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-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "# Chapter 18: Extrusion"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "### Example 18.1, Extrusion Process, Page No. 629"
-   ]
-  },
-  {
-   "cell_type": "code",
-   "execution_count": 1,
-   "metadata": {
-    "collapsed": false
-   },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "\n",
-      "Force required for the Operation = 3827.95 metric tons\n",
-      "\n",
-      "\n",
-      "Note: Slight calculation errors in book\n"
-     ]
-    }
-   ],
-   "source": [
-    "from math import log\n",
-    "from math import radians\n",
-    "from math import tan\n",
-    "from math import sqrt\n",
-    "from math import pi\n",
-    "\n",
-    "#variable declaration\n",
-    "def cot(x):\n",
-    "    return 1/tan(x);\n",
-    "Db=6;\n",
-    "Df=2;\n",
-    "L=15;\n",
-    "v=2;\n",
-    "alpha=60;\n",
-    "mu=0.1;\n",
-    "\n",
-    "#calculations\n",
-    "R=Db**2/Df**2;\n",
-    "e=6*v*log(R)/Db\n",
-    "sigma=200*e**0.15;\n",
-    "alpha=radians(alpha);\n",
-    "B=mu*cot(alpha);\n",
-    "p_d=sigma*((1+B)/B)*(1-R**B);\n",
-    "p_d=abs(p_d);\n",
-    "t_i=sigma/sqrt(3);\n",
-    "p_e=p_d+4*t_i*L/Db;\n",
-    "p_e=p_e*145.0377;                    #conversion to psi\n",
-    "A=pi*Db**2/4;\n",
-    "P=p_e*A;\n",
-    "P=P*0.000453;                      #conversion to metric tons\n",
-    "\n",
-    "#result\n",
-    "print('\\nForce required for the Operation = %g metric tons\\n\\n\\nNote: Slight calculation errors in book')%(P);"
-   ]
-  }
- ],
- "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
-}