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

In summary, the conversation discusses the use of Abaqus to create models of wrist implants and the issue of one component, UHMWPe, causing errors in the simulation. The individual is not an expert in Abaqus and is seeking advice on how to define the material properties of UHMWPe in a more complex and accurate manner. They mention that using hyperelastic elements and accurate material data in the hyperelastic regime may be necessary for accurate modeling.
  • #1
euanfoster
1
0
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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  • #2
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.
 

What is Abaqus Ultra High Molecular Weight Poly Ethylene (UHMWPe) Material?

Abaqus Ultra High Molecular Weight Poly Ethylene (UHMWPe) Material is a type of polymer material with a very high molecular weight, typically exceeding 1 million g/mol. It is known for its high strength, low coefficient of friction, and excellent impact resistance, making it a popular choice for various applications in industries such as automotive, aerospace, and medical.

How is UHMWPe material modelled in Abaqus?

UHMWPe material can be modelled in Abaqus using the viscoelasticity or hyperelasticity material models. These models take into account the unique properties of UHMWPe, such as its non-linear stress-strain behavior and high strain rate sensitivity. The material parameters can be obtained through experimental testing or from published literature.

What are the challenges of modelling UHMWPe material in Abaqus?

One of the main challenges of modelling UHMWPe material in Abaqus is accurately capturing its non-linear behavior and strain rate sensitivity. This requires careful selection of material models and accurate determination of material parameters. Additionally, the high molecular weight of UHMWPe can also lead to convergence issues in simulations, which may require special techniques such as reduced integration or mesh refinement.

What are some common applications of UHMWPe material?

UHMWPe material is commonly used in applications that require high strength, low friction, and impact resistance. Some examples include bearings, gears, conveyor belts, bulletproof vests, and medical implants such as hip and knee replacements. It is also used in the production of ultra-high molecular weight polyethylene fibers, which are used in ropes and cables for offshore platforms and other heavy-duty applications.

What are the advantages of using Abaqus for UHMWPe material modelling?

Abaqus offers a wide range of material models and advanced simulation capabilities, making it a powerful tool for modelling UHMWPe material. It also allows for multi-physics simulations, which can be useful for studying the behavior of UHMWPe in complex loading conditions. Furthermore, Abaqus has a user-friendly interface and extensive documentation, making it accessible to researchers and engineers from different backgrounds.

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