One of the challenges of analysing the performance of large strain materials like rubbers and synthetic elastomers is how the finite element mesh distorts as the part deforms. You may well start out with a lovely mesh where all your elements meet your quality standards, but as the part distorts the element quality gets worse and worse until it can actually prematurely end the analysis because of excessive distortion, let alone give you poor results.
This is not an uncommon problem.
You can try re-meshing the part so that the effects of distortion are not so pronounced, but this is incredibly time-consuming as a manually iterative process.
You can try using many more smaller elements, but this has a negative impact on the solution time and the computing resources needed to solve the problem. Some FEA codes use a ‘shuffling’ algorithm where nodes are nudged around to improve the quality at each load increment, but there are limits to what this can achieve.
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