Learning Forum

[kar.engg]

In explicit analysis, I am performing an analysis for shock effect in a grass cutting blade when it is hit by a stone.
I had modeled several cases with different gap distances between blade and stone. Input is rotational velocity.
And, I could find that as the gap decreases the reaction force increases. And at zero gap, the reaction force is the highest.
Is this approach correct. How does the gap decides the reaction force?

[peteroznewman]

Where are you measuring the reaction force?
Did you create Initital Conditions of rotational velocity?
Or does the blade start the simulation at rest and the rotational velocity ramps up from zero?
It would be helpful if you insert an image of the stone and blade.

[kar.engg]

The reaction force is being measured at the stone's fixed support BC.
Yes. Initial rotational velocity is given as 3200 rpm.
Meanwhile, I had finished the analysis with 0 mm,  0.02 mm, 0.04 mm, 0.06 mm gaps too. The variation is of the order as 1513 N, 1569 N, 1807 N, 1469 N respectively. The gap seems to be varying the result without any particular order.
Attached the image of the system for reference.