Measuring Bended Pipe Residual Stresses

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F03%3A02091587" target="_blank" >RIV/68407700:21220/03:02091587 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
čeština
Original language name
Měření zbytkových napetí u trubkových ohybů
Original language description
Residual stresses are induced in the material of structures in almost all manufacturing processes. Presence of residual stresses in construction is undesirable and plenty of finance is spent to remove or reduce it. Pipe bends are produced from rolled weldless pipe by hot forming under temperature between 920-980°C and cooled from this temperature by means of air. Temper annealing is requared by CSN standard 42 0284 in this case, because both ends of pipe were not warm. This operation is very expensive and also has substantially increased production time and following production cost rise. New CSN standard 130021-6-1 alows omit annealing operation in the case of the low level residual stresses in construction. Therefore residaul stresses were measured in pipe bend. Hole drilling method was used for determination of residual stresses. Residual stresses were measured in 14 places on the surface of the pipe bend and in one place on comparing pipe
Czech name
Měření zbytkových napetí u trubkových ohybů
Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2003
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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