Material Insights by CAE Type

LS-DYNA

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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.

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AbaqusDIGIMATInjection MoldingLS-DYNAMoldex3DMoldflowNonlinear Material ModelsPlasticsPresentationsRate DependencySIGMASOFTSimpoe-MoldStructural AnalysisUniversal MoldingValidationViscoelastic

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

by DatapointLabs5,965 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

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.

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LS-DYNAMaterealityMechanicalPapersPresentationsRate DependencyYielding/Failure Analysis

Using Mid-stage Validation to Increase Confidence in Simulation of TPOs

by DatapointLabs6,168 views

Finite element analysis of plastics contains assumptions and uncertainties that can affect simulation accuracy. It is useful to quantify these effects prior to using simulation for real-life applications. A mid-stage validation uses a controlled physical test on a standardized part to compare results from simulation to physical experiment. These validations do not use real-life parts but carefully designed geometries that probe the accuracy of the simulation; the geometries themselves can be tested with boundary conditions that can be simulated correctly. In one study, a quasi-static three-point bending experiment of a standardized parallel ribbed plate is performed and simulated, using Abaqus. A comparison of the strain fields resulting from the complex stress state on the face of the ribs obtained by digital image correlation (DIC) vs. simulation is used to quantify the simulation's fidelity. In a second study, a dynamic dart impact experiment is validated using LS-Dyna probing the multi-axial deformation of a polypropylene until failure.

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AbaqusAutomotiveLS-DYNAMechanicalPlasticsPresentationsStructural AnalysisValidation