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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2002

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Further Development of the creep-fatigue prediction methods frequency separation method and strain range partitioning method and crack propagation prediction for the recent titanium alloy Timetal TI 834

Nowack H., Kordisch T., Baum Ch.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2002

z. 73

47-74

The original Strain Range Partitioning (SRP) method and the Frequency Separation (FS) method for predictions of the creep-fatigue behaviour of thermome-chanically loaded structures have been proposed a long time ago. However, they are still of interest because they explicitly consider the combined action of time independent and time dependent contributions to the creep-fatigue life behaviour. Meanwhile these methods have reached a high state in development. In the present paper some proposals for a further improvement of the prediction capability of these methods are included. For an application of high temperature materials in practise a careful consideration of the microstructure has also to be performed. Typical microscopical phenomena and processes are briefly described in the first part of the paper. The material that has been considered in more detail in the paper is the new titanium alloy Timetal 834. The properties and the thermomechanical behaviour of this alloy are presented. The alloy is sensitive to the environment at higher temperatures. Various engineering tools to predict the time dependent mechanical behaviour are presented including the SRP method and the FS method as mentioned above. The third part of the paper deals with the crack extension behaviour under high temperature conditions. It is shown that predictions for long time applications still include some risk. In the crack stage the environmental condition is also important.