Effects of Overloads and Creep on the Yield Surface of a Nickel-based Superalloy

  • M. R. Winstone
  • G. F. Harrison


During typical flight cycles, a gas turbine blade is subjected to a complex multiaxial stress cycle due to the combination of centrifugal, thermal and gas loading stresses. Cyclic deformation of the blade occurs due to time-independent plastic strain and time-dependent creep strain. In the life prediction analysis of the blade account should be taken of the effects of deformation on the redistribution of the cyclic stresses. Before such calculations are possible, the multiaxial deformation behaviour of the material must be known, both during the first loading cycle and during subsequent cycles when the effects of work-hardening and prior creep are significant. For example, plasticity strains are estimated by assuming a multiaxial yield surface but the surface can be enlarged and distorted by previous loading cycles.


Acoustic Emission Yield Surface Test Piece Bauschinger Effect Kinematic Hardening Model 
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Copyright information

© Elsevier Copyright 1986

Authors and Affiliations

  • M. R. Winstone
    • 1
  • G. F. Harrison
    • 1
  1. 1.Royal Aircraft EstablishmentFarnborough, HantsUK

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