By O.T. Bruhns, E. Stein
This quantity comprises contributions awarded on the IUTAM Symposium on Micro- and Macrostructural features of Thermoplasticity. The symposium introduced jointly 87 eminent scientists from thirteen nations operating within the box of thermoplasticity with the purpose of replacing principles and stimulating interplay. the vast majority of the lectures coated the most topic of the symposium, with some of a extra basic keynote nature and a memorial lecture dedicated to the paintings of Th. Lehmann. This quantity starts off via offering uncomplicated questions of fabric modelling. difficulties encountered in polycrystalline fabrics also are mentioned and the transition from the micro- to the macroscale is the topic of numerous papers. The precise dealing with of form reminiscence fabrics, section transformation, and harm is emphasised. a number of papers are dedicated to experimental effects and many of the elements of numerical therapy. It has turn into transparent that in the past stated difficulties, notwithstanding approached from assorted viewpoints, may well frequently be dealt with equally. in addition, the processing of precise instances sensitized for a extra actual therapy in information. the amount should be of curiosity to researchers within the box of thermoplasticity.
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Extra resources for IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity (Solid Mechanics and Its Applications)
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50, to appear. C. and Miehe C. (1992), Associative coupled thermoplasticity at finite strains: Formulation, numerical analysis and implementation, Comp. Meth. Appl. Mech. Engrg. 98, 41-104. W. F. DAFALIAS Institute of Technology, Eng. & Cons. Group, Samsung Corporation San 25, Gongse-ri, Giheung-eup, Yongin-city, Kyunggi-do 449-900, Korea 2) Division of Mechanics, National Technical University of Athens 1) 5 Heroes of Polytechnion Avenue, Zorgraphou 15773, Greece and Dep. of Civil & Environ. , Univ.
Represents thermodynamic equilibrium, however, the equilibrium states depend on the process history in a rate independent manner. stands for the deviation from the equilibrium states, which are limits of relaxation or retarded processes. The equilibrium part is modelled utilizing the arclength representation. In this context, the introduction of a yield surface is optional but not necessary. For representing the non-equilibrium part the methods of nonlinear thermoviscoelasticity are applicable.
The prefix indicates the trace, and a superposed dot denotes the material time derivative or rate. 2. Combined Hardening Viscoplastic Model General kinematics and kinetics in large inelastic macroscopic formulation with the plastic spin concept were in a systematic way reviewed in Dafalias (1985, 1990). Bypassing the details thereof, Eulerian kinematics in small elastic and finite plastic deformations can be described as follows: where D, and denote the total, elastic and plastic rate of deformations, respectively, and W, and the total, substructural and plastic rate of rotations or spins, respectively.