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| author | hardythe1 | 2015-04-07 15:58:05 +0530 |
|---|---|---|
| committer | hardythe1 | 2015-04-07 15:58:05 +0530 |
| commit | 92cca121f959c6616e3da431c1e2d23c4fa5e886 (patch) | |
| tree | 205e68d0ce598ac5caca7de839a2934d746cce86 /Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb | |
| parent | b14c13fcc6bb6d01c468805d612acb353ec168ac (diff) | |
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Diffstat (limited to 'Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb')
| -rwxr-xr-x | Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb b/Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb new file mode 100755 index 00000000..a849c8c6 --- /dev/null +++ b/Aircraft_Structures_for_Engineering_Students/Chapter15.ipynb @@ -0,0 +1,76 @@ +{
+ "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": {}
+ }
+ ]
+}
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