I am trying to model an energy dissipater element that can undergo plastic deformation when contacted by a body, e.g. elastic perfectly plastic relationship

MTV over 1 year ago

I have tried using a sensor as described in Article Number

000002688:

What I have so far:

-----------------------

Sensor event definition

.MODEL_1.Deformation - SENVAL(DeformationSensor)

Sensor event evaluation:

.MODEL_1.Deformation

SForce:

IF( .MODEL_1.Deformation: forceValue, 0, 0 )

Questions:

-------------

I am finding it difficult to figure out how to incorporate the plastic deformation. According to me plasticDeformation = SENVAL(DeformationSensor) therefore the force becomes (where force value: f= min(kx, plasticForceValue):

IF( .MODEL_1.Deformation + plasticDeformation: forceValue, 0, 0 ) but this is obviously incomplete and incorrect.

Is the sensor approach correct for this application, or do I need to look at doing a subroutine? Is there another approach that will work?

Parents

0 MTV over 1 year ago

Hi JSlat

Sorry I have taken so long to get back. I have been working on another project and only got back to this recently.

Thank you very much for the demo model and explanation. I have been playing with your ElastoPlast model to gain a better understanding of how it works. If I remove the driver and spring damper and apply a 2 stage step motion directly to the stamper, as well as set gravity to along +x. This modified model has a high frequency force and some strange behaviour in the elastic component of the Ground_Force element. It almost looks like the surface element is bouncing on the elastic force, but I have not been able to completely confirm this yet. For now, I am planning to add damping to the elastic force only and see if it damps out the high frequency vibrations.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Reply

0 MTV over 1 year ago

Hi JSlat

Sorry I have taken so long to get back. I have been working on another project and only got back to this recently.

Thank you very much for the demo model and explanation. I have been playing with your ElastoPlast model to gain a better understanding of how it works. If I remove the driver and spring damper and apply a 2 stage step motion directly to the stamper, as well as set gravity to along +x. This modified model has a high frequency force and some strange behaviour in the elastic component of the Ground_Force element. It almost looks like the surface element is bouncing on the elastic force, but I have not been able to completely confirm this yet. For now, I am planning to add damping to the elastic force only and see if it damps out the high frequency vibrations.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Verify Answer

Cancel

Children

No Data