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"source": [
"Chapter1-Tensile Strength"
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"source": [
"Ex2-pg13"
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"input": [
"import math\n",
"#calculate the \n",
"print('MACHINE DESIGN \\n Timothy H. Wentzell, P.E. \\n EXAMPLE-1.2 Page 13 ') \n",
"##Example 1.2\n",
"\n",
"Sy=61000. ##[psi] Tensile strength of AISI 1020 cold drawn steel from Appendix 4 Page no 470\n",
"SF=2.; ##[] safety factor\n",
"F=300.; ##[lb] Weight of the ball\n",
"L=36.; ##[in] Length of round bar\n",
"Sy=61000.; ##[psi] Tensile strength from Appendix 4\n",
"M=F*L; ##[in*lb] Bending moment Appendix 2\n",
"\n",
"Sall=Sy/SF; ##[psi] Allowable stress \n",
"Z=M/Sall; ##[in^3] Section modulus for bending Sall=M/Z\n",
"D=(32.*Z/math.pi)**(1./3.); ##[in] Diameter of bar\n",
"\n",
"##Use 13/8 in bar\n",
"D1=1.625;\n",
"\n",
"print'%s %.2f %s '%('\\n\\n Diameter of Bar is ',D1,' in');\n",
"\n",
"##Checking Deflection\n",
"I=math.pi*D1**4/64.; ##[in^4] Moment of inertia Appendix 3\n",
"E=30.*10**6.; ##[lb/in^2] Modulus of elasticity\n",
"Delta=F*L**3./(3.*E*I); ##[in] Deflection \n",
"\n",
"##Note- In the book I=0.342 in^4 is used instead of I=0.3422814 in^4\n",
"\n",
"print'%s %.2f %s '%('\\n The deflection of bar is',Delta,' in');\n",
"\n",
"\n",
"##Note: The deviation of answer from the answer given in the book is due to round off error.(In the book values are rounded while in scilab actual values are taken)\n"
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"MACHINE DESIGN \n",
" Timothy H. Wentzell, P.E. \n",
" EXAMPLE-1.2 Page 13 \n",
"\n",
"\n",
" Diameter of Bar is 1.62 in \n",
"\n",
" The deflection of bar is 0.45 in \n"
]
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|
