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Mechanical and Visco-Elastic Properties of UHMWPE for In-Vivo Applications 

by DatapointLabs5,982 views

Ultra-high molecular weight polyethylene (UHMWPE) is used extensively in orthopedic applications within the human body. Components made from these materials are subject to complex loading over extended periods of time. Modeling of components used in such applications depends heavily on having material data under in-vivo conditions. We present mechanical and visco-elastic properties measured in saline at 37C. Comparisons to conventionally measured properties at room temperature are made.

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ANSYSAbaqusBiomedicalBlow MoldingExtrusionInjection MoldingMoldflowNonlinear Material ModelsPOLYFLOW Blow MoldingPOLYFLOW ExtrusionPOLYFLOW ThermoformingPapersPlasticsSIGMASOFTStructural Analysis

A Simplified Approach for Strain-Rate Dependent Hyperelastic Materials with Damage

by Paul Du Bois5,975 views

"Simulation of rubber-like materials is usually based on hyperelasticity. If strain-rate dependency has to be considered viscous dampers are added to the rheological model. A disadvantage of such a description is timeconsuming parameter identification associated with the damping constants. In this paper, a tabulated formulation is presented which allows fast generation of input data based on uniaxial static and dynamic tensile tests at different strain rates. Unloading, i.e. forming of a hysteresis, can also be modeled easily based on a damage formulation. We show the theoretical background and algorithmic setup of our model which has been implemented in the explicit solver LS-DYNA [1]-[3]. Apart from purely numerical examples, the validation of a soft and a hard rubber under loading and subsequent unloading at different strain rates is shown."

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AutomotiveHigh Speed TestingHyperelasticLS-DYNAMechanicalRate DependencyResearch PapersRubbersYielding/Failure Analysis

Mid-Stage Validation as a Process Step in Simulation V&V

by DatapointLabs5,969 views

Physically accurate simulation is a requirement for initiatives such as late-stage prototyping, additive manufacturing and digital twinning. The use of mid-stage validation has been shown to be a valuable tool to measure solver accuracy prior to use in simulation. Factors such as simulation settings, element type, mesh size, choice of material model, the material model parameter conversion process, quality and suitability of material property data used can all be evaluated. These validations do not use real-life parts, but instead use carefully designed standardized geometries in a controlled physical test that probes the accuracy of the simulation. With this a priori knowledge, it is possible to make meaningful design decisions. Confidence is gained that the simulation replicates real-life physical behavior. We present three case studies using different solvers and materials, which illustrate the broad applicability of this technique.

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3D PrintingANSYSAbaqusLS-DYNAMechanicalMetalsPlasticsPresentationsResearch PapersRubbersStructural AnalysisValidation

Selecting Material Models for the Simulation of Foams 

by DatapointLabs5,922 views

We seek to lay down a framework to help us understand the different behavioral classes of foams. Following a methodology that we previously applied to plastics, we will then attempt to propose the right LS-DYNA material models that best capture these behaviours. Guidelines for model selection will be presented as well as best practices for characterization. Limitations of existing material models will be discussed.

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ANSYSAbaqusAutomotiveConsumer ProductsFoamsHigh Speed TestingHome AppliancesLS-DYNAMSC.DYTRANMaterial SupplierNonlinear Material ModelsPackagingResearch PapersStructural Analysis