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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
+}