Constraint Effects of Clad on Underclad Crack

Author:

Miyazaki N.1,Ikeda T.1,Ochi K.1

Affiliation:

1. Department of Chemical Engineering, Kyushu University, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812, Japan

Abstract

The finite element method is applied to two-dimensional elastic-plastic analyses for underclad crack problems. The analyses are performed for rectangular specimens with an underclad crack, which are composed of A533B class 1 steel and a clad material, to obtain the fracture mechanics parameter J-integral and the stress distribution ahead of a crack tip. The Q-factor proposed by O’Dowd and Shih is calculated from the stress distribution ahead of a crack tip, and the constraint effect of a crack tip due to a clad material or the effect of a clad material on the fracture toughness of a base material is discussed in terms of the Q-factor. Clad thickness, crack length, and the material property of a clad material are varied to examine their effects.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Safety, Risk, Reliability and Quality

Reference16 articles.

1. Bethmont, M., Moinereau, D., and Rousselier, G., 1991, “Cleavage Fracture of Large Specimens Containing Small Underclad Cracks,” Transactions of the 11th International Conference on Structural Mechanics in Reactor Technology, Vol. G, pp. 7–12.

2. Hutchinson J. W. , 1968a, “Singular Behavior at the End of a Tensile Crack in a Hardening Material,” Journal of Mechanics and Physics of Solids, Vol. 16, pp. 13–31.

3. Hutchinson J. W. , 1968b, “Plastic Stress and Strain Fields at a Crack Tip,” Journal of Mechanics and Physics of solids, Vol. 16, pp. 337–348.

4. Keeney-Walker, J., Bass, B. R., and Pennell, W. E., 1991, “Evaluation of the Effects of Irradiated Cladding on the Behavior of Shallow Flaws Subjected to Pressurized-Thermal-Shock Loading,” Transactions of the 11th International Conference on Structural Mechanics in Reactor Technology, Vol. G, pp. 195–200.

5. Keeney, J. A., Theiss, T. J., McAfee, W. J., and Bass, B. R., 1993, “An Overview of the HSST Full-Thickness Shallow-Crack Clad Beam Testing Program,” Transactions of the 12th International Conference on Structural Mechanics in Reactor Technology, Vol. G, pp. 183–188.

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