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

by DatapointLabs6,110 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 Bois6,110 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

Software for Creating LS-DYNA Material Model Parameters from Test Data 

by DatapointLabs6,107 views

LS-DYNA software contains a wealth of material models that allow for the simulation of transient phenomena. The Matereality® CAE Modeler is a generalized pre-processor software used to convert material property data into material parameters for different material models used in CAE. In a continuation of previously presented work, we discuss the extension of the CAE Modeler software to commonly used material models beyond MAT_024. Software enhancements include advanced point picking to perform extrapolations beyond the tested data, as well as the ability to fine-tune the material models while scrutinizing the trends shown in the underlying raw data. Advanced modeling features include the ability to tune the rate dependency as well as the initial response. Additional material models that are quite complex and difficult to calibrate are supported, including those for hyperelastic and viscoelastic behavior. As before, the written material cards are directly readable into the LS-DYNA software, but now they can also be stored and catalogued in a material card library for later reuse.

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CompositesFoamsHigh Speed TestingInjection MoldingLS-DYNAMetalsNonlinear Material ModelsPlasticsPresentationsRubbersStructural Analysis

Selecting Material Models for the Simulation of Foams 

by DatapointLabs6,049 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