Deformation in static and transient case

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Discussion Overview

The discussion revolves around the calculation of forces on a solenoid due to its magnetic field and the resulting deformation in both static and transient cases. Participants explore the differences in displacement outcomes between these two scenarios, with a focus on the implications of applying impulsive versus continuous forces.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant describes performing both analytical calculations and FEM simulations for a solenoid under static conditions, reporting a maximum displacement of 35mm.
  • In the transient case, the same participant notes a current pulse duration of 2nsec, with a maximum displacement of only 2mm, suggesting that the impulsive nature of the force may lead to less deformation.
  • Another participant questions the validity of the initial participant's reasoning, asking for clarification on their approach and rationale.
  • A different participant raises a general inquiry about the relationship between impulsive forces and deformation, suggesting that a delta impulse may not produce the same deformation as a sustained force.
  • One participant agrees with the notion that continuous application of force may yield greater displacement compared to a brief application followed by immediate removal.
  • Another participant expresses a desire for references to support the idea that impulsive forces are less effective at causing deformation compared to sustained forces.

Areas of Agreement / Disagreement

Participants express differing views on the effectiveness of impulsive versus continuous forces in producing deformation, with some supporting the idea that continuous forces yield greater displacement while others seek clarification and references to substantiate these claims. The discussion remains unresolved regarding the underlying mechanics of these phenomena.

Contextual Notes

Participants have not fully defined the assumptions underlying their claims, particularly regarding the nature of impulsive forces and their effects on material deformation. There is also a lack of consensus on the appropriate references or theoretical frameworks to support the discussion.

1Keenan
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Hi all,

I have a doubt that I would like to solve with oyu help.
Basically I want to calculate forces on a solenoid due to the magnetic field it produces and than calculate deformation.

I consider 2 cases:
1/ Static
I did analytic calculation for force calculation, and i made FEM simulation in the static case to calculate also the displacement.
Force value is numerically in agreement with analytic result and I trust diplacement magnitude as I'm not expert in mechanical stress. result is 35mm as maximum displacement

2/ Transient
Current pulse in the solenoid is 2nsec at FWHM and tails exted for something like 5nsec, so I implement transiet simulation.
Force maximum value is the same as in the static case, but displacement is much smaller (2mm)

Now it make sense to me that such fast and impulsive stress is not very efficient, but mine is just a feeling and I would like to understand if it is correct or not and why.

Thank you
 
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Please start again and tell us clearly what you at doing and why .
 
more in general I want to understand if it is true or not that an impulsive force, something a Delta impulse in time, is not able to deform a body as if the same stress act for a long time.
 
Don't you think that applying a force continuously would give a larger displacement than applying a force and then almost immediately removing it?
 
Yes, this is what I think and why I said I have the feeling sounds logical, but I would like to have some reference I can read on this topic
 

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