Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 188, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2020.104214
Keywords
J-integral; C*; Plastic limit load; h(1)-function; Small punch creep; Creep crack growth
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy (MOTIE) [2014 1010101850]
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Small punch (SP) creep test specimen with an elliptical surface crack was suggested for use with creep crack growth testing. Estimation equations for fracture parameters are needed. K-equation was derived previously for the crack in the SP specimen. In this study, estimation equations for J and C* were derived. 3D elastic-plastic finite element analyses were carried out to determine J value along the front of the surface cracks of the same geometries as were employed for the K-estimation. The dimensionless function, h(1) was determined for various crack locations according to the EPRI scheme. The plastic limit load solution was also determined. The C*-equation of the cracked SP specimen was derived based on the J(p) solution using the analogy between the secondary creep constitutive law and the Ramberg-Osgood plasticity law. The C*-equation may be able to be used to characterize the creep crack growth behavior under the extensive creep condition of the cracked SP specimen.
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