Machine Design
A connecting rod subjected to an axial load may buckle with

X-axis as neutral axis
X-axis or Y-axis as neutral axis
Z-axis
Y-axis as neutral axis

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Machine Design
The ends of the leaves of a semi-elliptical leaf spring are made triangular in order to

Have variable bending moment (M) in each leaf
Make M/I constant throughout the length of the leaf
Obtain variable moment of inertia (I) in each leaf
Permit each leaf to act as an overhanging beam

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