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Contact Problem. Late contact

Contact Problem. Late contact

Contact Problem. Late contact

(OP)
Hi,
I´m simulating a prosthetic foot, and i want to calculate the stresses and displacements.
The foot is made of carbon fiber (continuum shell elements), and to model the contact i´ve created a infinite rigid plate.
I would prefer not to use the plate, instead of that, i think that it would be better to put the boundary conditions in the base of the food. I have tried, but the conditions are too severe, and the stresses and deformation are very high. I want to let a small longitudinal displacement of the contact nodes to soften the conditions. Maybe you can also help me with this.
In the case of the plate, i ´ve let a small gap between the foot and the plate (0,1 mm). And i´ve placed a load (force) of 1125N (vertical) in the upper side of the foot with a distributing coupling .
The contact is a surface-surface contact. I don´t know what is best, finite or small sliding.
The proble is that when i run the static analysis, i see that the foot is deforming from the beginning, but the CSTAT shows that the contact occurs later. when the analysis has run up to 99%.
Should i activate another command? I don´t know why the foot is stressing without contact (500MPa in some zones). It´s not normal.
Could you help me?
Thanks in advance.

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