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diff --git a/Mechanical_Metallurgy_by_George_E._Dieter/Chapter_1.ipynb b/Mechanical_Metallurgy_by_George_E._Dieter/Chapter_1.ipynb
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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Chapter 1: Introduction"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Example 1.1, Shear Stress, Page No. 16"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Shear Stress Required to nucleate a grain boundary crack in high temperature deformation = 158.887 MPa\n"
-     ]
-    }
-   ],
-   "source": [
-    "#variable declaration\n",
-    "from math import pi\n",
-    "from math import sqrt\n",
-    "y_b=2;\n",
-    "G=75;\n",
-    "G=G*10**9;       #conversion to Pa\n",
-    "L=0.01;\n",
-    "L=L*10**-3;       #conversion to m\n",
-    "nu=0.3;\n",
-    "\n",
-    "#calculation\n",
-    "T=sqrt((3*pi*y_b*G)/(8*(1-nu)*L));\n",
-    "T=T/10**6;\n",
-    "\n",
-    "#result\n",
-    "print ('Shear Stress Required to nucleate a grain boundary crack in high temperature deformation = %g MPa') %(T)"
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 2",
-   "language": "python",
-   "name": "python2"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 2
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython2",
-   "version": "2.7.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 0
-}