higher order terms in the crack tip stress fields are investigated macroscopically for more realistic assessment
of structural material behaviors. For reactor pressure vessel material of A533B ferritic steel, effects of crack size and
temperature have been evaluated using 3-point SENB specimens through a series of finite element analyses, tensile tests and
fracture toughness tests. The T-stress, Q-parameter andq-parameter as well as theK andj-integral are calculated and mutual relationships are investigated also. Based on the evaluation, it has proven that the effect
of crack size from standard length (a/W=0.53) to shallow length(a/W=0.11) is remarkable whilst the effect of temperature from - 20°C to-60°C is negligible. Finally, the cleavage fracture toughness
loci as a function of the promising Q-parameter orq-parameter are developed using specific test results as well as finite element analysis results, which can be applicable for
structural integrity evaluation considering con-straint effects. |
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Keywords: | Constraint Effect Two-parameter Approach Modified Boundary Layer Formulation T-stress Q-parameter q-parameter Biaxiality Ratio Cleavage Fracture Toughness Locus |
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