October 2, 2018 at 3:42 pmserene7wingsSubscriber
Do UDF allows modification of anisotropic hyperelastic material property? UserHyper seems to be for hyperelastic ,not sure whether it works for anisotropic hyperelastic.
October 2, 2018 at 4:16 pmjpasquerellAnsys Employee
The two UPF (User programmable features) for hyperelasticity are UserHyper and UserMat.
The UserHyper routine is only used for defining isotropic hyperelastic constitutive models in which the potential is a function of I1, I2 and J. It can't be used for defining a model that is formulated in terms of any other set of invariants - including the anisotropic invariants.
The only method to program a user defined anisotropic hyperelastic model is through the usermat() routine.
August 22, 2019 at 10:02 pmansysuserSubscriber
I need to develop an hyperelastic material model following the strain energy function of Holzapfel and Ogden found in https://royalsocietypublishing.org/doi/full/10.1098/rsta.2009.0091 equation 5.38. This is an anisotropic hyperelastic material model. I was hoping to use UserHyper.F, but I discovered your comment above which indicates that this is not feasible (it would be nice if the limitations were described in the documentation rather than by chance in a forum!).
I noticed in the UPF folder for 19.3 there is another file called UserHyperAniso.F but there is no mention of this in the documentation whatsoever. Can this file be adapted for such a use, and will I be able to ask questions about how to use it here? Thanks.
July 4, 2020 at 12:33 pmkostas95Subscriber
I am also looking to develop a material that follows the Holzapfel/Ogden energy function. Did you manage to do it ? If so, would mind explaining the process you followed? Thank you.
- You must be logged in to reply to this topic.
Earth Rescue – An Ansys Online Series
The climate crisis is here. But so is the human ingenuity to fight it. Earth Rescue reveals what visionary companies are doing today to engineer radical new ideas in the fight against climate change. Click here to watch the first episode.
Subscribe to the Ansys Blog to get great new content about the power of simulation delivered right to your email on a weekly basis. With content from Ansys experts, partners and customers you will learn about product development advances, thought leadership and trends and tips to better use Ansys tools. Sign up here.
- Saving & sharing of Working project files in .wbpz format
- An Unknown error occurred during solution. Check the Solver Output…..
- Understanding Force Convergence Solution Output
- Solver Pivot Warning in Beam Element Model
- Colors and Mesh Display
- How to calculate the residual stress on a coating by Vickers indentation?
- whether have the difference between using contact and target bodies
- What is the difference between bonded contact region and fixed joint
- The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
- User manual
© 2023 Copyright ANSYS, Inc. All rights reserved.