Carbon Fiber prosthetic foot - STIFFNESS
Carbon Fiber prosthetic foot - STIFFNESS
(OP)
I have made a FEM model of a prosthetic foot. And i want to obtain the stiffness of the model.
I´m thinking of doing a Force vs Displacement graph, but i´m still not sure how to accomplish my purpose.
I need some help.
Thanks in advance.
I´m thinking of doing a Force vs Displacement graph, but i´m still not sure how to accomplish my purpose.
I need some help.
Thanks in advance.






RE: Carbon Fiber prosthetic foot - STIFFNESS
RE: Carbon Fiber prosthetic foot - STIFFNESS
you saved my life!
THANK YOU VERY MUCH!!!
RE: Carbon Fiber prosthetic foot - STIFFNESS
That's a mouthful, I know. Think of an ordinary beam member. It will have an axial stiffness and an infinite number of flexural and shear stiffnesses depending on where the load is applied and the displacement is measured.
The force vs displacement graph is a great idea. All you'll need to do is isolate what force, and what displacement, will be required to provide you with meaningful results. Then just turn your FEM software loose, hopefully with some way to perform a hand check on the results.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Carbon Fiber prosthetic foot - STIFFNESS
another day in paradise, or is paradise one day closer ?
RE: Carbon Fiber prosthetic foot - STIFFNESS
I tought over it, i know that there isn´t an only stiffness. Furthermore, the prothesis has a variable thickness, and the non linearity issue is there.
I think that i´m going to plot the results in the point where the load is applied.
on the other hand, i found the way to get the global stiffness matrix in abaqus. But the model has lots of nodes. I´m trying to reduce de model to some nodes and build a condensed stiffness matrix. But i did´t find the way yet.
Thank you very much guys!