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Unformatted text preview: machine member which is subjected to alternating direct compressive and
tensile forces. Since the compressive forces are much higher than the tensile forces, therefore, the
crosssection of the connecting rod is designed as a strut and the Rankine’s formula is used.
A connecting rod, as shown in Fig. 32.12, subjected to an axial load W may buckle with Xaxis
as neutral axis (i.e. in the plane of motion of the connecting rod) or Yaxis as neutral axis (i.e. in the
plane perpendicular to the plane of motion). The connecting rod is considered like both ends hinged
for buckling about Xaxis and both ends fixed for buckling about Yaxis.
A connecting rod should be equally strong in buckling about both the axes.
Let
A = Crosssectional area of the connecting rod,
l = Length of the connecting rod,
σc = Compressive yield stress,
WB = Buckling load,
Ixx and Iyy = Moment of inertia of the section about Xaxis and Y axis
respectively, and
kxx and kyy = Radius of gyration of the section about X axis and Y  axis
respectively.
According to Ra...
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 Spring '11
 A.thirumoorthy
 Combustion

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