Metodutveckling för containmentdimensionering

Method development for containment sizing

Goals/targets: Several static parts of commercial aero engines are required to have containment capability; this implies that the structure that surrounds the rotating parts of the engine must prevent released parts due to a blade off event to cause damages on the surrounding aircraft. Traditionally conservative hand calculation methods are used, methods that only in a limited way takes the involved physics, e.g. rotational speed, temperature and geometry, into account. Therefore it is desirable to utilize a numerical method to simulate and analyze the capability of a structure to contain a released blade. The goal is to use modern analysis tools based on explicit FEM to be able to take into account for the physical behavior of the problem and thereby gain new and safer margins that enables lower weight of these components. Result and effects In the proposed project an analysis method for containment will be developed to the technology readiness level TRL 4. The material model will be developed and tested for one relevant material. All implementation will be made in a general commercial soft ware that is available to the industry. The project will profile Volvo Aero as a company with the ability to develop low weight products that strongly contributes to manage the aero industry environmental goals for today and the future. Planning and implementing The project is realized in the following steps: 1) Choice of material and mainly conventional material testing. 2) Validation of chosen material model using testing that captures the behavior at high strain rates. 3) Validate the methods ability to predict when penetration of a blade like object occurs (TRL4). 4) Define the process from material testing to containment analysis in a way that continued analysis of containment and rotating containment testing leads to a technology readiness level of 6. The work is carried out by a PhD student at the Department for Solid Mechanics, Univserity of Luleå (LTU) where necessary experimental resources and personnel with relevant experience and supervising skills are available. A steering committee is formed by people from Volvo Aero and Solid Mechanics at LTU.