Objective
The analytical models which describe the contacts, the stress field, the initiation of crack and the conditions to reach the surface spalling have led to establish four typical criteria regarding the endurance limit (H1, H2, H3 and H4).
The fatigue tests conducted either on simulated contacts or on full bearings have been evaluated from damage point of view. The endurance limit of several materials has been obtained through the residual stress analysis of a wide range of samples.
In order to predict the endurance limit in relation with the residual stress versus depth, a representative parameter has been created: the characteristic deformation number.
The effect of temperature has been also determined on these steels :
* 100Cr6, M50-NIL and CRONIDUR 30
The values found on M50 correlated the H1 limit obtained from the analysis.
A part of the tests was devoted to contacts in gears.
The Barkhausen noise technic was used. A good correlation was observed with residual stress on 100Cr6 steel.
Deviation between calculated lives and services lives is due to a combination of material improvements,inadequate representation of the stress mechanism that cause failures and general oversimplification embodied in the general power law assumption.
This project proposes:
1. To support a significant progress in the development of a new fatigue model based on a physical/metallurgical microscopic approach with a macroscopic approach of the stress tensor (continuum mechanics).
2. To conduct monitored test in order to evaluate the real endurance limit of actual bearing steels and to identify the weight of influencing parameters:
- temperature
- hertzian stress
- hoop stress
- residual stress.
3. To achieve similar test in industrial situations,particularly in high speed conditions representing turbines engines applications.
4. To investigate damage effect on after service bearings and to correlate above analysis.
5. To investigate influence of similar parameters on the rolling/sliding contact subjected to similar fatigue phenomenon in gear applications.
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.
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.
Coordinator
64511 BORDES
France
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.