Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Structural module, thin elastic layer with nonlinear forces, solver option for nonlinear systems
Posted Jul 28, 2016, 7:26 a.m. EDT Version 5.0 0 Replies
Please login with a confirmed email address before reporting spam
I'm modeling a quite simple system of a composite material. Basically three cylindrical fibers embedded in a cuboid matrix.
All the materials are linear elastic. The numerical simulation aims to reproduce a quasi-static test so I use a parametric sweep over the imposed displacement with a relative small loading step.
Particularly I model the matrix/fiber interfaces, i.e., the external surface of the cylinders, as a thin elastic layer (TEL) with a nonlinear force of the type:
F= C [u]^3
in which C is a stiffness constant (the same for all three matrix/fiber interfaces) and [u] is the displacement jump.
Questions:
- Can I use a single TEL for all fibers? Or I must create a TEL for every cylinder?
- Using the TEL option on a cylindrical surface require some particular attentions?
- Finally, because of this modeling choice concerning interfaces I have to solve a nonlinear and implicit system of equations, moreover the interface stiffnesses are very high, as a result I have some convergence problems.
What is, in my case, the optimal choice for the solver configuration?
Thank you in advance.
Hello Maria Letizia Raffa
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.