Creep, Plasticity, and Fatigue of Single Crystal Superalloy. (Preprint)
Abstract
Single crystal components in gas turbine engines are subject to such extreme temperatures and stresses that life prediction becomes highly inaccurate resulting in components that can only be shown to meet their requirements through experience. Reliable life prediction methodologies are required both for design and life management. In order to address this issue we have developed a thermo-viscoplastic constitutive model for single crystal materials. Our incremental large strain formulation additively decomposes the inelastic strain rate into components along the octahedral and cubic slip planes. We have developed a crystallographic-based creep constitutive model based on Orowan's law and applied specifically to sigmoidal creep behavior. Inelastic shear rate along each slip system is expressed as a sum of a time dependent creep component and a rate independent plastic component. We develop a new robust and computationally efficient rate-independent crystal plasticity formulation and combined it with creep flow rule calibrated for Ni-based superalloys.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 2011
- Accession Number
- ADA548437
Entities
People
- Alexander Staroselsky
- Brice N. Cassenti
Organizations
- United Technologies Corporation