diff --git a/documentation/ConstitutiveLaw/DisloTwinLaw/Tex Files/[06_10_2009]_MSU_TwinMeeting.tex b/documentation/ConstitutiveLaw/DisloTwinLaw/Tex Files/[06_10_2009]_MSU_TwinMeeting.tex new file mode 100644 index 000000000..2a53772a4 --- /dev/null +++ b/documentation/ConstitutiveLaw/DisloTwinLaw/Tex Files/[06_10_2009]_MSU_TwinMeeting.tex @@ -0,0 +1,177 @@ +\documentclass{beamer} + +\usepackage{amsmath,amssymb,amsfonts} +\usepackage{bm} +\usepackage{array} +%\include{Shortcuts} +\newcommand{\ie}{\textit{i.e.}} +\newcommand{\eg}{\textit{e.g.}} +\newcommand{\vect}[1]{\ensuremath{\mathbf{#1}}} +\newcommand{\tensII}[1]{\ensuremath{\mathbf{#1}}} +\newcommand{\tensIV}[1]{\ensuremath{\mathbb{#1}}} +\newcommand{\slip}[1]{\ensuremath{#1^{\alpha}}} +\newcommand{\slipslip}[1]{\ensuremath{#1^{\alpha\alpha}}} +\newcommand{\slipt}[1]{\ensuremath{#1^{\tilde\alpha}}} +\newcommand{\slipslipt}[1]{\ensuremath{#1^{\alpha\tilde\alpha}}} +\newcommand{\twin}[1]{\ensuremath{#1^{\beta}}} +\newcommand{\twint}[1]{\ensuremath{#1^{\tilde\beta}}} +\newcommand{\twintwint}[1]{\ensuremath{#1^{\beta\tilde\beta}}} +\newcommand{\sliptwin}[1]{\ensuremath{#1^{\alpha\beta}}} +\newcommand{\twinslip}[1]{\ensuremath{#1^{\beta\alpha}}} + +\usetheme{mpie} +\setbeamertemplate{blocks}[rounded][shadow=true] + +\title{Dislocation structure and kinetics in slip-twin model} +\date{MSU Twin Meeting, Duesseldorf -- October 6$^{\textsf{th}}$, 2009} + +\begin{document} + +\frame{\titlepage} + +\frame { + \frametitle{Dislocation structure parametrization} + + \begin{block}{Internal variables:} + \begin{itemize} + \item<1-> $\slip N$ edge dislocation densities $\slip\varrho_{\text{edge}}$ + \item<1-> $\slip N$ dipole densities $\slip\varrho_{\text{dipole}}$ + \end{itemize} + \end{block} + + \begin{block}{Derived measures:} + \begin{itemize} + \item<1-> $\slip\tau_{\mathrm{c}}$ threshold shear stress + \item<1-> $\slip\lambda$ mean distance between 2 obstacles seen by a dislocation + \end{itemize} + \end{block} +} + +\frame { + \frametitle{Dislocation structure parametrization} + + \begin{block}{Threshold stress $\slip\tau$:} + \begin{equation} + \slip\tau_{\text{c}} = G_{\text{iso}}\,\slip b\,\sqrt{\sum_{\tilde\alpha\,=\,1}^{\slip N}\,\slipslipt\xi\,(\slipt\varrho_{\text{edge}} + \slipt\varrho_{\text{dipole}})} \nonumber + \end{equation} + \end{block} + + \begin{block}{with:} + \begin{itemize} + \item<1-> $G_{\text{iso}}$ Isotropic shear modulus + \item<1-> $\slip b$ Burgers vector of slip system $\alpha$ + \item<1-> $\slipslipt\xi$ interaction strength (Kubin et al. 2008) + \end{itemize} + \end{block} +} + +\frame { + \frametitle{Orowan's kinetics} + + \begin{block}{Shear rate $\slip{\dot\gamma}$:} + \begin{equation} + \slip{\dot\gamma} = \slip\varrho_{\text{edge}}\,\slip b\,\slip v_{\text{glide}} \nonumber + \end{equation} + \end{block} + + \begin{block}{Velocity $\slip v_{\text{glide}}$:} + \begin{equation} + \slip v_{\text{glide}} = v_0\, + \exp{\left[-\dfrac{Q}{k_{\text{B}}\,T}\,\left(1-\left(\dfrac{|\slip\tau|}{\slip\tau_{\text{c}}}\right)^p\right)^q\right]} \operatorname{sign}(\slip\tau) \nonumber + \end{equation} + \end{block} + + \begin{block}{with:} + \begin{itemize} + \item<1-> $v_0$ Velocity pre-factor + \item<1-> $Q$ Activation energy for dislocation glide + \item<1-> $k_{\text{B}}\,T$ Boltzmann energy + \end{itemize} + \end{block} +} + +\frame { + \frametitle{Dislocation multiplication} + + \begin{block}{Multiplication:} + \begin{equation} + \slip{\dot\varrho_{\text{multiplication}}} = \dfrac{|\slip{\dot\gamma}|}{\slip b\,\slip\lambda} \nonumber + \end{equation} + \end{block} +} + +\frame { + \frametitle{Dislocation dipole formation} + + \begin{block}{Dipole formation:} + \begin{equation} + \slip{\dot\varrho_{\text{formation}}} = 2\,\dfrac{2\,\slip{\hat d}}{\slip b}\,\dfrac{\slip\varrho_{\text{edge}}}{2}\,|\slip{\dot\gamma}| \nonumber + \end{equation} + \end{block} + + \begin{block}{Length $\slip{\hat d}$:} + \begin{equation} + \slip{\hat d} = \dfrac{1}{8\,\pi}\,\dfrac{G_{\text{iso}}\,\slip b}{1-\nu}\,\dfrac{1}{|\slip\tau|} \nonumber + \end{equation} + \end{block} +} + +\frame { + \frametitle{Spontaneous annihilation of 2 single dislocations} + + \begin{block}{Single-single annihilation:} + \begin{equation} + \slip{\dot\varrho_{\text{single-single}}} = 2\,\dfrac{2\,\slip{\check d}}{\slip b}\,\dfrac{\slip\varrho_{\text{edge}}}{2}\,|\slip{\dot\gamma}| \nonumber + \end{equation} + \end{block} + + \begin{block}{Length $\slip{\check d}$:} + \begin{equation} + \slip{\check d} \propto \slip b \nonumber + \end{equation} + \end{block} +} + +\frame { + \frametitle{Spontaneous annihilation of one single dislocation and one dipole constituent} + + \begin{block}{Single-dipole constituent annihilation:} + \begin{equation} + \slip{\dot\varrho_{\text{single-dipole}}} = 2\,\dfrac{2\,\slip{\check d}}{\slip b}\,\dfrac{\slip\varrho_{\text{dipole}}}{2}\,|\slip{\dot\gamma}| \nonumber + \end{equation} + \end{block} +} + +\frame { + \frametitle{Dislocation dipole climb} + + \begin{block}{Dipole climb:} + \begin{equation} + \slip{\dot\varrho_{\text{climb}}} = \slip\varrho_{\text{dipole}}\,\dfrac{4\,v_{\text{climb}}}{\slip{\hat d}+\slip{\check d}} \nonumber + \end{equation} + \end{block} + + \begin{block}{Climb velocity $\slip v_{\text{climb}}$:} + \begin{equation} + \slip v_{\text{climb}} = \dfrac{D\,\slip\Omega}{\slip b\,k_{\text{B}}\,T}\,\dfrac{G_{\text{iso}}\,\slip b}{2\,\pi\,(1-\nu)}\,\dfrac{2}{\slip{\hat d}+\slip{\check d}} \nonumber + \end{equation} + \end{block} +} + +\frame { + \frametitle{Evolution of dislocation densities} + + \begin{block}{Edge dislocation density rate:} + \begin{equation} + \slip{\dot\varrho_{\text{edge}}} = \slip{\dot\varrho_{\text{multiplication}}} - \slip{\dot\varrho_{\text{formation}}} - \slip{\dot\varrho_{\text{single-single}}} \nonumber + \end{equation} + \end{block} + +\begin{block}{Dislocation dipole density rate:} + \begin{equation} + \slip{\dot\varrho_{\text{dipole}}} = \slip{\dot\varrho_{\text{formation}}} - \slip{\dot\varrho_{\text{single-dipole}}} - \slip{\dot\varrho_{\text{climb}}} \nonumber + \end{equation} + \end{block} +} + +\end{document} \ No newline at end of file