When I did the Geotextile simulation, I set the elastic modulus, Poisson's ratio and yield stress and plastic deformation for the material as in this article, and added the fracture strain with flexible damage, but the final result is that the ejector rod is jacked back and the geotextile is not broken. Besides the stress is so small that it does not reach the yield stress. These data were obtained by me through tensile tests.
The failure of the code comes from the equations used and the laws of variation of the parameters you mention. The fundamental problem is to use parameters that represent microscopic processes during deformation as a function of stress. These parameters are not constants and their value depends on the variation of the internal energy of the materials, which depends on their initial state and its evolution as a function of the intensity of the applied stress, its speed, the test time and the strain rate.
Based on your description, the ejector rod being pushed back suggests that the geotextile material is deforming under stress, but not to the point of breaking. The stress isn't high enough to cause plastic deformation or yield, indicating either the material is resilient or the stress is insufficient for significant deformation. Some considerations:
Let me know if you need further technical assistance at Https://wa.me/+923440907874.
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