Comments on CTOA transferability in “Crack tip opening angle during unstable ductile crack propagation of a high-pressure gas pipeline” [204 (2018) 434–453]

•This discussion shows that CTOA is closely similar in small-scale and large-scale tests, supporting the transferability of CTOA from DWTT-type specimens to pipe.•The results support the transferability of CTOA at crack velocity of 10 m/s to 200 m/s. When axial fast ductile fracture occurs in high-p...

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Bibliographic Details
Published inEngineering fracture mechanics Vol. 214; pp. 335 - 338
Main Authors Xu, S., Bassindale, C., Williams, B.W., Wang, X., Tyson, W.R., Shibanuma, K.
Format Journal Article
LanguageEnglish
Published New York Elsevier Ltd 01.06.2019
Elsevier BV
Subjects
Chairs
Crack propagation
Crack tips
Ductile fracture
Gas pipelines
Gas pipes
Natural gas
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Summary:•This discussion shows that CTOA is closely similar in small-scale and large-scale tests, supporting the transferability of CTOA from DWTT-type specimens to pipe.•The results support the transferability of CTOA at crack velocity of 10 m/s to 200 m/s. When axial fast ductile fracture occurs in high-pressure gas pipes, the plane of the crack opening does not necessarily remain parallel to the pipe axis. There is in general a tilt angle between the opening flanks and the pipe axis. The present discussion shows that taking into account the presence of a tilt angle results in larger estimates of surface CTOA than those reported in a recent paper (Shibanuma et al., 2018). Considering the effect of tilt angle, the data reported in Shibanuma et al. (2018) support the transferability of CTOA from DWTT-type specimens to full-scale pipe.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2019.03.023