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KnowledgeResearch DisciplinesMaterials in the aero engines The modern aeronautic propellers must satisfy tightening requirement in terms of emissions, reliability, performances, economy and duration. In this scenario the corrected selection of materials and productive technologies in relation to the characteristics of members to realize and use conditions is fundamental for the attainment of prefixed objectives with contained costs. The used materials must have high performances but above all to be carefully controlled and reliable. Every new material must be in fact carefully characterized, verified and approved by the aeronautics authorities before its I use. Traditionally the used materials are already very many, differentiated according to the composition and use requirement, but the studies continue to overcome limits given by today's technologies and found new materials with always better characteristics. At material classes level can be distinguished:
Heat Transfer discipline The high temperatures reached in the aero engines due to more and more performing thermodynamic cycles, carry its components to work in thermal stress conditions more and more critical. Many used materials are not in a position to work at so high temperatures and require continuous cooling to guarantee the life of same components. Moreover the high temperatures induce deformations that must be known and controlled, in all operation conditions, in order to not put in crisis same engine performances. AVIO is investing a lot in order to develop whether technologies or numerical simulation abilities within thermal sphere, necessary to support development of next engine generations. Main activity areas concern:
Development of aerothermal discipline The aerothermal discipline is considered an important lever able to qualify radical renewals (step change) to the aerospace propulsion. Within this sphere, Avio is aiming to develop with great determination following objectives:
Structural integrity discipline In the modern aero engines, the several engine components are subject to more and more high solicitations and a continuous process for parts lightening is always in course, to improve the product competitiveness. The structural integrity disciplines occupy themselves of studies in order to prevent the breaks, excessive wear, and components malfunction. Through various research programs, on national and European level, it is studied the way to try to reduce design margins, always continuing to satisfy the specification requirements in terms of performances and safety. Main activity areas are following:
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