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Failure behavior of SA508 Gr.1a LAS and SA312 TP316 SS pipes with a circumferential through-wall crack under large amplitude cyclic loads

Authors
Kim, J.W.Kweon, H.D.Kim, Y.J.
Issue Date
4월-2021
Publisher
Elsevier Ltd
Keywords
Circumferential through-wall crack; Cyclic fracture test; Failure behaviour; Large-amplitude cyclic loads; Small-scale pipe specimen
Citation
Thin-Walled Structures, v.161
Indexed
SCIE
SCOPUS
Journal Title
Thin-Walled Structures
Volume
161
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128980
DOI
10.1016/j.tws.2021.107524
ISSN
0263-8231
Abstract
This paper presents cyclic fracture test results using small-scale through-wall cracked pipe specimens to investigate the effects of large-amplitude cyclic loads on failure behaviour for different pipe materials. SA508 Gr.1a low-alloy steel (LAS) and SA312 TP316 stainless steel (SS) pipes were used in the experiment. The tests were conducted under quasi-static monotonic, displacement-controlled, and load-controlled cyclic loadings at room temperature (RT). Regardless of the pipe material, displacement-controlled reversed cyclic loading significantly reduced deformation-ability and fracture resistance, promoting crack growth. These effects were more pronounced in the SA312 TP316 SS than in the SA508 Gr.1a LAS specimen. The material-dependence on fracture behaviour was considerable under monotonic load, but was near-negligible under displacement-controlled reversed cyclic loading. Under load-controlled cyclic loading, the number of cycles to failure, the maximum allowable crack extension, and deformation-ability of pipe specimens decreased as the amplitude and compressive level increased. For all load-controlled cyclic loads, the SA312 TP316 SS specimen was less resistant to failure than the SA508 Gr.1a LAS specimen. Regardless of the loading type, a circumferential through-wall crack grew out of the initial crack plane for the SA508 Gr.1a LAS specimen, but propagated in a straight line from the initial crack plane for the SA312 TP316 SS specimen. © 2021 Elsevier Ltd
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공과대학 (기계공학부)
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