Base ball deformation study using explicit analysis
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Hope you are well. I need some guidance. I am performing explicit analyse on base ball bat and base ball. But I am unable ball is also not moving forward to the bat. Please guide me with the steps. It would be great help. I was following time integration lesson of ansys, but this simulation is not sloved completly thats why i am having trouble following to replicate. Please guide thanks alot.
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For simulation bat is moving 10 degree for that i used remote displacement but the ball is stand still and results are also wrong. I guess because not interaction is there between ball and bat. below is snap shot.
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The reason the bat doesn't hit the ball is because it is rotating about the center of the yellow circle and you can see that the bat can't reach the ball. Even if you move the center of rotation to the end of the bat handle, it still won't reach the ball. You will have to move the center of rotation even further to the right so that a circle will reach the ball.Â
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Even if you move the rotation of the bat to a coordinate that is 2000 mm, a 10 degree angle is insufficient to reach the ball.
Fix those two problems and the bat will hit the ball.
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Click on the Remote Displacement, and change the Z coordinate to -2000 mm or 2 m depending on your current units setting. Change the 10 degrees to 20 degrees.
If you want to see the ball get struck by the bat, click on Analysis Settings and in the Output Controls section, change the Result Number of Points to 1000 then Solve.
On the Animation player control, click on the Result Set button (red circle), then click Play.
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The ball is moving forward at 10 mm/s. Change your Units to meters and type in 10 and Solve.
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You opened a material that only has experimental data. This material is used for learning to fit hyperelastic material constants to experimental data. It is not a material that is ready to use.Â
If you want to find a material that provides the material constants, use the Explicit Materials data source, scroll down to Rubber 2 and click the + sign to add it to your model.
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Wasn't that fun!
The ball smashed because the Erosion Control setting for Explicit Dynamics was set to remove elements that had a Geometric Strain value greater than 1.5. Change the Yes to a No and that won't happen.
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Note that when you changed 10 degrees of rotation to 20 degrees, you doubled the velocity of the bat.
Use the Body filter and select the ball then insert a result Deformation > Directional Velocity. Set the direction to the Y axis.
Here is a post about Contact Force vs Time.Â
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The contact force looks much better with a stiffer rubber.
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I increased Material Constant C10 by a factor of 100.
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I don't know which part of the course you are trying to replicate.
Deformation is the distance of the node from its initial position to its current position. Wait a second and the deformation will be measured in meters!
During the impact of the ball and the bat, you can measure the deformation of the ball relative to itself by plotting Strain instead of Deformation. The strain of the ball is zero as it flys toward the bat, though the deformation of the ball is increasing.
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The best way to learn is to keep building different models.Â
Read the Autodyn User's Manual in the ANSYS Help system for more information.
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/wb_adyn/wb_adyn.htmlRead this topic about meshing for Explicit Dynamics.
I changed the Z coordinate of the Remote Displacement to make the bat swing about a center that would reach the ball.
Good Luck!
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