Název: Reliability Problems in Methods of Residual Creep Life Assessment
Autoři: Kloc, Luboš ; Sklenička, Václav
Typ dokumentu: Příspěvky z konference
Konference/Akce: Joint International Conference on Creep and Fracture of Engineering Materials and Structures /10./, Praha (CZ), 2001-04-08 / 2001-04-11
Rok: 2001
Jazyk: eng
Abstrakt: The service life of components designed to operate for long periods under loading at elevated temperatures is limited by the creep deformation and fracture phenomena. Possibility of a reliable prediction of the residual creep life is of major practical and economical relevance. A number of approaches has been used for the estimation of the creep damage and residual life; these approaches could be divided into two principal branches. The microscopic methods are based on the microstructural observations of accumulated damage in the samples of material after service, while macroscopic meth- ods use mechanical testing of the samples under some reference conditions. However, both approaches still do not provide enough reliable results for wide practical use, be- cause of result scatter and missing generally applicable models for the creep damage evolution. The most important factors which make the results unreliable are analyzed in the present paper. These are mainly: i) production scatter in the material's properties, ii) inhomogeneity of the material, iii) sampling problem in microscopic methods, iv) extrapolations involved in macroscopic methods. Some suggestions to overcome these problems are made and the need for a new approach and new experimental techniques is presented.
Klíčová slova: creep life; extrapolation; reliability
Číslo projektu: CEZ:AV0Z2041904 (CEP), IAA2041101 (CEP)
Poskytovatel projektu: GA AV ČR
Zdrojový dokument: Proceedings of the 10th Joint International Conference on Creep and Fracture of Engineering Materials and Structures, ISSN 1213-3787

Instituce: Ústav fyziky materiálů AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0074519

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-26441


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav fyziky materiálů
Konferenční materiály > Příspěvky z konference