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-->//(Threaded Joints) Example 7.20
-->//Number of bolts N
-->N = 2
N =
2.
-->//Engine speed n (rpm)
-->n = 2000
n =
2000.
-->//Length of stroke l (mm)
-->l = 100
l =
100.
-->//Length of connecting rod c (mm)
-->c = 200
c =
200.
-->//Mass of reciprocating parts m (kg)
-->m = 5
m =
5.
-->//Overload percentage load (%)
-->load = 50
load =
50.
-->//Assume the stiffness of the bolts to be 1N/mm kb
-->kb = 1
kb =
1.
-->//Calculate the stiffness of the parts kc
-->kc = 4 * kb
kc =
4.
-->//Yield tensile strength of chromium-molybdenum steel Syt (N/mm2)
-->Syt = 450
Syt =
450.
-->//Ultimate tensile strength of chromium-molybdenum steel Sut (N/mm2)
-->Sut = 600
Sut =
600.
-->//Fatigue stress concentration factor Kf
-->Kf = 3.0
Kf =
3.
-->//Expected reliability (%)
-->reliability = 90
reliability =
90.
-->//Factor of safety fs
-->fs = 2
fs =
2.
-->//Assume diameter of the bolt to be less than 7.5mm for Kb to be 1
-->d = 1
d =
1.
-->//As Ka is incorporated into Kf, assume the assembly to be ground
-->//This is just to obtain a random value of Ka
-->op = 1
op =
1.
-->//Inclination of connecting rod to the line of stroke theta (degree)
-->theta = 0
theta =
0.
Core cross-section area of the bolt(A) = 38.128117 mm2
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