Download IUTAM Symposium on Micro- and Macrostructural Aspects of by O.T. Bruhns, E. Stein PDF
By O.T. Bruhns, E. Stein
This quantity comprises contributions awarded on the IUTAM Symposium on Micro- and Macrostructural facets of Thermoplasticity. The symposium introduced jointly 87 eminent scientists from thirteen nations operating within the box of thermoplasticity with the purpose of changing principles and stimulating interplay. nearly all of the lectures coated the most subject of the symposium, with some of a extra common keynote nature and a memorial lecture dedicated to the paintings of Th. Lehmann.
This quantity starts by way of providing easy 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 a number of papers. The detailed dealing with of form reminiscence fabrics, section transformation, and harm is emphasised. a number of papers are dedicated to experimental effects and some of the points of numerical remedy. It has develop into transparent that in the past brought up difficulties, although approached from diversified viewpoints, may possibly usually be dealt with equally. in addition, the processing of certain circumstances sensitized for a extra exact remedy in info.
the quantity can be of curiosity to researchers within the box of thermoplasticity.
Read Online or Download IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity: Proceedings of the IUTAM Symposium held in Bochum, Germany, 25-29 August 1997 PDF
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Extra resources for IUTAM Symposium on Micro- and Macrostructural Aspects of Thermoplasticity: Proceedings of the IUTAM Symposium held in Bochum, Germany, 25-29 August 1997
Example text
The load history corresponding to a case of loading/unloading/negativ-loading is chosen so as to result in a linearly increasing/linearly decreasing displacement at the top with a deformation velocity of 1 mm/sec. 5 sec and altogether 400 time steps are computed. Within the last 10 time steps the displacement of point A is frozen. Relaxation effects take then place as slightly indicated in the plot. A configuration corresponding to a maximum deformation of the cylinder is included in the Figure.
Among these thermodynamic consistency is an important macrostructural aspect. The representation by means of internal variables is considered in view of a thermodynamic interpretation of viscoplasticity and plasticity. 2. Theory of Internal Variables A thermokinematic process consists of a Green strain tensor and the temperature ~ as functions of space and time. It determines the thermodynamic response of a material element: the free energy _ the internal energy e, the entropy s, the stress tensor (S = (detF)T, T = Cauchy stress) and the heat flux vector It is sufficient to specify constitutive equations for the free energy and the heat flux together with evolution equations for a set of internal variables To begin with, the physical meaning of the internal variables is left unspecified, apart from the inelastic strain: is a Green strain tensor, defined from the multiplicative decomposition of the deformation gradient, It is convenient to introduce the difference into the free energy function as an independent variable instead of the total strain E, 3 O.
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. A. ABSTRACT. Within the framework of anisotropic combined viscoplastic hardening formulation, accounting macroscopically for residual stress as well as texture development at finite deformations of metals, simple shear analyses for the simulation of fixed-end torsion experiments for Al and Cu at different strain rates are reviewed with an emphasis on the role of constitutive spins.