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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
cross-section 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 X-axis
as neutral axis (i.e. in the plane of motion of the connecting rod) or Y-axis 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 X-axis and both ends fixed for buckling about Y-axis.
A connecting rod should be equally strong in buckling about both the axes.
A = Cross-sectional 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 X-axis and Y -axis
kxx and kyy = Radius of gyration of the section about X -axis and Y - axis
According to Ra...
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- Spring '11