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{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "heading",
"level": 1,
"metadata": {},
"source": [
"Chapter 11: Mechanical Properties"
]
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
" Example 11.1, page no-332"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# Stress produced in an Al\n",
"\n",
"import math\n",
"#Variable Declaration\n",
"ld=2000.0 # Load applied\n",
"g=9.8 # Acceleration due to gravity in m/s^2\n",
"r=0.005 # radious of test piece\n",
"\n",
"#Calculation\n",
"force=ld*g\n",
"stress= force/(math.pi*r**2)\n",
"\n",
"#Result\n",
"print('The stress produce in an aluminium alloy is %.1f MPa'%(stress*10**-6))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The stress produce in an aluminium alloy is 249.6 MPa\n"
]
}
],
"prompt_number": 3
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11.2, page no-332"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# perentage elongation and reduction\n",
"\n",
"import math\n",
"#Variable Declaration\n",
"lf=53.75*10**-3\n",
"l0=50*10**-3\n",
"df=9.4*10**-3\n",
"d0=8.8*10**-3\n",
"\n",
"#Calculation\n",
"pl=(lf-l0)*100.0/l0\n",
"pa=((math.pi*df**2)-(math.pi*d0**2))*100.0/(math.pi*df**2)\n",
"\n",
"#Result\n",
"print('\\nThe %% elongation is %.1f%% and \\nthe %% reduction in area is %.2f%%'%(pl,pa))"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"The % elongation is 7.5% and \n",
"the % reduction in area is 12.36%\n"
]
}
],
"prompt_number": 6
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11.3, page no-332"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Brinell Hardness Number\n",
"\n",
"import math\n",
"#Variable Declaration\n",
"ts=937.0 # Tensile strength of steel\n",
"\n",
"\n",
"#Calculation\n",
"bhn=ts/3.45\n",
"\n",
"#Result\n",
"print('The Brinell Hardness Number is %.2f'%bhn)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"The Brinell Hardness Number is 271.59\n"
]
}
],
"prompt_number": 7
},
{
"cell_type": "heading",
"level": 2,
"metadata": {},
"source": [
"Example 11.4, page no-333"
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"#Tensile strength and fatigue limit of Steel plate\n",
"\n",
"import math\n",
"#Variable Declaration\n",
"p=3000.0 # Load applied\n",
"D=10.0 # diameter of the indenter\n",
"d=2.2 # diameter of the impression\n",
"\n",
"#Calculation\n",
"Hb=2*p/(math.pi*D*(D-math.sqrt(D**2-d**2)))\n",
"Hb= math.floor(Hb*10)/10\n",
"ts=3.45*Hb\n",
"fl=0.5*ts\n",
"\n",
"#Result\n",
"print('\\nBrinell Hardness Number of steel Plate, Hb=%.1f\\n'%Hb)\n",
"print('\\nThe Tensile strength of steel plate is %.3f MPa\\n'%ts)\n",
"print('\\nThe Fatigue limit of steel plate is %.4f MPa'%fl)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"\n",
"Brinell Hardness Number of steel Plate, Hb=779.5\n",
"\n",
"\n",
"The Tensile strength of steel plate is 2689.275 MPa\n",
"\n",
"\n",
"The Fatigue limit of steel plate is 1344.6375 MPa\n"
]
}
],
"prompt_number": 12
}
],
"metadata": {}
}
]
}
|
