Abaqus Ultra High Molecular Weight Poly Ethylene (UHMWPe) Material Modelling

AI Thread Summary
The discussion focuses on modeling wrist implants in Abaqus, specifically addressing issues with simulating Ultra High Molecular Weight Polyethylene (UHMWPe). The user, Euan, has encountered errors related to UHMWPe while using basic elastic material definitions, including a Young's modulus of 3.4 x 10^8 Pa and a Poisson’s ratio of 0.4. Experts suggest that accurate modeling of polymers like UHMWPe requires hyperelastic elements and detailed material data to reflect their behavior under load. The conversation emphasizes the importance of using appropriate material properties for realistic simulations. Accurate material definitions are crucial for improving simulation outcomes and efficiency.
euanfoster
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Hey there,

I am currently working on creating models in Abaqus of Wrist implants to see how they respond under different loading conditions. I have used Mimics to export orphan meshes of the wrist bones and also imported the wrist implant itself. My simulations seems to be running fine all apart from one component. One of the components in the wrist implant is UHMWPe which keeps throwing up errors in the results.

I am not a huge expert with Abaqus and have just defined the material as a simple elastic material with a young's modulus of 3.4 x 10^8[Pa] & a Poisson’s ratio of 0.4.

I was wondering if anyone knows how to define the material properties of UHMWPe in a a more complex and realistic manner? Detailed answers would be appreciated as the simulation now takes a day and a bit to complete.

Thanks,

Euan.
 
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Modeling some polymers accurately in FEA requires the use of hyperelastic elements and accurate material data in the hyperelastic regime. It will all depend on what kind of material data you have regarding the material in question.
 

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