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diff --git a/Advanced_Strength_and_Applied_Elasticity/Chapter12.ipynb b/Advanced_Strength_and_Applied_Elasticity/Chapter12.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:2781545e4a86c16cb74b3bfc3908d3f7649eaff2f44e3b1448ebf17923520f6f"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter12-Plastic Behaviour of Solids"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg345"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "import math\n",
+      "#calculate plastic yeilding and max allowable stress and axial stress and transverse stress and total elonganation for stability in meter\n",
+      "alpha=45.\n",
+      "sigmayp=35.*10**6 ##Pa\n",
+      "k=840.##MPa\n",
+      "n=0.2\n",
+      "L0=3 ##m\n",
+      "Aad=10.*10**-5 ##m**2\n",
+      "Acd=10.*10**-5 ##m**2\n",
+      "Abd=15.*10**-5 ##m**2\n",
+      "\n",
+      "P=sigmayp*Abd+2.*sigmayp*Aad*math.cos(45/57.3)\n",
+      "print'%s %.2f %s'%(\"plastic yeilding in N is= \",P,\"\")\n",
+      "sigma=k*n**n\n",
+      "print'%s %.2f %s'%(\"maxi allowable stress in MPa is= \",sigma,\"\")\n",
+      "epsilon1=n\n",
+      "print'%s %.2f %s'%(\"axial stress is= \",epsilon1,\"\")\n",
+      "epsilon2=-0.1\n",
+      "print'%s %.2f %s'%(\"transverse stress is= \",epsilon2,\"\")\n",
+      "epsilon3=-0.1\n",
+      "print'%s %.2f %s'%(\"transverse stress is= \",epsilon3,\"\")\n",
+      "z=3*n\n",
+      "print'%s %.2f %s'%(\"total elongation for stability in meter is= \",z,\"\")\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "plastic yeilding in N is=  10200.03 \n",
+        "maxi allowable stress in MPa is=  608.81 \n",
+        "axial stress is=  0.20 \n",
+        "transverse stress is=  -0.10 \n",
+        "transverse stress is=  -0.10 \n",
+        "total elongation for stability in meter is=  0.60 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file