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

by Paul Du Bois5,972 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

A Simplified Approach to the Simulation of Rubber-like Materials under Dynamic Loading

by Paul Du Bois5,554 views

"The simulation of rubber materials is becoming increasingly important in automotive crashworthiness simulations. Although highly sophisticated material laws are available in LS-DYNA to model rubber parts, the determination of material properties can be non-trivial and time consuming. In many applications, the rubber component is mainly loaded uniaxially at rather high strain rates. In this paper a simplified material model for rubber is presented allowing for a fast generation of input data based on uniaxial static and dynamic test data."

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AutomotiveHigh Speed TestingHyperelasticLS-DYNAMechanicalRate DependencyResearch PapersRubbers

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

by DatapointLabs5,988 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

Providing an Experimental Basis in Support of FEA 

by DatapointLabs5,865 views

The use of CAE in design decision-making has created a need for proven simulation accuracy. The two areas where simulation touches the ground are with material data and experimental verification and validation (V&V). Precise, well designed and quantitative experiments are key to ensure that the simulation initiates with correct material behavior. Similar validation experiments are needed to verify simulation and manage the risk associated with this predictive technology.

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AbaqusAutomotiveBiomedicalBuilding MaterialsCAE Vendor/SupplierCompositesConsumer ProductsElectonics/ElectricalEnergy and PetroleumFoamsIndustrial GoodsMaterial SupplierMetalsMold Maker/DesignerNonlinear Material ModelsPlasticsPresentationsRubbersSIMULIAStructural AnalysisToys/Sporting Goods

Material Parameter Calibration Services for Abaqus Non-Linear Material Models

by DatapointLabs6,099 views

DatapointLabs' TestPaks (material testing + model calibration + Abaqus input decks) for rate-dependent, hyperelastic, viscoelastic, NVH, and the use of Abaqus CAE Modeler to transform raw data into material cards will be presented. A representative from Idiada will present a case study explaining the use of DatapointLabs’ material data and TestPaks for simulation.

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AbaqusCompositesFoamsHigh Speed TestingMetalsNonlinear Material ModelsPlasticsPresentationsRubbersSIMULIAStructural Analysis

Understanding and Coping with Material Modeling Limitations in FEA 

by DatapointLabs5,791 views

The limitations of modeling materials for simulation are discussed, including lack of clarity in material model requirements, gaps between the material data and the model to which it will be fitted, issues in obtaining pertinent properties, difficulties in parameter conversion (fitting), and preparation of input files for the software being used. Means to address these limitations are presented, including understanding the model completely, measuring the correct data with precision on the right material, selecting the best model for the data and ensuring the best fit of the model to the data, validating the model against a simple experiment, and following best practices to create an error-free input file.

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Aerospace and DefenseAutomotiveBiomedicalConsumer ProductsElectonics/ElectricalFoamsHome AppliancesIndustrial GoodsMaterial SupplierPackagingPlasticsPresentationsRubbersToys/Sporting Goods

Characterization of Damage in Hyperelastic Materials Using Standard Test Methods and Abaqus

by DatapointLabs5,771 views

Over the past couple of decades, standard test methods and material models have existed for rubber-like materials. These materials were classified under the category of Hyperelastic materials. Well established physical test methods and computational procedures exist for the characterization of the material behavior in tension, compression, shear volumetric response, tear strength etc. However, effective modeling of the fracture behavior of hyperelastic materials using finite element techniques is very challenging. In this paper, we make an attempt to demonstrate the use of such standard test methods and the applicability of such test data for performing finite element analyses of complex nonlinear problems using Abaqus. Our goal is to demonstrate the effective use of standard physical test data to model multi-axial loading situations and fracture of hyperelastic materials through tear tests and indentation test simulations.

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AbaqusIndustrial GoodsMaterial SupplierNonlinear Material ModelsResearch PapersRubbersStructural Analysis

Material Modeling of Soft Material for Non-linear NVH 

by DatapointLabs5,574 views

Abaqus’ Non-linear NVH capability permits the capture of material behavior of rubber seals and bushings, plastic parts and foam inserts which have a significant influence on the simulation. In this presentation, we discuss material calibration procedures for this application.

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AbaqusAutomotiveBuilding MaterialsMaterial SupplierNonlinear Material ModelsPlasticsPresentationsRubbersStructural Analysis