Can Software Calculate Creep and Stress Relaxation in Spring-Damper Models?

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Discussion Overview

The discussion revolves around the possibility of using software to calculate creep and stress relaxation in spring-damper models. Participants explore the capabilities of various software tools, particularly Matlab/Simulink and Mathematica, in performing these calculations.

Discussion Character

  • Technical explanation, Exploratory, Debate/contested

Main Points Raised

  • One participant inquires about software options for calculating creep and stress relaxation in spring-damper models, specifically asking about Matlab/Simulink.
  • Another participant suggests that if the constitutive equations can be formulated in the s-domain, symbolic software could find the inverse Laplace transform to derive the necessary equations, mentioning Mathematica and expressing uncertainty about Matlab's capabilities.
  • A different participant expresses doubts regarding the applicability of standard equations due to the specific model configuration, which lacks a free "extremity" and has constraints on both sides, complicating the use of the Heaviside step function.
  • One participant proposes that converting components into impedances might allow for the combination of these components to derive displacement as a function of load.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the applicability of the software or the formulation of the equations, indicating that multiple views and uncertainties remain in the discussion.

Contextual Notes

Participants note limitations related to the specific model configuration and the potential challenges in applying standard equations due to the lack of a free extremity.

Stealth101
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Hi all, I have a question.

Does exists a software that is able to calculate creep and stress relaxation of a model of springs and dampers?

Is Matlab/Simulink able to do this?

Thanks in advance.
 
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Hi Stealth101, welcome to PF. If you're able to put the components' constitutive equations together in the s-domain, any symbolic software should be able to find the inverse Laplace transform, which will give you the equations you're looking for. Mathematica can do it, certainly; I'm pretty sure the Matlab can also, but I don't have that immediately at hand.
 
Mapes said:
If you're able to put the components' constitutive equations together.

I have some doubts about the equations, because I have to study a model without a free "extremity" so I can't apply the Heaviside step function in the classic way.

Practically this model has the "chassis" both on the right side and left side.

I'm sorry for my poor English.
 
Still, if you can turn all the components into impedances (k for springs, for dashpots), hopefully you can combine them like springs and get displacement as a function of load.
 

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