Hello everyone,
I plan to model a knitted reinforcement within a rubber hose in Abaqus in order to analyse the various stresses sustained by them during hose expansion.
I am wondering whether to model them using beam elements or solid elements in abaqus.
What would be the fundamental difference, for which beam elements could be preferrable over solid elements for such an application?
Dear Jonah Hoffmann,
the most obvious reason for using beam elements would be speed of numerical simulation. Beam F.E. are far more computationally efficient than solid F.E. since they have less DoFs.
On the other hand solid F.E. would resemble better the physical problem and offer visualized information about the distributions of stresses, strains etc. through the thickness and in various planes/views.
Moreover, if you use solid F.E., you will notice that in the points were different "curves" of the knitted structure coincide there are stress concentrations and the structure becomes more stiff, while by using beam F.E. this effect will be less important (because beams are like lines, they do not have physical thickness to collide to each other).
Those are my major points regarding your choice between beam and solid F.E. Hope it helped!
Kind regards,
Anargyros
The geometry of beam element is only characterised by cross sectional area A and inertia moments I, so it will not allow the 3D behaviour of your component to be fully captured. In my view, you have two options:
- 2D plane model (cross-section), under plain strain or plane stress;
- 3D model (hexa elements) - computationally demanding
If you are looking for predicting the global behavior of your model, using the beam element is more efficient because of its lower computational effort. If the local behavior is important for you, you must use 3D or shell element. I believe that shell element is more efficient like the following paper:
Article An updated Lagrangian finite element formulation for large d...
What are the materials for the knitted reinforcement? Is the material model linear?
Hallo Fang, the material is Aramid (Kevlar) and is hence highly anisotropic. But I would like to focus only on the in-plane stresses and not through the thickness so much.
The beam model based on mechanics of structure genome is able to capture 3D stress fields by structural analysis using 1D beam element and beam constitutive modeling. The theory has been implemented into SwiftComp which can be freely executed on the cloud: https://cdmhub.org/resources/scstandard. This paper " Liu, X. and Yu, W., 2016. A novel approach to analyze beam-like composite structures using mechanics of structure genome. Advances in Engineering Software, 100, pp.238-251." may be helpful for you.
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