CTOD-R Curve Tests of API 5L X90 By SENT Specimen Using a Modified Normalization Method

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• 作者：L. Z. Kong ; X. Y. Zhou ; L. Q. Chen ; K. Huang and H. T. Peng
• 刊名：Fatigue & Fracture of Engineering Materials & Structures
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：40
• 期：2
• 页码：288-299
• 全文大小：1421K
• ISSN：1460-2695

文摘

A modified normalization method is presented for obtaining crack tip opening displacement (CTOD) resistance curves of single edge-notched tension specimens. For the applied load mode, the normalization method should be based on force-crack mouth opening displacement. A formula is proposed for C_LL(i), the core parameter used in the normalization calculation. The modified method is validated using the unloading compliance method. The study of specimen geometry shows that side-groove depth and crack depth have significant impacts on the obtained CTOD resistance curves, and the shape of the crack front affects the determination accuracy of crack length.