A theoretical comparison of three unified viscoplasticity theories, and application to the uniaxial behaviour of Inconel 718 at 1100°F
| Autor: | A. M. Eleiche, N. N. El-Hefnawy, M. S. Abdel-Kader |
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| Rok vydání: | 1991 |
| Předmět: |
Nuclear and High Energy Physics
Engineering Viscoplasticity business.industry Tension (physics) Mechanical Engineering Isotropy Experimental data Monotonic function Mechanics Structural engineering Nuclear Energy and Engineering Creep General Materials Science Safety Risk Reliability and Quality business Inconel Waste Management and Disposal Test data |
| Zdroj: | Nuclear Engineering and Design. 128:369-381 |
| ISSN: | 0029-5493 |
| DOI: | 10.1016/0029-5493(91)90173-f |
| Popis: | Recently, a number of unified elasto—viscoplastic constitutive theories have been proposed and employed for modelling time-dependent inelastic behaviour of initially isotropic, strain-hardening, rate-sensitive engineering materials under general loading histories that combine monotonic, sustained, and cyclic loading stages. This paper presents a theoretical and experimental comparative study of the three leading theories of Chaboche, Bodner, and Walker. The basic structures of these theories are examined, their major advantages and limitations highlighted, and the principal similarities and differences among them explained. Incorporation of dynamic strain ageing modelling capability into these theories is also demonstrated. Moreover, the theories are compared with experiments for elevated temperature application. First, the material parameters of each theory are evaluated and revised using available uniaxial test data for Inconel 718 at 1100°F (593°C). Second, the theories are employed to predict the response to monotonic tension, creep and cyclic loading. These predictions are then verified by comparison with corresponding experimental data available. The three theories appear to be capable of modelling the main features of the inelastic behaviour of Inconel 718 at 1100°F, with varying degrees of acceptability. Chaboche theory, however, seems to offer the greatest promise in this regard. |
| Databáze: | OpenAIRE |
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