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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

Plastics & Simulation 

by DatapointLabs5,532 views

Plastics exhibit non-linear viscoelastic behavior followed by a combination of deviatoric and volumetric plastic deformation until failure. Capturing these phenomena correctly in simulation presents a challenge because of the inadequacy of currently used material models. We follow an approach where we outline the general behavioral phenomena, then prescribe material models for handling different phases of plastics deformation. Edge cases will then be covered to complete the picture. Topics to be addressed include: Using elasto-plasticity; When to use hyperelasticity; Brittle polymers – filled plastics; Failure modes to consider; Criteria for survival; Choosing materials; Spatial non-isotropy from injection molding; Importance of residual stress; Visco-elastic and creep effects; Strain-rate effects for drop test and crash simulations; Fitting material data to FEA material models.

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ANSYSHigh Speed TestingNonlinear Material ModelsPlasticsPresentations

Comments on the Testing and Management of Plastics Material Data 

by DatapointLabs6,670 views

Plastics appeared as design materials of choice about 30 years ago. They brought with them huge design challenges because their multi-variable, non-linear nature was not well understood by engineers trained to work in a linear elastic world. We outline a 20 year journey accompanying our customers in their efforts to understand and simulate these remarkable materials to produce the highly reliable plastic products of today. We discuss challenges related to processes such as injection molding vs. blow-molding; coping with filled plastics; the difficulties of modeling polymers for crash applications. We include our latest findings related to volumetric yield in polymers and its relationship to failure. We describe the material database technology that was created to store this kind of multi-variable data and the analytical tools created to help the CAE engineer understand and use plastics material data.

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ANSYSAbaqusAutomotiveBlow MoldingDIGIMATHigh Speed TestingInjection MoldingLS-DYNAMoldex3DMoldflowNonlinear Material ModelsPAM-CRASHPlasticsPresentationsStructural AnalysisUniversal CrashUniversal MoldingUniversal Structural

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

Testing for Crash & Safety Simulation

by DatapointLabs5,851 views

The testing of materials for use in crash and safety simulations and the conversion of test data into material models is a process that is not well standardized in the industry. Consequently, CAE users face uncertainty and risk in this process that can have a negative impact on simulation quality. In this workshop, we present approaches currently used in the US for the gathering of high quality test data plus the acclaimed Matereality CAE Modeler software that is used to transform high strain-rate data into crash material cards.

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ANSYSAbaqusAltair RADIOSSAutomotiveDIGIMATHigh Speed TestingLS-DYNANX NastranNonlinear Material ModelsPAM-CRASHPresentationsSIGMASOFTStructural Analysis

A Standardized Methodology for the DigimatMX Reverse Engineering Process 

by DatapointLabs5,361 views

We present a methodology for DIGIMAT users to perform the DIGIMAT MX reverse engineering process to obtain material parameter inputs for crash, elasto-plastic, creep and visco-elasticity. The injection-molding process used involves a standardized plaque geometry with fully developed flow, with test specimens taken from a specific plaque location. A standardized testing procedure is applied and the resulting DIGIMAT MX inputs are handled in a streamlined data stream, which saves time and improves the reliability of the reverse engineering process. The DIGIMAT MX reverse engineering itself can be performed as a service in collaboration with e-Xstream. This gives the user a speedy and tightly controlled process for performing complex finite element analysis with filled plastics

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Blow MoldingDIGIMATExtrusionHigh Speed TestingInjection MoldingNonlinear Material ModelsPresentationsStructural Analysis

Behavior-based Material Model Selection and Calibration of Plastics for Crash Simulation 

by DatapointLabs5,560 views

Many material models are available for crash simulation. However, common models are not designed for plastics. We present best practices developed for adapting common models to plastics, as well as best testing protocols to generate clean, accurate rate-dependent data. In addition, we present a streamlined process to convert raw data to LS-DYNA material cards, and harmonized material datasets that allow the same raw data to be used for other crash and rate-dependent analysis software.

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ANSYSAbaqusAltair RADIOSSAutomotiveHigh Speed TestingLS-DYNANonlinear Material ModelsPAM-CRASHPlasticsPresentationsStructural Analysis

A Robust Methodology to Calibrate Crash Material Models for Polymers

by DatapointLabs6,875 views

High strain rate material modelling of polymers for use in crash and drop testing has been plagued by a number of problems. These include poor quality and noisy data, material models unsuited to polymer behaviour and unclear material model calibration guidelines. The modelling of polymers is thus a risky proposition with a highly variable success rate. In previous work, we tackled each of the above problems individually. In this paper, we summarize and then proceed to present a material modelling strategy that can be applied for a wide variety of polymers.

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ANSYSAbaqusAerospace and DefenseAltair RADIOSSAutomotiveConsumer ProductsHigh Speed TestingHome AppliancesIndustrial GoodsLS-DYNAMSC.DYTRANMaterial SupplierMechanicalNonlinear Material ModelsPAM-CRASHPackagingPlasticsResearch PapersStructural Analysis