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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
+}