HELP!! How to connect Truss element to 3d body

[MarceloM]

Hello,

I'm trying to connect a heel to a truss element to simulate the plantar fascia, however I do not know how to perform this operation. What kind of constraint do i use? See the picture.

Thanks for the help!

 

[MarceloM]

Here.

 

[Erik Panos Kostson]

As you can see I hope, it is the same problem as before (these nodes are on truss elements most likely).

Just use one single element with no compression.

 

[MarceloM]

Results when i use one single element with no compression.

Thank you.

 

[Erik Panos Kostson]

OK you do not understand what the problems are here, what I am saying, and how to resolve this.

I am not going to teach you FEA here (it is of course good to know about FEA when undertaking such a complex task), so the most important thing is to understand that a series of connected truss elements are a chain-link and thus singular (instable, there is not enough stiffness generated in order to solve this problem). So for every series/chain of interconnected truss elements, needs to be a single truss element instead.

So whatever the trusses represent, say a tendon, then each tendon should then consist of a single truss element (a single finite element) with no compression property. So when you mesh, use a coarse mesh size on the tendons so you get only one truss finite element per tendon.

 

[MarceloM]

I finally understand what you mean by one single element, now it works.

Thank you so much and i am sorry.

 

[Erik Panos Kostson]

Glad to hear that you have managed.

Happy to help, so no worries.

PS:

There is a dedicated ABAQUS eng tips forum, where you can post ABAQUS related questions. You might get more response there in the future.