Response of sharp-notched circular tubes under bending creep and relaxation
In this paper, the response of sharp-notched circular tubes with notch depths of 0.2, 0.4, 0.6, 0.8 and 1.0 mm subjected to bending creep and relaxation are investigated. The bending creep or relaxation is to bend the tube to a desired moment or curvature and hold that moment or curvature constant f...
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The Japan Society of Mechanical Engineers
2014
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oai:doaj.org-article:0dba77d3c92741dc985e04f331aea8992021-11-26T06:04:01ZResponse of sharp-notched circular tubes under bending creep and relaxation2187-974510.1299/mej.2014smm0005https://doaj.org/article/0dba77d3c92741dc985e04f331aea8992014-04-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/2/1_2014smm0005/_pdf/-char/enhttps://doaj.org/toc/2187-9745In this paper, the response of sharp-notched circular tubes with notch depths of 0.2, 0.4, 0.6, 0.8 and 1.0 mm subjected to bending creep and relaxation are investigated. The bending creep or relaxation is to bend the tube to a desired moment or curvature and hold that moment or curvature constant for a period of time. From the experimental result of bending creep, the creep curvature and ovalization increase with time. In addition, higher held moment leads to the higher creep curvature and ovalization of the tube's cross-section. From the experimental result for bending relaxation, the bending moment rapidly decreases with time and becomes a steady value. As for the ovalization, the amount increases a little with time and gradually becomes a steady value. Due to the constant ovalization caused by the constant curvature under bending relaxation, the tube does not buckle. Finally, the formulation proposed by Lee and Pan (2002) is modified for simulating both the creep curvature–time relationship in the first stage under bending creep and the relaxation moment-time relationship under bending relaxation for sharp-notched circular tubes with different notch depths. Through comparing with the experimental finding, the theoretical analysis can reasonably describe the experimental result.Kuo-long LEEChien-min HSUWen-fung PANThe Japan Society of Mechanical Engineersarticlesharp-notched circular tubesbending creepcreep curvaturecreep ovalizationbending relaxationrelaxation momentrelaxation ovalizationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 2, Pp SMM0005-SMM0005 (2014) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
sharp-notched circular tubes bending creep creep curvature creep ovalization bending relaxation relaxation moment relaxation ovalization Mechanical engineering and machinery TJ1-1570 |
| spellingShingle |
sharp-notched circular tubes bending creep creep curvature creep ovalization bending relaxation relaxation moment relaxation ovalization Mechanical engineering and machinery TJ1-1570 Kuo-long LEE Chien-min HSU Wen-fung PAN Response of sharp-notched circular tubes under bending creep and relaxation |
| description |
In this paper, the response of sharp-notched circular tubes with notch depths of 0.2, 0.4, 0.6, 0.8 and 1.0 mm subjected to bending creep and relaxation are investigated. The bending creep or relaxation is to bend the tube to a desired moment or curvature and hold that moment or curvature constant for a period of time. From the experimental result of bending creep, the creep curvature and ovalization increase with time. In addition, higher held moment leads to the higher creep curvature and ovalization of the tube's cross-section. From the experimental result for bending relaxation, the bending moment rapidly decreases with time and becomes a steady value. As for the ovalization, the amount increases a little with time and gradually becomes a steady value. Due to the constant ovalization caused by the constant curvature under bending relaxation, the tube does not buckle. Finally, the formulation proposed by Lee and Pan (2002) is modified for simulating both the creep curvature–time relationship in the first stage under bending creep and the relaxation moment-time relationship under bending relaxation for sharp-notched circular tubes with different notch depths. Through comparing with the experimental finding, the theoretical analysis can reasonably describe the experimental result. |
| format |
article |
| author |
Kuo-long LEE Chien-min HSU Wen-fung PAN |
| author_facet |
Kuo-long LEE Chien-min HSU Wen-fung PAN |
| author_sort |
Kuo-long LEE |
| title |
Response of sharp-notched circular tubes under bending creep and relaxation |
| title_short |
Response of sharp-notched circular tubes under bending creep and relaxation |
| title_full |
Response of sharp-notched circular tubes under bending creep and relaxation |
| title_fullStr |
Response of sharp-notched circular tubes under bending creep and relaxation |
| title_full_unstemmed |
Response of sharp-notched circular tubes under bending creep and relaxation |
| title_sort |
response of sharp-notched circular tubes under bending creep and relaxation |
| publisher |
The Japan Society of Mechanical Engineers |
| publishDate |
2014 |
| url |
https://doaj.org/article/0dba77d3c92741dc985e04f331aea899 |
| work_keys_str_mv |
AT kuolonglee responseofsharpnotchedcirculartubesunderbendingcreepandrelaxation AT chienminhsu responseofsharpnotchedcirculartubesunderbendingcreepandrelaxation AT wenfungpan responseofsharpnotchedcirculartubesunderbendingcreepandrelaxation |
| _version_ |
1718409761257422848 |