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Examination of observed and predicted measures of creep cavitation damage accumulation

Abstract

Brittle intergranular cavitation represents a primary degradation mechanism for high temperature plant operating within the creep range. Fundamental to formulating estimates of remanent life, or consumed life fraction for such components are: the observation and quantification of the level of actual creep cavitation, typically using an A-parameter type approach, and the correlation of observed creep damage accumulation with some phenomenological model which characterizes the rate of damage evolution and, thereby, rupture lifetime. The work described here treats inhomogeneous damage accumulation - in otherwise uniform material and loading situations. Extensions to the A-parameter are considered as a practical measure of damage localization and an extension of the Kachanov-Rabotnov continuum damage mechanics model is proposed to allow theoretical treatment. (orig.) 4 refs.
Authors:
Brear, J M; Church, J M; [1]  Eggeler, G [2] 
  1. ERA Technology Ltd., Leatherhead (United Kingdom)
  2. University of Bochum-Ruhr (Germany)
Publication Date:
Dec 31, 1998
Product Type:
Conference
Report Number:
VTT-SYMP-185(v.2); CONF-980999-
Reference Number:
SCA: 200104; 360103; PA: FI-99:003083; EDB-99:034960; SN: 99002064697
Resource Relation:
Conference: 4. Baltica seminar on plant maintenance for managing life and performance, Helsinki (Finland), 7-9 Sep 1998; Other Information: PBD: 1998; Related Information: Is Part Of BALTICA IV. Plant maintenance for managing life and performance; Hietanen, S.; Auerkari, P. [eds.] [VTT Manufacturing Technology, Espoo (Finland). Operational Reliability]; PB: 398 p.
Subject:
20 FOSSIL-FUELED POWER PLANTS; 36 MATERIALS SCIENCE; POWER PLANTS; EQUIPMENT; CHROMIUM-MOLYBDENUM STEELS; CREEP; CAVITATION; DAMAGE; SERVICE LIFE; RUPTURES; MATERIALS TESTING; MATHEMATICAL MODELS
OSTI ID:
324999
Research Organizations:
Technical Research Centre of Finland, Espoo (Finland)
Country of Origin:
Finland
Language:
English
Other Identifying Numbers:
Other: ON: DE99730863; ISBN 951-38-4577-X; TRN: FI9903083
Availability:
OSTI as DE99730863
Submitting Site:
FI
Size:
pp. 575-586
Announcement Date:
Apr 05, 1999

Citation Formats

Brear, J M, Church, J M, and Eggeler, G. Examination of observed and predicted measures of creep cavitation damage accumulation. Finland: N. p., 1998. Web.
Brear, J M, Church, J M, & Eggeler, G. Examination of observed and predicted measures of creep cavitation damage accumulation. Finland.
Brear, J M, Church, J M, and Eggeler, G. 1998. "Examination of observed and predicted measures of creep cavitation damage accumulation." Finland.
@misc{etde_324999,
title = {Examination of observed and predicted measures of creep cavitation damage accumulation}
author = {Brear, J M, Church, J M, and Eggeler, G}
abstractNote = {Brittle intergranular cavitation represents a primary degradation mechanism for high temperature plant operating within the creep range. Fundamental to formulating estimates of remanent life, or consumed life fraction for such components are: the observation and quantification of the level of actual creep cavitation, typically using an A-parameter type approach, and the correlation of observed creep damage accumulation with some phenomenological model which characterizes the rate of damage evolution and, thereby, rupture lifetime. The work described here treats inhomogeneous damage accumulation - in otherwise uniform material and loading situations. Extensions to the A-parameter are considered as a practical measure of damage localization and an extension of the Kachanov-Rabotnov continuum damage mechanics model is proposed to allow theoretical treatment. (orig.) 4 refs.}
place = {Finland}
year = {1998}
month = {Dec}
}