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-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:1bd6512f5b9ca8155cc1e9c3b04ad8207681499e095afaf4830a217017e989ea"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 15: Fatigue"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example 15.1 Pg.No.445"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "from __future__ import division\n",
-      "from scipy import integrate\n",
-      "from sympy import symbols\n",
-      "import math\n",
-      "\n",
-      "#eqn 15.30 K=S(pi*a)^1/2*alpha\n",
-      "S=175         #stress range (N/mm^2)\n",
-      "K=1708          #fracture toughness (n/mm^3/2)\n",
-      "alpha=1         #constant\n",
-      "n=4         #constant\n",
-      "C=40*10**-15      #rate of crack growth (mm/cycle)\n",
-      "ai=0.1            #initial crack length\n",
-      "\n",
-      "alpha_f=K**2/S**2/math.pi\n",
-      "\n",
-      "\n",
-      "Nf=2/C/(n-2)/(S*math.pi**0.5)**n*(1/ai**((n-2)/2)-1/alpha_f**((n-2)/2))\n",
-      "print \"Number of cycles to failure = %5.0f cycles\\n\"%(Nf)"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Number of cycles to failure = 26919 cycles\n",
-        "\n"
-       ]
-      }
-     ],
-     "prompt_number": 4
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [],
-     "language": "python",
-     "metadata": {},
-     "outputs": []
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file