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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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  • 0
    I see your problem. Once you get into the plastic zone, and deformation increases, the sensor changes and deformation changes is zero. Traditionally (using subroutines) this can be handled by using a reqsub to store the max deformation as a reqsub is only called at output steps. The reqsub would store the value in a common block / global variable that can then be used by the sfosub.
    But as long as your plastic and elastic stiffness are constant, this can be handled with some logic.
    Let me get back to you on this.
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  • 0
    I see your problem. Once you get into the plastic zone, and deformation increases, the sensor changes and deformation changes is zero. Traditionally (using subroutines) this can be handled by using a reqsub to store the max deformation as a reqsub is only called at output steps. The reqsub would store the value in a common block / global variable that can then be used by the sfosub.
    But as long as your plastic and elastic stiffness are constant, this can be handled with some logic.
    Let me get back to you on this.
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