Objective
1.To understand the thermomechanical fatigue behaviour of coated single crystal turbine blade materials with particular reference to the effects of :
(a) material variables - alloy and coating composition and microstructure
(b) thermomechanical variables - strain-temperature cycle, strain range, strain rate, min. and max. temperature, R ratio.
2.To characterize the thermomechanical fatigue behaviour of coated blade materials in terms of the initiation and growth stages of cracking and to determine their dependence upon the material and thermomechanical variables.
3.To formulate and validate a model to accurately predict the thermomechanical fatigue behaviour of coated turbine blade alloys.
A video system linked to a computerised image capturing system was developed at JRC Petten. A test programme of seventy three TMF tests was completed at JRC Petten, complimented by sixteen TMF tests at Rolls-Royce, and eleven TMF tests and thirteen isothermal crack propagation studies at MTU. The quality of all the data produced appears to be very high, and the testing procedures developed has contributed to testing standards definition. The testing has revealed quantitative data on the propagation of micro cracks in coated and uncoated superalloys. Out of phase (OOP) testing conditions were shown to promote cracking early in life leading to the shortest lives to failure, with the majority of the test piece life spent in the substrate propagation stage. In phase (IP) tests gave failures dominated by substrate porosity effects, and largely unaffected by the presence of coatings. The same models for early crack initiation and for substrate crack propagation in OOP tests hold up quite well for both diffusion and overlay coatings, even though the behavioural characteristics of these two coating types can be very different.
In analysing the data produced, two approaches have been undertaken. One was to use empirical methods to fit the available data. The second was to develop models which encapsulated a basic understanding of the mechanisms involved. Both approaches yielded system specific models which fulfilled the basic accuracy levels required from them. Each type of model is only valid within the regime in which the failure mechanisms remain sensibly constant. Neither approach can be depended upon if the failure mechanisms change, and neither approach, in their current formulations, has any ability to predict the onset of a change in fracture mechanism.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
You need to log in or register to use this function
Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Data not available
Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Data not available
Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Data not available
Coordinator
BS12 7QE BRISTOL
United Kingdom
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.