Need help in constraining the meniscus of the knee.

[albert22]

Hi
I am a postgraduate student. I was trying to run a model of knee. I used springs to constrain the meniscus horns, but I failed to converge at the time when the femoral cartilage and the meniscus were just in contact, as negative jacobian is detected.
But if I constrained one the of face of the horns in vertical direction(Y direction) , it worked. But this is not the method other researchers used.
I have attached the picture of my model. I can't upload the model in this forum. If someone is interesting, just give me your email, I will send the model to you. Thanks.


Regards
Albert





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[ateshian]

Hi Albert,

It is not easy to diagnose your problem with the information provided. Have you tried varying the spring stiffness by an order of magnitude up or down to see if that improves/worsens the convergence?

Best,

Gerard

[albert22]

Hi Gerard，

I have tried but it still didn't work. When I used another knee model with the same settings, it worked.

Regards,
Albert