COMSOL: Newton's Iteration reached - Stress testing sensor

In summary: Non linearity is enabled.The hyperelastic material might be unstable in a given strain range. Try with a lower load and maybe a different hyperelastic model. What is the source of data for material constants in this case ?
  • #1
uppityd
5
0
It is a sensor with a fixed surface and a prescribed displacement on the opposite

To remove this message error,

I have tried to
  1. Increase iterations
  2. Refined mesh
  3. Applied parametric studies
  4. And some other ideas from forums
However it still cannot be solved

It also has a warning of MUMPS out of core
 

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  • #2
How are these parts connected ? Do you use contact in this analysis ?
 
  • #3
FEAnalyst said:
How are these parts connected ? Do you use contact in this analysis ?
They are joined using form union, i would like to put contact between the sensors together in later.
 
  • #4
uppityd said:
They are joined using form union, i would like to put contact between the sensors together in later.
Right, it’s better to avoid contact until the analysis converges with Form Union. Especially that contact in Comsol is very susceptible to convergence difficulties.

Contact is not used here but there are other forma of nonlinearity in this model, right ? Do you have the geometric nonlinearity enabled ? What about the material model - which one do you use ?
 
  • #5
FEAnalyst said:
Right, it’s better to avoid contact until the analysis converges with Form Union. Especially that contact in Comsol is very susceptible to convergence difficulties.

Contact is not used here but there are other forma of nonlinearity in this model, right ? Do you have the geometric nonlinearity enabled ? What about the material model - which one do you use ?
Sorry, I should have specified a lot better.

The main reason is that the block underneath the spherical disks is a hyperelastic material. If the whole model were to be set as a linear material then it converges, however when set as a hyperelastic material, the block underneath, then it does not.Non linearity is enabled.
 
  • #6
The hyperelastic material might be unstable in a given strain range. Try with a lower load and maybe a different hyperelastic model. What is the source of data for material constants in this case ?
 

1. What is COMSOL and how does it relate to Newton's Iteration?

COMSOL is a software program used for simulation and modeling in various scientific and engineering fields. It uses Newton's Iteration method to solve complex equations and systems of equations, making it a powerful tool for stress testing sensors.

2. What is Newton's Iteration and how does it work?

Newton's Iteration is a numerical method used to find the roots of a function or solve a system of equations. It involves making an initial guess and then improving upon it through a series of iterations, using the derivative of the function at each step. This process is repeated until the desired level of accuracy is achieved.

3. How is COMSOL used for stress testing sensors?

COMSOL allows for the creation of detailed models of sensors and their surrounding environment. By applying different stress conditions to the model and using Newton's Iteration method, the software can accurately predict the behavior and performance of the sensor under various stress levels. This allows for the optimization and improvement of sensor designs.

4. What are the benefits of using COMSOL for stress testing sensors?

COMSOL offers a more efficient and cost-effective way to test sensors compared to traditional physical testing methods. It also allows for a deeper understanding of the sensor's behavior and performance, which can lead to improved designs and increased reliability.

5. Are there any limitations to using COMSOL for stress testing sensors?

While COMSOL is a powerful tool, it is important to note that the accuracy of the results depends on the accuracy of the model and the assumptions made. Additionally, the software requires a certain level of expertise and may not be suitable for all types of sensors or stress testing scenarios.

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