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Original title:
Reliability Problems in Methods of Residual Creep Life Assessment
Authors: Kloc, Luboš ; Sklenička, Václav
Document type: Papers
Conference/Event: Joint International Conference on Creep and Fracture of Engineering Materials and Structures /10./, Praha (CZ), 2001-04-08 / 2001-04-11
Year: 2001
Language: eng
Abstract: 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.
Keywords: creep life; extrapolation; reliability
Project no.: CEZ:AV0Z2041904 (CEP), IAA2041101 (CEP)
Funding provider: GA AV ČR
Host item entry: Proceedings of the 10th Joint International Conference on Creep and Fracture of Engineering Materials and Structures, ISSN 1213-3787
Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0074519
Permalink: http://www.nusl.cz/ntk/nusl-26441
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Authors: Kloc, Luboš ; Sklenička, Václav
Document type: Papers
Conference/Event: Joint International Conference on Creep and Fracture of Engineering Materials and Structures /10./, Praha (CZ), 2001-04-08 / 2001-04-11
Year: 2001
Language: eng
Abstract: 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.
Keywords: creep life; extrapolation; reliability
Project no.: CEZ:AV0Z2041904 (CEP), IAA2041101 (CEP)
Funding provider: GA AV ČR
Host item entry: Proceedings of the 10th Joint International Conference on Creep and Fracture of Engineering Materials and Structures, ISSN 1213-3787
Institution: Institute of Physics of Materials AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: http://hdl.handle.net/11104/0074519
Permalink: http://www.nusl.cz/ntk/nusl-26441
The record appears in these collections:
Research > Institutes ASCR > Institute of Physics of Materials
Conference materials > Papers
Record created 2011-07-01, last modified 2021-11-24