1 files changed, 82 insertions, 0 deletions
diff --git a/Aircraft_Structures_for_Engineering_Students/Chapter26.ipynb b/Aircraft_Structures_for_Engineering_Students/Chapter26.ipynb
new file mode 100755
index 00000000..994182d0
--- /dev/null
+++ b/Aircraft_Structures_for_Engineering_Students/Chapter26.ipynb
@@ -0,0 +1,82 @@
+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:eb3a8ca85b2b3516ec190a12a8401ddf32d140498cd023be9bda6228b1754025"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 26: Closed Section Beams"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example 26.3 Pg.No.693"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "from __future__ import division\n",
+      "from sympy import solve, symbols\n",
+      "import math\n",
+      "\n",
+      "\n",
+      "G=20000               #shear modulus (N/mm^2)\n",
+      "E=G/0.36              #young's modulus\n",
+      "tau=20                #torque (Nm/mm)\n",
+      "t=1\n",
+      "b=200\n",
+      "a=500\n",
+      "L=2500\n",
+      "A=800\n",
+      "\n",
+      "#torque at each support \n",
+      "T=20*5000/2\n",
+      "\n",
+      "mu=math.sqrt(8*G*t/(A*E*(b+a)))\n",
+      "\n",
+      "z=2500\n",
+      "F=-1.95/mu*math.cosh(mu*z)+1.75*z**2\n",
+      "\n",
+      "z=0                            # at mid-span z=0\n",
+      "theta=10**(-8)*(1.95/mu*math.cosh(mu*z)-1.75*z**2+F)\n",
+      "print \"twist at mid-span = %1.3f rad = %1.2f degree\"%(theta,theta*180/math.pi)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "twist at mid-span = 0.108 rad = 6.20 degree\n"
+       ]
+      }
+     ],
+     "prompt_number": 13
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file