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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Chapter 7: Fracture"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Example 7.1, Cohesive Strength, Page No. 245"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Cohesive strength of a silica fiber = 24.367 GPa\n"
-     ]
-    }
-   ],
-   "source": [
-    "from math import sqrt\n",
-    "\n",
-    "#variable declaration\n",
-    "E=95;\n",
-    "E=E*10**9;\n",
-    "Ys=1000;\n",
-    "Ys=Ys*10**-3;                 #conversion to J/m^2\n",
-    "a0=1.6;\n",
-    "a0=a0*10**-10;                   #conversion to m\n",
-    "\n",
-    "#calculation\n",
-    "sigma_max=sqrt(E*Ys/a0)\n",
-    "sigma_max=sigma_max*10**-9;\n",
-    "\n",
-    "#result\n",
-    "print('Cohesive strength of a silica fiber = %g GPa')%(sigma_max);"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Example 7.2, Fracture Stress, Page No. 246"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 2,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "Fracture Stress = 100 MPa\n"
-     ]
-    }
-   ],
-   "source": [
-    "from math import sqrt\n",
-    "\n",
-    "#variable declaration\n",
-    "E=100;\n",
-    "E=E*10**9;\n",
-    "Ys=1;\n",
-    "a0=2.5*10**-10;\n",
-    "c=10**4*a0;\n",
-    "\n",
-    "#calculation\n",
-    "sigma_f=sqrt(E*Ys/(4*c));\n",
-    "sigma_f=sigma_f*10**-6;\n",
-    "\n",
-    "#result\n",
-    "print('Fracture Stress = %g MPa')%(sigma_f);"
-   ]
-  }
- ],
- "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
-}