Effect of CT Specimen Thickness on the Mechanical Characteristics at the Crack Tip of Stress Corrosion Cracking in Ni-based Alloys

[摘要] It's important to obtain accurate stress corrosion crack(SCC) growth rate for quantitative life prediction of components in nuclear power plants. However, the engineering practice shows that the crack tip constraint effect has a great influence on the mechanical properties and crack growth rate of SCC at crack tip. To study the influence of the specimen thickness on the crack tip mechanical properties of SCC, the stress, strain and C integral at creep crack tip are analyzed under different specimens thickness. Results show that the cracked specimen is less likely to crack due to effect of crack tip constraint. When the thickness ratio B/W is larger than 0.1, the crack tip constraint is almost ineffective. Value of C integral is the largest when B/W is 0.25. Then specimen thickness has little effect on the value of C integral. The effect of specimen thickness on the value of C integral is less significant at higher thickness ratio.

[发布机构] School of Mechanical Engineering, Xi'An University of Science and Technology, Xi'an; 710054, China^1;School of Science, Xi'An University of Science and Technology, Xi'an; 710054, China^2

[效力级别] 无线电电子学

[关键词] Crack tip constraint;Cracked specimens;Engineering practices;Life predictions;Mechanical characteristics;Ni based alloy;Specimen thickness;Thickness ratio