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Constitutive modeling for isotropic materials (host)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Chan, Kwai S. Weber, R. M. Bodner, S. R. Lindholm, Ulric S. Walker, K. P. Cassenti, B. N. |
| Copyright Year | 1984 |
| Description | The results of the first year of work on a program to validate unified constitutive models for isotropic materials utilized in high temperature regions of gas turbine engines and to demonstrate their usefulness in computing stress-strain-time-temperature histories in complex three-dimensional structural components. The unified theories combine all inelastic strain-rate components in a single term avoiding, for example, treating plasticity and creep as separate response phenomena. An extensive review of existing unified theories is given and numerical methods for integrating these stiff time-temperature-dependent constitutive equations are discussed. Two particular models, those developed by Bodner and Partom and by Walker, were selected for more detailed development and evaluation against experimental tensile, creep and cyclic strain tests on specimens of a cast nickel base alloy, B19000+Hf. Initial results comparing computed and test results for tensile and cyclic straining for temperature from ambient to 982 C and strain rates from 10(exp-7) 10(exp-3) s(exp-1) are given. Some preliminary date correlations are presented also for highly non-proportional biaxial loading which demonstrate an increase in biaxial cyclic hardening rate over uniaxial or proportional loading conditions. Initial work has begun on the implementation of both constitutive models in the MARC finite element computer code. |
| File Size | 4270578 |
| Page Count | 136 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900004075 |
| Archival Resource Key | ark:/13960/t5v748m9k |
| Language | English |
| Publisher Date | 1984-05-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Creep Properties Nickel Alloys Stress Cycles Gas Turbine Engines Engine Parts Cast Alloys Computer Programs Finite Element Method Isotropy Heat Resistant Alloys Mathematical Models Plastic Properties Strain Hardening Tensile Properties Constitutive Equations Strain Rate Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
