Analysis of 316H creep crack initiation data at 550 °C using a crack tip constraint parameter. (1st May 2021)

• Record Type: Journal Article
• Authors: Lee, Seung-Ho; Jung, Hyun-Woo; Kim, Yun-Jae; Nikbin, Kamran; Ainsworth, Robert A.
• Is Part Of: Engineering fracture mechanics. Volume 248(2021)
• Publication Date: 2021-05-01
• Subjects: Creep crack tip constraint parameter -- Creep crack initiation time -- 316H creep crack growth data at 550 °C; ASTM American Society for Testing and Materials -- CCI creep crack initiation -- C(T) compact tension -- EPRI Electric Power Research Institute -- FE finite element -- HRR Hutchinson-Rice-Rosengren -- NSW Nikbin-Smith-Webster -- RR Riedel and Rice -- SEN(B) single edge notched bend -- SSY small-scale-yielding; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.107746
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Analyze the effect of constraint of 316H creep crack initiation data at 550 °C. Propose a constraint parameter not requiring detailed inelastic finite element analysis. Suggest a constraint-corrected form of a model due to Nikbin, Smith and Webster. Enhanced creep crack initiation predictions using a constraint-corrected form. Abstract: In this paper, 316H creep crack growth data at 550 °C are analysed to investigate the effect of in-plane constraint on creep crack initiation times. A constraint parameter is proposed to quantify the difference between an actual opening stress and the Riedel-Rice opening stress field in plane strain, using experimentally measured C* . Test data analysis shows that creep crack initiation times can be well characterized by the C* integral with the proposed parameter. A modified form of a model due to Nikbin, Smith and Webster is suggested, and scatter in predictions is shown to be reduced from ~40 to ~5.