Material Insights by Other

Presentations

Sort byDateViews

New Generation Modeler for LS-DYNA Material Parameter Conversion

by Matereality9,477 views

We describe a new software component that takes into consideration the unique multi-variate nature of LS-DYNA material models. Rate-dependent models require adjustment and tuning of many material parameters to fit the rate-dependent tensile properties. Drawing upon a robust back-end data model, a graphical user interface provides drag and drop capability to allow the user to perform tasks such as model extrapolation beyond tested data, modulus change, rate dependency tuning and failure criteria adjustment while assuring self-consistency of the underlying material model. Unit system conversions are also facilitated, eliminating error and ensuring that material inputs to simulation correctly reflect the intent of the CAE analyst. The utility of the Matereality CAE modelers is illustrated with examples for LS-DYNA material models MAT_019, MAT_024 and MAT_089 LCSR.

Read full post
LS-DYNAMaterealityMechanicalPapersPresentationsRate DependencyYielding/Failure Analysis

A Process for Creating, Managing and Deploying Materials in ANSA

by Matereality8,480 views

Systems simulations involve material models for many materials. Since different kinds of simulations may be performed ranging from NVH to crash, such material files exist for a variety of solvers. It is a difficult task to ensure the self-consistency of material nomenclature for all these cases, such that the materials information is current and the right material files are used for each material. We present a system where materials information is uniformly deployed to CAD and CAE from libraries set up in Matereality. Consistent naming conventions and unit systems are used. Material files are linked to source material data for reference and traceability.

Read full post
ANSAMaterealityMaterials Information ManagementPapersPresentations

Workshop: Testing, Modeling and Validation for Plastics & Rubber Simulation in ANSYS

by DatapointLabs8,015 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 limitations in commonly 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; The use of mid-stage validation as a tool to confirm the quality of simulation before use in real-life applications.

Read full post
ANSYSDensityHyperelasticInjection MoldingMechanicalPlasticityPlasticsPresentationsRate DependencyRheologyRubbersStructural AnalysisThermalValidationViscoelasticYielding/Failure Analysis

The Role of Material Data in the Simulation of Injection Molded Parts

by DatapointLabs7,476 views

The modeling of material behavior for injection molded plastics is a vital step for good simulation results. We detail the types of material data needed by various injection-molding simulation programs, factors that can affect simulation quality including test techniques and process variables such as moisture content. The case of fiber filled plastics is covered along with the extension to structural analysis applications.

Read full post
AbaqusDIGIMATInjection MoldingLS-DYNAMoldex3DMoldflowNonlinear Material ModelsPlasticsPresentationsRate DependencySIGMASOFTSimpoe-MoldStructural AnalysisUniversal MoldingValidationViscoelastic

Challenges in the Modeling of Plastics in Computer Simulation

by DatapointLabs7,256 views

Finite-element analysis and injection-molding simulation are two technologies that are seeing widespread use today in the design of plastic components. Limitations exist in our ability to mathematically describe the complexity of polymer behavior to these software packages. Material models commonly used in finite-element analysis were not designed for plastics, making it difficult to correctly describe non-linear behavior and plasticity of these complex materials. Time-based viscoelastic phenomena further complicate analysis. Dealing with fiber fillers brings yet another layer of complexity. It is vital to the plastics engineer to comprehend these gaps in order to make good design decisions. Approaches to understanding and dealing with these challenges, including practical strategies for everyday use, will be discussed.

Read full post
AbaqusBlow MoldingDIGIMATExtrusionInjection MoldingLS-DYNAMechanicalNonlinear Material ModelsPlasticsPresentationsStructural AnalysisThermoforming

A Mechanism for the Validation of Hyperelastic Materials in ANSYS

by DatapointLabs7,024 views

Hyperelastic material models are complex in nature requiring stress-strain properties in uniaxial, biaxial and shear modes. The data need to be self-consistent in order to fit the commonly used material models. Choosing models and fitting this data to these equations adds additional uncertainty to the process. We present a validation mechanism where, using of a standard validation experiment one can compare results from a simulation and a physical test to obtain a quantified measure of simulation quality. Validated models can be used with greater confidence in the design of real-life components.

Read full post
ANSYSHyperelasticMechanicalPapersPresentationsStructural AnalysisValidation

Software for Creating and Managing Material Specifications 

by DatapointLabs6,941 views

Material specifications define properties for incoming materials to meet required criteria. We present software that manages creation of material specifications, input of properties and material composition; and provides a way to evaluate qualification per specification. While it is designed for OEM/Tier n environments, it is also applicable for materials suppliers.

Read full post
ADINAANSYSANSYS FIDAPAbaqusAltair HyperXtrudeAltair RADIOSSAutomotiveB-SimCadmouldDIGIMATLS-DYNAMSC.DYTRANMSC.MARCMSC.NASTRANMoldex3DMoldflowNX NastranPAM-CRASHPAM-FORMPOLYFLOW Blow MoldingPOLYFLOW ExtrusionPOLYFLOW ThermoformingPlanetsXPolyXtruePolycadPresentationsSIGMASOFTSOLIDWORKSSimpoe-MoldT-SimUniversal MoldingVELVISI FlowWinTXS

Validation of Simulation

by DatapointLabs6,717 views

Physically accurate simulation is a requirement for initiatives such as late-stage prototyping, additive manufacturing, and digital twinning. Simulations use mathematical models to replicate physical reality. Verification and validation (V&V) is an important step for high-fidelity simulation. While verification is a way to check the accuracy of these models, factors such as simulation settings, element type, mesh size, choice of material model, material parameter conversion process, quality and suitability of material property data used can have a large impact on simulation quality. Validation presents a means to check simulation accuracy against a physical experiment. These validations are a valuable tool to measure solver accuracy prior to use in product development. Confidence is gained that the simulation replicates real-life physical behavior.

Read full post
3D PrintingPresentationsValidation

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.

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

Damage Modeling under Impact Loading in Talc-Filled Polypropylene Compounds

by Massimo Nutini6,634 views

Topics covered: Damage in mineral filled polypropylene under impact conditions; damage modeling and parameter identification (prior art, LyondellBasell contributions, debate in the CAE community); experimental and numerical validation; next steps

Read full post
AutomotiveHigh Speed TestingLS-DYNAMaterial SupplierMechanicalPlasticsPresentationsRate DependencyYielding/Failure Analysis