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| author | priyanka | 2015-06-24 15:03:17 +0530 |
|---|---|---|
| committer | priyanka | 2015-06-24 15:03:17 +0530 |
| commit | b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b (patch) | |
| tree | ab291cffc65280e58ac82470ba63fbcca7805165 /764/CH4/EX4.18.b | |
| download | Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.gz Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.tar.bz2 Scilab-TBC-Uploads-b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b.zip | |
initial commit / add all books
Diffstat (limited to '764/CH4/EX4.18.b')
| -rwxr-xr-x | 764/CH4/EX4.18.b/result4_18.txt | 94 | ||||
| -rwxr-xr-x | 764/CH4/EX4.18.b/solution4_18.sce | 81 |
2 files changed, 175 insertions, 0 deletions
diff --git a/764/CH4/EX4.18.b/result4_18.txt b/764/CH4/EX4.18.b/result4_18.txt new file mode 100755 index 000000000..2579a2ab0 --- /dev/null +++ b/764/CH4/EX4.18.b/result4_18.txt @@ -0,0 +1,94 @@ +-->//(Design against Static Load) Example 4.18
+
+-->//Refer Fig.4.57 on page 126
+
+-->//Tensile yield strength of FeE250 Syt (N/mm2)
+
+-->Syt = 250
+ Syt =
+
+ 250.
+
+-->//Factor of safety fs
+
+-->fs = 5
+ fs =
+
+ 5.
+
+-->//Diameter of bars to be sheared D (mm)
+
+-->D = 6.25
+ D =
+
+ 6.25
+
+-->//Ultimate shear strength of the material Sus (N/mm2)
+
+-->Sus = 350
+ Sus =
+
+ 350.
+
+-->//Permissible bearing pressure on the pins p (N/mm2)
+
+-->p = 10
+ p =
+
+ 10.
+
+-->//Pin length to diameter ratio r1
+
+-->r1 = 1.25
+ r1 =
+
+ 1.25
+
+-->//Link cross-section width to thickness ratio r2
+
+-->r2 = 2
+ r2 =
+
+ 2.
+
+-->//Distance between pinA and pinB l1 (mm)
+
+-->l4 = 400
+ l4 =
+
+ 400.
+
+-->//Distance between bar to be sheared and pinA & force application point and pinC l2 (mm)
+
+-->l2 = 100
+ l2 =
+
+ 100.
+
+-->//Distance between the force applied and pinD l3 (mm)
+
+-->l3 = 1000
+ l3 =
+
+ 1000.
+
+-->//Thickness of gunmetal bush over pin C t (mm)
+
+-->t = 2.5
+ t =
+
+ 2.5
+
+
+Diameter of pins(d1) = 15.000000 mm
+
+Length of pins(l1) = 20.000000 mm
+
+Diameter of link(d) = 10.000000 mm
+
+Width of lever cross-section(h) = 40.000000 mm
+
+Thickness of lever cross-section(b) = 20.000000 mm
+
+The design is safe
+
\ No newline at end of file diff --git a/764/CH4/EX4.18.b/solution4_18.sce b/764/CH4/EX4.18.b/solution4_18.sce new file mode 100755 index 000000000..aecb236f9 --- /dev/null +++ b/764/CH4/EX4.18.b/solution4_18.sce @@ -0,0 +1,81 @@ +
+//Function to round-up a value such that it is divisible by 5
+function[v] = round_five(w)
+ v = ceil(w)
+ rem = pmodulo(v,5)
+ if (rem ~= 0) then
+ v = v + (5 - rem)
+ end
+endfunction
+
+//Obtain path of solution file
+path = get_absolute_file_path('solution4_18.sce')
+//Obtain path of data file
+datapath = path + filesep() + 'data4_18.sci'
+//Clear all
+clc
+//Execute the data file
+exec(datapath)
+//Calculate permissible stresses
+//Permissible tensile stress sigmat (N/mm2)
+sigmat = Syt/fs
+//Calculate the yield strength in shear Ssy (N/mm2)
+Ssy = (50/100)*Syt
+//Calculate the permissible stress in shear tau (N/mm2)
+tau = Ssy/fs
+//Maximum force required to shear the bar Ps (N)
+Ps = (%pi/4)*(D^2)*Sus
+//Calculate the force acting on each pin P1 (N)
+P1 = (Ps * l2)/l4
+//Calculate reaction at pinA RA (N)
+RA = Ps - P1
+//Calculate the force applied at lever P (N)
+P = (P1 * l2)/l3
+//Calculate reaction at pinD RD (N)
+RD = P1 - P
+//Calculate the diameter of pins d1 (mm)
+d1 = (P1/(p * r1))^(1/2)
+d1 = round_five(d1)
+//Calculate the length of pin l1 (mm)
+l1 = r1 * d1
+l1 = round_five(l1)
+//Calculate the shear stress in pin tau1 (N/mm2)
+tau1 = (P1 * 4)/(2 * %pi * (d1^2))
+//Calculate the diameter of the link d (mm)
+d = ((P1 * 4)/(%pi * sigmat))^(1/2)
+d = round_five(d)
+//Calculate the maximum bending moment on lever Mb (N-mm)
+Mb = P * (l3 - l2)
+//Assume the thickness of the cross-section to be 1mm b
+b = 1
+//Calculate the width of the cross-section h (mm)
+h = r2 * b
+//Calculate the value of y (mm)
+y = h/2
+//Calculate the second moment of area I (mm4)
+I = (b * ((r2 * b)^3))/12
+//Calculate the true value of b (mm)
+b = ((Mb * y)/(sigmat * I))^(1/3)
+b = round_five(b)
+//Calculate the true value of h (mm)
+h = r2 * b
+//Calculate the inner diameter of the boss di (mm)
+di = d1 + (2 * t)
+//Calculate the outer diameter of the boss d0 (mm)
+d0 = 2 * di
+//Calculate the second moment of area I1 (mm4)
+I1 = ((l1 * (d0^3)) - (l1 * (di^3)))/12
+//Calculate y1 (mm)
+y1 = d0/2
+//Calculate the bending stress B (N/mm2)
+B = (Mb * y1)/I1
+//Print results
+printf('\nDiameter of pins(d1) = %f mm\n',d1)
+printf('\nLength of pins(l1) = %f mm\n',l1)
+printf('\nDiameter of link(d) = %f mm\n',d)
+printf('\nWidth of lever cross-section(h) = %f mm\n',h)
+printf('\nThickness of lever cross-section(b) = %f mm\n',b)
+//Chech design
+if((tau1 < tau) & (B - sigmat)<2)
+ printf('\nThe design is safe\n')
+end
\ No newline at end of file |