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Creep Crack Assessment of Components at High Temperatures
Last modified: 2013-05-06
Abstract
During recent years a database on crack initiation and growth under creep and
creep fatigue loading was established. In order to make appropriate use of this
database for component assessment at high temperatures two-criteria methods for
crack initiation have been developed and C* based growth analyses was applied
and reviewed, the methods were implemented in a software system which consists
of data and calculation modules for analyses and assessments of components with
defects operated in the high temperature range.
The paper describes the methods used and their application using the developed
software. As an example the assessment of a crack in a pipe bend made of
martensitic 12 Cr steel is demonstrated. The assessment results determined by the
software “HT-Riss” revealed a fair correlation to the service life which was as
long as 185 000 h.
creep fatigue loading was established. In order to make appropriate use of this
database for component assessment at high temperatures two-criteria methods for
crack initiation have been developed and C* based growth analyses was applied
and reviewed, the methods were implemented in a software system which consists
of data and calculation modules for analyses and assessments of components with
defects operated in the high temperature range.
The paper describes the methods used and their application using the developed
software. As an example the assessment of a crack in a pipe bend made of
martensitic 12 Cr steel is demonstrated. The assessment results determined by the
software “HT-Riss” revealed a fair correlation to the service life which was as
long as 185 000 h.
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