Discussion
During field operation, the shank of a tractor drawn rigid tyne sweep type cultivator is mainly subjected to
Answer: A
The shank is mainly subjected to bending.
A rigid tyne is a cantilever clamped to the tool frame. The soil resistance acts on the sweep at its lower end, well below the clamp, so the horizontal draft force produces a large bending moment that grows towards the clamp. This is why tyne shanks are designed on bending stress and are deep in the direction of travel.
Direct shear from the same force is small beside that moment. Torsion arises only if the soil force is off the shank's centre line, which a symmetrical sweep largely avoids, so neither torsion alone nor bending and torsion together is the main loading.
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