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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
I have tried using a sensor as described in Article Number
000002688:
 
What I have so far:
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Sensor event definition
.MODEL_1.Deformation - SENVAL(DeformationSensor)
 
Sensor event evaluation:
.MODEL_1.Deformation
 
SForce:
IF( .MODEL_1.Deformation: forceValue, 0, 0 )
 
Questions:
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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?
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    OK, here is an example for you. Rename the attachment to ElastoPlast.cmd and import into View.
    Simulate for 10 s, 500 steps. Plot request .ElastoPlast.Last_Run.Ground_Data.Ground_Force vs .ElastoPlast.Last_Run.Ground_Data.Deformation
     
    This model has three parameters:
    PlastDef0: The deformation that defines the "knee" of the elasto-plastic curve. Set to zero for pure plastic behavior.
    K_elast: Stiffness of the elastic part (as well as off-loading behavior). Set to very high for pure plastic behavior.
    K_plast: Stiffness of the plastic deformation. Set to a low value for true plastic.
     
    You can probably change the model to be true constant plastic behavior by setting PlastDef0=0, K_elast very high (>1e6) and changing the solver variable Plast_Force to a constant value.
     
    Attached Files (1)
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  • 0
    OK, here is an example for you. Rename the attachment to ElastoPlast.cmd and import into View.
    Simulate for 10 s, 500 steps. Plot request .ElastoPlast.Last_Run.Ground_Data.Ground_Force vs .ElastoPlast.Last_Run.Ground_Data.Deformation
     
    This model has three parameters:
    PlastDef0: The deformation that defines the "knee" of the elasto-plastic curve. Set to zero for pure plastic behavior.
    K_elast: Stiffness of the elastic part (as well as off-loading behavior). Set to very high for pure plastic behavior.
    K_plast: Stiffness of the plastic deformation. Set to a low value for true plastic.
     
    You can probably change the model to be true constant plastic behavior by setting PlastDef0=0, K_elast very high (>1e6) and changing the solver variable Plast_Force to a constant value.
     
    Attached Files (1)
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