Item Type: 
Ph.D. Thesis 
Title: 
Thermodynamically Consistent Formulation of Induced Anisotropy in Polar Ice Accounting for Grain Rotation, Grainsize Evolution and Recrystallization. 
Language: 
English 
Abstract: 
In this thesis we present a general theory able to comprehend important phenomena related to the dynamics of a polycrystalline material such as the ice of an ice sheet. The theoretical framework is founded upon the Theory of Mixtures with Continuous Diversity, for which the second law of thermodynamics is exploited to get a complete set of restrictions on the constitutive equations. The main goal of such an exploitation is to provide a theoretical tool to investigate the effects of the micostructure on the mechanical behaviour of polycrystalline materials. An explicit anisotropic constitutive law is given for the stretching tensor of an incompressible polycrystalline material in terms of its deviatoric stress tensor and of the distribution (Orientation Distribution Function or ODF) of the lattice orientations of the crystallites belonging to the polycrystal. Such a law is able to comprehend the mechanical response for any state of deformation, it is objective and its validity is checked by some remarkable examples. The evolution of the anisotropy is modelled with the aid of the evolution of the ODF, and it is not postulated ab initio. The balance of mass, as it is given in the form of the presented mixture with continuous diversity, provides such an evolution equation, that contains two constitutive functions. They are able to model the grain rotation and the Grain Boundary Migation (GBM) and recrystallization, respectively. We provide also a proposal for the explicit form of these two functions. From the balance of mass in the form of the presented mixture with continuous diversity, we have also derived a general evolution equation of the distribution of grain sizes. Two constitutive functions are present in this new equation. They are able to model the effects of grain growth and polygonization, respectively, on the evolution of the distribution of grain sizes. Even in this case, we give our proposal for the explicit form of these two functions. Results about the evolution of the dislocation density is also given. 
Alternative Abstract: 
Alternative Abstract  Language 

In this thesis we present a general theory able to comprehend important phenomena related to the dynamics of a polycrystalline material such as the ice of an ice sheet. The theoretical framework is founded upon the Theory of Mixtures with Continuous Diversity, for which the second law of thermodynamics is exploited to get a complete set of restrictions on the constitutive equations. The main goal of such an exploitation is to provide a theoretical tool to investigate the effects of the micostructure on the mechanical behaviour of polycrystalline materials. An explicit anisotropic constitutive law is given for the stretching tensor of an incompressible polycrystalline material in terms of its deviatoric stress tensor and of the distribution (Orientation Distribution Function or ODF) of the lattice orientations of the crystallites belonging to the polycrystal. Such a law is able to comprehend the mechanical response for any state of deformation, it is objective and its validity is checked by some remarkable examples. The evolution of the anisotropy is modelled with the aid of the evolution of the ODF, and it is not postulated ab initio. The balance of mass, as it is given in the form of the presented mixture with continuous diversity, provides such an evolution equation, that contains two constitutive functions. They are able to model the grain rotation and the Grain Boundary Migation (GBM) and recrystallization, respectively. We provide also a proposal for the explicit form of these two functions. From the balance of mass in the form of the presented mixture with continuous diversity, we have also derived a general evolution equation of the distribution of grain sizes. Two constitutive functions are present in this new equation. They are able to model the effects of grain growth and polygonization, respectively, on the evolution of the distribution of grain sizes. Even in this case, we give our proposal for the explicit form of these two functions. Results about the evolution of the dislocation density is also given.  English 

Place of Publication: 
Darmstadt 
Uncontrolled Keywords: 
Grain Boundary Migration, Continuous Diversity, Lagrange Multipliers, Ice cores 
Alternative keywords: 
Alternative keywords  Language 

Grain Boundary Migration, Continuous Diversity, Lagrange Multipliers, Ice cores  English 

Classification DDC: 
500 Naturwissenschaften und Mathematik > 500 Naturwissenschaften 
Divisions: 
Study Areas > Study Area Mechanic 
Date Deposited: 
17 Oct 2008 09:22 
Last Modified: 
21 Mar 2016 10:59 
URL / URN: 
http://elib.tudarmstadt.de/diss/000614 
URN: 
urn:nbn:de:tudatuprints6145 
Referees: 
Hutter, Prof. Kolumban ; Svendsen, Prof. Dr. Bob 
Advisors: 
Hutter, Ph. D. Kolumban; Prof. 
Date of oral examination: 
17 November 2004 
URI: 
https://tuprints.ulb.tudarmstadt.de/id/eprint/614 
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