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Diffstat (limited to 'Machine_Design_by_U.C._Jindal/Ch31.ipynb')
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diff --git a/Machine_Design_by_U.C._Jindal/Ch31.ipynb b/Machine_Design_by_U.C._Jindal/Ch31.ipynb new file mode 100644 index 00000000..890e011d --- /dev/null +++ b/Machine_Design_by_U.C._Jindal/Ch31.ipynb @@ -0,0 +1,173 @@ +{ + "metadata": { + "name": "", + "signature": "sha256:6ec60a366eb75f6b61dc10de0b002b97629539c44f0f706f948844442706e9bd" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Ch:31 Seals packing and gaskets" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "exa 31-1 - Page 816" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "from __future__ import division\n", + "from math import sqrt, pi, log\n", + "d=18#\n", + "lg=25+25#\n", + "Eb=210*10**3#\n", + "Ecl=90*10**3#\n", + "A=pi*d**2/4#\n", + "kb=A*Eb/lg#\n", + "x=(5*(lg+(0.5*d))/(lg+(2.5*d)))#\n", + "km=pi*Ecl*d/(2*log(x))#\n", + "C=kb/(kb+km)#\n", + "sigp=600#\n", + "At=192#\n", + "Pi=0.75*sigp*At#\n", + "F=200#\n", + "C=0.322#\n", + "Pb=F*C*10**3#\n", + "FOS=2#\n", + "W=At*sigp#\n", + "N=Pb*FOS/(W-Pi)#\n", + "print \"N is %0.2f \"%(N)#" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "N is 4.47 \n" + ] + } + ], + "prompt_number": 1 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "exa 31-2 - Page 816" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "d=16#\n", + "D=1.5*d#\n", + "t=20#\n", + "tg=4#\n", + "#Let Gasket diameter in compression zone be d1\n", + "d1=D+(2*t)+tg#\n", + "lg=40#\n", + "E=207*10**3#\n", + "kb=pi*d**2*E/(lg*4)#\n", + "Ecl=90*10**3#\n", + "x=(5*(lg+(0.5*d))/(lg+(2.5*d)))#\n", + "kp=pi*Ecl*d/(2*log(x))#\n", + "Ag=pi*(d1**2-d**2)/4#\n", + "Eg=480#\n", + "kg=Ag*Eg/tg#\n", + "km=kg*kp/(kg+kp)#\n", + "C=kb/(kb+km)#\n", + "At=157#\n", + "sigp=600#\n", + "Pi=0.75*At*sigp/2#\n", + "FOS=2#\n", + "Pf=At*sigp/FOS#\n", + "W=Pf-Pi#\n", + "P=W/C#\n", + "N=5#\n", + "F=P*N#\n", + "p=F*4/(pi*120**2)#\n", + "print \"p is %0.3f N/mm**2 \"%(p)#" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "p is 6.922 N/mm**2 \n" + ] + } + ], + "prompt_number": 2 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "exa 31-3 - Page 817" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "sigp=600#\n", + "FOS=3#\n", + "siga=sigp/FOS#\n", + "d=16#\n", + "D=1.5*d+60#\n", + "#Let Gasket diameter in compression zone be d1\n", + "d1=(300-160)/2#\n", + "#Let compressive stress in gasket for leak proof joint be sigl\n", + "sigl=12#\n", + "from numpy import mat\n", + "At=mat([[1, 157],[2 ,192], [3, 245]])\n", + "d=mat([[1 ,16],[2 ,18],[3, 20]])\n", + "\n", + "n=3#\n", + "Pi = range(0,n)\n", + "Pc = range(0,n)\n", + "for i in range(0,n):\n", + " Pi[i]=At[i,1]*d[i,1]\n", + " Pc[i]=3*pi*(d1**2-d[i,1]**2)\n", + " if (Pi[i]>=Pc[i]):\n", + " print \"The Design is safe\"\n", + "\n", + "print \"d is %0.0f mm \"%(d[i,1])#" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "d is 20 mm \n" + ] + } + ], + "prompt_number": 3 + } + ], + "metadata": {} + } + ] +}
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