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Title: Life Enhancement of Aero Engine Components by Shot Peening: Opportunities and Risks
Author: Gerhard W. Konig, MTU Aero Engines, Munich, German
Source: Conf Proc: ICSP-8 Sept. 16-20, 2002 Garmisch-Partenkirchen, Germany
Publication year 2002
Document number: 2002003
Number of pages: 10
Abstract:
Abstract
In service, aero engine parts are subject to high temperatures and extreme cyclic loads. As a consequence, the initiation and propagation of surface fatigue cracks is
life-limiting for many components. The application of surface treatments, such as shot peening, can cause a shift of the crack initiation site from surface to subsurface and
concomitantly, a significant increase in the cyclic life. However, in practice, the actual improvement achieved by shot peening is sometimes found to be less than expected.
One reason is that residual stresses produced by shot peening are not stable against high temperatures and non-elastic deformation induced by service loads. Another reason
is that defects (intrinsic defects of the material, surface defects caused by handling as well as surface damage caused by peening itself) may also reduce the benefit of
shot peening. The following paper discusses the possibilities to exploit the benefits of shot peening for life enhancement of aero engine components and the requirements
that must be fulfilled to take full advantage of shot peening.
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This page last revised: 04/24/2008