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Thermal cycling and isothermal deformation response of polycrystalline niti: simulations vs. experiment
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Gaydosh, Darrell Noebe, Ronald Vaidyanathan, Raj Anderson, Peter M. Manchiraju, Sivom Benafan, Othmane |
| Copyright Year | 2011 |
| Description | A recent microstructure-based FEM model that couples crystal-based plasticity, the B2<-> MB190 phase transformation and anisotropic elasticity at the grain scale is calibrated to recent data for polycrystalline NiTi (49.9 at.% Ni). Inputs include anisotropic elastic properties, texture and differential scanning calorimetry data, as well as a subset of recent isothermal deformation and load-biased thermal cycling data. The model is assessed against additional experimental data. Several experimental trends are captured - in particular, the transformation strain during thermal cycling monotonically increases and reaches a peak with increasing bias stress. This is achieved, in part, by modifying the martensite hardening matrix proposed by Patoor et al. [Patoor E, Eberhardt A, Berveiller M. J Phys IV 1996;6:277]. Some experimental trends are underestimated - in particular, the ratcheting of macrostrain during thermal cycling. This may reflect a model limitation that transformation-plasticity coupling is captured on a coarse (grain) scale but not on a fine (martensitic plate) scale. |
| File Size | 1372348 |
| File Format | |
| Language | English |
| Publisher Date | 2011-08-01 |
| Access Restriction | Open |
| Subject Keyword | Mechanical Engineering Deformation Shape Memory Alloys Nickel Alloys Phase Transformations Polycrystals Thermal Cycling Tests Finite Element Method Titanium Alloys Simulation Plastic Properties Elastic Properties Microstructure Martensite Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
