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Specific hardening function definition and characterization of a multimechanism generalized potential-based viscoelastoplasticity model. (English) Zbl 1135.74303

Summary: Given the previous complete-potential structure framework [see the authors, Int. J. Plast. 10, No. 3, 263–278 (1994; Zbl 0814.73026)], together with the notion of strain- and stress- partitioning in terms of separate contributions of several submechanisms (viscoelastic and viscoplastic) to the thermodynamic functions (stored energy and dissipation), see [the first author, Int. J. Plast. 17, No. 10, 1305–1350 (2001; Zbl 1078.74524)], a detailed viscoelastoplastic multimechanism characterization of a specific hardening functional form of the model is presented and discussed. TIMETAL 21S is the material of choice as a comprehensive test matrix, including creep, relaxation, constant strain-rate tension tests, etc. are available at various temperatures. Discussion of these correlations tests, together with comparisons to several other experimental results, are given to assess the performance and predictive capabilities of the present model particularly with regard to the notion of hardening saturation as well as the interaction of multiplicity of dissipative (reversible/irreversible) mechanisms.

MSC:

74C10 Small-strain, rate-dependent theories of plasticity (including theories of viscoplasticity)
74D10 Nonlinear constitutive equations for materials with memory
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