How should the facet size be related to the facet distance ?

[[Fa...]]

Hello together,

The facets are used to track the material points during deformation.

The bigger the facets the easier to keep track of them, given optimum pattern quality.

The facet distance will affect the strain reference length (SRL) directly.

So far this is my understanding.

But how should the two be related for an optimal deformation analysis?

What would be the effect of choosing a facet size of 60 px and 5 px of facet distance (1) or the effect of choosing 16 px facet size but 60 px of distance (2) ?

How would the quality of the deformation analysis be different between (1) and (2) ?

Let's say for a target SRL my facet distance is 40 px then what should be the optimal choice of facet size (given that I can provide a pattern quality for any given facet size) ?

 

Greetings.

[[Mo...]]

The accuracy of calculations within facets depends on both the facet spacing and facet size. The information within each facet is influenced by neighboring facets, as data is obtained from them.

In the first scenario (1), the facet size is 60px and the facet distance is 5px. This configuration leads to a large overlap between facets, which is unnecessary and result in 

Longer computation time.

In the second scenario (2), the facet size is 16px and the facet distance is 60px. Here, there is no overlap between facets, but a gap exists between them. Consequently, there will be no calculation performed within the area between the facets, and the interpolation on the distance will not be accurate due to the large gap and you will get worse coordinate measuring accuracy.

Based on these considerations, a recommended standard configuration would be to use a facet size of 19px with a light overlap of 16px distance. For a useful computation and representation of the measuring results, set an overlapping area from 20% to maximum 50%.

[[Fa...]]

Dear Mohamed,

Thank you for the explanatory answer!