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hari0811

Drop_Test of ball

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I am trying to perform a simple drop test of ball on ground. (Both being Flexible and of same material (Steel)).
The initial gap between ball and ground is 5mm. but when i see the animation file, the ball bounces after ~4.72mm.
can some one please help me.

 

steel_ball.avi

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Change the material type to M2_PLAS JOHNS ZERIL (elasto plastic material) and run the analysis. Provide appropriate material properties so that a realistic behavior of the simulation can be achieved. 

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ok I will launch using elasto plastic material and update you.
But i am wondering how will that effect the physics of my problem. The ball should touch the other part and it should bounce back.
 

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Material properties plays a vital role in simulation.

The input parameters will define the weight of the component. So input a reasonable value of E and rho.

Please update after the run.

 

 

cont.PNG

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Model the ground with elasto plastic material and run the analysis. Update it with the Plas Johns Zeril material.

.

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Hi George

I have solved the problem, The problem was in GAPmin which was taking a default value because of which it was not coming into contact.

Now i have a new problem which is drop in energy when the ball contacts with ground. ( My ground and Ball are flexible)

Do you know why such thing happens ?

 

 

Energy.png

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Hi Hari,

 

Can you check if there is any change in the KE

Usually if the collision is a plastic collision there will be considerable KE loss due to plastic deformation.

 

Also, total energy doesn't account for hourglass energy. So you may also have to check hour glass and contact energies.

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Hello Prakash

 

I am using Elastic model hence plastic deformation is not the problem,
I just checked the contact energy, it has some energy which is the drop in energy.

Total Energy = sum of internal energy +  kinetic energy + external force work - Contact energy - hourglass energy - internal spring energy ?
 

Is my understanding is correct ?

KE.png

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