Three-dimensional, finite deformation, rate-dependent plasticity in single-crystal nickel alloys at elevated temperatures
✍ Scribed by A.S. Oddy; R.C. Reed; J.M.J. McDill
- Book ID
- 104269284
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 278 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0045-7949
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✦ Synopsis
Future increases in gas turbine performance will require numerical algorithms capable of predicting the deformation and rupture of blade materials at elevated temperatures. The current generation of Ni-based superalloys requires constitutive models for rate-dependent plastic deformation of single-crystal turbine blades. Ni-based superalloys show a complicated relationship between temperature and slip on octahedral or cubic slip systems, including softening. A threedimensional (3-D) ®nite deformation algorithm is presented for ®nite element analysis (FEA) of stress and strain histories in anisotropic elastic materials with rate-dependent slip on speci®c, multiple slip systems. The FEA includes multiplicative decomposition of the deformation gradients, Hencky strain tensor, and Green±Naghdi stress rate with temperature-dependent crystal slip relations to compute ®nite deformation, slip induced rotations and material softening. Deformation predictions of Ni-based superalloys are compared with experimental measurements and analytical solutions. Good agreement is found, especially when the specimen-to-specimen variations are considered.