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diff --git a/Test/chapter1_1.ipynb b/Test/chapter1_1.ipynb new file mode 100755 index 00000000..cf45a409 --- /dev/null +++ b/Test/chapter1_1.ipynb @@ -0,0 +1,423 @@ +{ + "metadata": { + "name": "" + }, + "nbformat": 3, + "nbformat_minor": 0, + "worksheets": [ + { + "cells": [ + { + "cell_type": "heading", + "level": 1, + "metadata": {}, + "source": [ + "Chapter 1: Tension Comprssion and Shear" + ] + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.1, page no. 9" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "Find compressive stress and strain in the post\n", + "\"\"\"\n", + "\n", + "import math\n", + "\n", + "#initialisation\n", + "\n", + "d_1 = 4 # inner diameter (inch)\n", + "d_2 = 4.5 #outer diameter (inch)\n", + "P = 26000 # pressure in pound\n", + "L = 16 # Length of cylinder (inch)\n", + "my_del = 0.012 # shortening of post (inch)\n", + "\n", + "#calculation\n", + "A = (math.pi/4)*((d_2**2)-(d_1**2)) #Area (inch^2)\n", + "s = P/A # stress\n", + "\n", + "print \"compressive stress in the post is \", round(s), \"psi\"\n", + "\n", + "e = my_del/L # strain\n", + "\n", + "print \"compressive strain in the post is %e\" %e" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "compressive stress in the post is 7789.0 psi\n", + "compressive strain in the post is 7.500000e-04\n" + ] + } + ], + "prompt_number": 5 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.2, page no. 10" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "formula for maximum stress & calculating maximum stress\n", + "\"\"\"\n", + "\n", + "import math \n", + "\n", + "#initialisation\n", + "W = 1500 # weight (Newton)\n", + "d = 0.008 #diameter(meter) \n", + "g = 77000 # Weight density of steel\n", + "L = 40 # Length of bar (m)\n", + "\n", + "#calculation\n", + "\n", + "A = (math.pi/4)*(d**2) # Area\n", + "s_max = (1500/A) + (g*L) # maximum stress\n", + "\n", + "#result\n", + "print \"Therefore the maximum stress in the rod is \", round(s_max,1), \"Pa\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Therefore the maximum stress in the rod is 32921551.8 Pa\n" + ] + } + ], + "prompt_number": 16 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.3. page no. 26" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "calculating change in lenght of pipe, strain in pipe, increase in diameter & increase in wall thickness\n", + "\"\"\"\n", + "\n", + "import math \n", + "\n", + "#initialisation\n", + "d1 = 4.5 # diameter in inch\n", + "d2 = 6 # diameter in inch\n", + "A = (math.pi/4)*((d2**2)-(d1**2)) # Area\n", + "P = 140 # pressure in K\n", + "s = -P/A # stress (compression)\n", + "E = 30000 # young's modulus in Ksi\n", + "e = s/E # strain\n", + "\n", + "#calculation\n", + "\n", + "# Part (a)\n", + "my_del = e*4*12 # del = e*L \n", + "print \"Change in length of the pipe is\", round(my_del,3), \"inch\"\n", + "\n", + "# Part (b)\n", + "v = 0.30 # Poissio's ratio\n", + "e_ = -(v*e)\n", + "print \"Lateral strain in the pipe is %e\" %e_\n", + "\n", + "# Part (c)\n", + "del_d2 = e_*d2 \n", + "del_d1 = e_*d1\n", + "print \"Increase in the inner diameter is \", round(del_d1,6), \"inch\"\n", + "\n", + "# Part (d)\n", + "t = 0.75\n", + "del_t = e_*t\n", + "print \"Increase in the wall thicness is %f\" %del_t, \"inch\"\n", + "del_t1 = (del_d2-del_d1)/2 \n", + "print \"del_t1 = del_t\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Change in length of the pipe is -0.018 inch\n", + "Lateral strain in the pipe is 1.131768e-04\n", + "Increase in the inner diameter is 0.000509 inch\n", + "Increase in the wall thicness is 0.000085 inch\n", + "del_t1 = del_t\n" + ] + } + ], + "prompt_number": 7 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.4, page no. 35" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "calculate average shear stress and compressive stress\n", + "\"\"\"\n", + "\n", + "import math \n", + "\n", + "#initialisation\n", + "d = 0.02 # diameter in m\n", + "t = 0.008 # thickness in m\n", + "A = math.pi*d*t # shear area\n", + "P = 110000 # prassure in Newton\n", + "\n", + "#calculation\n", + "A1 = (math.pi/4)*(d**2) # Punch area\n", + "t_aver = P/A # Average shear stress \n", + "\n", + "\n", + "print \"Average shear stress in the plate is \", t_aver, \"Pa\"\n", + "s_c = P/A1 # compressive stress\n", + "print \"Average compressive stress in the plate is \", s_c, \"Pa\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Average shear stress in the plate is 218838046.751 Pa\n", + "Average compressive stress in the plate is 350140874.802 Pa\n" + ] + } + ], + "prompt_number": 37 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Eample 1.5, page no. 36" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "calculate bearing stress, shear stress in pin,\n", + "bearing stress between pin and gussets,\n", + "shear stress in anchor bolts\n", + "\"\"\"\n", + "\n", + "import math \n", + "\n", + "#initialisation\n", + "\n", + "P = 12.0 # Pressure in K\n", + "t = 0.375 # thickness of wall in inch\n", + "theta = 40.0 # angle in degree\n", + "d_pin = 0.75 # diameter of pin in inch\n", + "t_G = 0.625 # thickness of gusset in inch\n", + "t_B = 0.375 #thickness of base plate in inch\n", + "d_b = 0.50 # diameter of bolt in inch\n", + "\n", + "#calculation\n", + "\n", + "#Part (a)\n", + "s_b1 = P/(2*t*d_pin) # bearing stress\n", + "print \"Bearing stress between strut and pin\", round(s_b1,1), \"ksi\"\n", + "\n", + "#Part (b)\n", + "t_pin = (4*P)/(2*math.pi*(d_pin**2)) # average shear stress in the \n", + "print \"Shear stress in pin is \", round(t_pin,1), \"ksi\"\n", + "\n", + "# Part (c)\n", + "s_b2 = P/(2*t_G*d_pin) # bearing stress between pin and gusset\n", + "print \"Bearing stress between pin and gussets is\", s_b2, \"ksi\"\n", + "\n", + "# Part (d)\n", + "s_b3 = (P*math.cos(math.radians(40))/(4*t_B*d_b)) # bearing stress between anchor bolt and base plate\n", + "print \"Bearing stress between anchor bolts & base plate\", round(s_b3,1), \"ksi\"\n", + "\n", + "# Part (e)\n", + "t_bolt = (4*math.cos(math.radians(40))*P)/(4*math.pi*(d_b**2)) # shear stress in anchor bolt\n", + "print \"Shear stress in anchor bolts is\", round(t_bolt,1), \"ksi\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Bearing stress between strut and pin 21.3 ksi\n", + "Shear stress in pin is 13.6 ksi\n", + "Bearing stress between pin and gussets is 12.8 ksi\n", + "Bearing stress between anchor bolts & base plate 12.3 ksi\n", + "Shear stress in anchor bolts is 11.7 ksi\n" + ] + } + ], + "prompt_number": 39 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.7, page no. 42" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "determine stress at various parts\n", + "\"\"\"\n", + "\n", + "import math\n", + "\n", + "#initialisation\n", + "b1 = 1.5 # width of recmath.tangular crosssection in inch\n", + "t = 0.5 # thickness of recmath.tangular crosssection in inch\n", + "b2 = 3.0 # width of enlarged recmath.tangular crosssection in inch\n", + "d = 1.0 # diameter in inch\n", + "\n", + "#calculation\n", + "\n", + "# Part (a)\n", + "s_1 = 16000 # maximum allowable tensile stress in Psi\n", + "P_1 = s_1*t*b1 \n", + "print \"The allowable load P1 is\", P_1, \"lb\"\n", + "\n", + "# Part (b)\n", + "s_2 = 11000 # maximum allowable tensile stress in Psi\n", + "P_2 = s_2*t*(b2-d) \n", + "print \"allowable load P2 at this section is\", P_2, \"lb\"\n", + "\n", + "#Part (c)\n", + "s_3 = 26000 # maximum allowable tensile stress in Psi\n", + "P_3 = s_3*t*d \n", + "print \"The allowable load based upon bearing between the hanger and the bolt is\", P_3, \"lb\"\n", + "\n", + "# Part (d)\n", + "s_4 = 6500 # maximum allowable tensile stress in Psi\n", + "P_4 = (math.pi/4)*(d**2)*2*s_4 \n", + "print \"the allowable load P4 based upon shear in the bolt is\", round(P_4), \"lb\"\n" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "The allowable load P1 is 12000.0 lb\n", + "allowable load P2 at this section is 11000.0 lb\n", + "The allowable load based upon bearing between the hanger and the bolt is 13000.0 lb\n", + "the allowable load P4 based upon shear in the bolt is 10210.0 lb\n" + ] + } + ], + "prompt_number": 42 + }, + { + "cell_type": "heading", + "level": 2, + "metadata": {}, + "source": [ + "Example 1.8, page no. 46" + ] + }, + { + "cell_type": "code", + "collapsed": false, + "input": [ + "\"\"\"\n", + "calculating the cross sectional area \n", + "\"\"\"\n", + "\n", + "import math \n", + "\n", + "#initialisation\n", + "R_ah = (2700*0.8 + 2700*2.6)/2 # Horizontal component at A in N\n", + "R_ch = R_ah # Horizontal component at C in N\n", + "R_cv = (2700*2.2 + 2700*0.4)/3 # vertical component at C in N\n", + "R_av = 2700 + 2700 - R_cv # vertical component at A in N\n", + "R_a = math.sqrt((R_ah**2)+(R_av**2))\n", + "R_c = math.sqrt((R_ch**2)+(R_cv**2))\n", + "Fab = R_a # Tensile force in bar AB\n", + "Vc = R_c # Shear force acting on the pin at C\n", + "s_allow = 125000000 # allowable stress in tension \n", + "t_allow = 45000000 # allowable stress in shear\n", + "\n", + "#calculation\n", + "Aab = Fab / s_allow # required area of bar \n", + "Apin = Vc / (2*t_allow) # required area of pin\n", + "\n", + "\n", + "print \"Required area of bar is %f\" %Apin, \"m^2\"\n", + "d = math.sqrt((4*Apin)/math.pi) # diameter in meter\n", + "print \"Required diameter of pin is %f\" %d, \"m\"" + ], + "language": "python", + "metadata": {}, + "outputs": [ + { + "output_type": "stream", + "stream": "stdout", + "text": [ + "Required area of bar is 0.000057 m^2\n", + "Required diameter of pin is 0.008537 m\n" + ] + } + ], + "prompt_number": 9 + }, + { + "cell_type": "code", + "collapsed": false, + "input": [], + "language": "python", + "metadata": {}, + "outputs": [] + } + ], + "metadata": {} + } + ] +}
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