dorsal/arxiv
View SchemaA study of a hamiltonian model for martensitic phase transformations including microkinetic energy
| Authors | F. Theil, V. I. Levitas |
|---|---|
| Categories | |
| ArXiv ID | patt-sol/9811006 |
| URL | https://arxiv.org/abs/patt-sol/9811006 |
Abstract
How can a system in a macroscopically stable state explore energetically more favorable states, which are far away from the current equilibrium state? Based on continuum mechanical considerations we derive a Boussinesq-type equation which models the dynamics of martensitic phase transformations. The solutions of the system, which we refer to as microkinetically regularized wave equation exhibit strong oscillations after short times, thermalization can be confirmed. That means that macroscopic fluctuations of the solutions decay at the benefit of microscopic fluctuations. First analytical and numerical results on the propagation of phase boundaries and thermalization effects are presented. Despite the fact that model is conservative, it exhibits the hysteretic behavior. Such a behavior is usually interpreted in macroscopic models in terms of dissipative threshold which the driving force has to overcome to ensure that the phase transformation proceeds. The threshold value depends on the amount of the transformed phase as it is observed in known experiments. Secondly we investigate the dynamics of oscillatory solutions. We present a formalism based on Young measures, which allows us to describe the effective dynamics of rapidly fluctuating solutions. The new method enables us to derive a numerical scheme for oscillatory solutions based on particle methods.
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"abstract": "How can a system in a macroscopically stable state explore energetically more\nfavorable states, which are far away from the current equilibrium state? Based\non continuum mechanical considerations we derive a Boussinesq-type equation\nwhich models the dynamics of martensitic phase transformations. The solutions\nof the system, which we refer to as microkinetically regularized wave equation\nexhibit strong oscillations after short times, thermalization can be confirmed.\nThat means that macroscopic fluctuations of the solutions decay at the benefit\nof microscopic fluctuations. First analytical and numerical results on the\npropagation of phase boundaries and thermalization effects are presented.\nDespite the fact that model is conservative, it exhibits the hysteretic\nbehavior. Such a behavior is usually interpreted in macroscopic models in terms\nof dissipative threshold which the driving force has to overcome to ensure that\nthe phase transformation proceeds. The threshold value depends on the amount of\nthe transformed phase as it is observed in known experiments. Secondly we\ninvestigate the dynamics of oscillatory solutions. We present a formalism based\non Young measures, which allows us to describe the effective dynamics of\nrapidly fluctuating solutions. The new method enables us to derive a numerical\nscheme for oscillatory solutions based on particle methods.",
"arxiv_id": "patt-sol/9811006",
"authors": [
"F. Theil",
"V. I. Levitas"
],
"categories": [
"patt-sol",
"nlin.PS"
],
"title": "A study of a hamiltonian model for martensitic phase transformations including microkinetic energy",
"url": "https://arxiv.org/abs/patt-sol/9811006"
},
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