Materials in simulation

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Materials Data Workflow for Simulation of Composites in Transportation Applications

by DatapointLabs6,369 views

Multi-scale material models are being increasing applied for high level simulation of complex materials such as UD layups, fabric laminate composites, fiber-filled plastics. These models require data inputs from a variety of material tests which are then assembled into models used in the finite element solvers. We present an infrastructure for the digitalization of such information, where the required material data are collected including a process for maintaining traceability and consistency of the source data. Information about the compositional characteristics and processing history are captured. Built-in software modules or external client tools can be used for calibration of material models with the resulting material file linked to the source data. The accuracy of the reduced order model can be checked by running a validation simulation against a physical test. Models can be published and released into a master CAE materials library output where they can be used to model such materials for a variety of target solvers. This process improves the reliability and accuracy of composites simulation.

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Aerospace and DefenseAutomotiveCompositesMaterials Information ManagementPresentationsStructural Analysis

Progress on the Validation of Simulation for Ductile Polymers

by Hubert Lobo6,352 views

We will focus on our work related to the testing, modeling and validation of simulation for crash and durability applications, including testing techniques, software tools for material parameter conversion, and the use of a mid-stage validation process that uses standardized experiments to check the accuracy of the simulation prior to use in real-life applications. In addition, we present a short introduction to the Knowmats initiative which seeks to collect posts and links to papers from industry experts as a reference for simulation professionals.

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AutomotiveHigh Speed TestingMechanicalNonlinear Material ModelsPlasticsPresentationsStructural AnalysisUniversal CrashValidation

Material Modeling Strategies for Crash and Drop Test Simulation

by DatapointLabs6,282 views

Many LS-DYNA models are used for plastics 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.

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ANSYSAbaqusAerospace and DefenseAutomotiveConsumer ProductsHigh Speed TestingIndustrial GoodsLS-DYNAMSC.DYTRANMaterial SupplierMetalsNonlinear Material ModelsPAM-CRASHPackagingPresentationsStructural Analysis

Material Modeling and Mold Analysis 

by DatapointLabs6,248 views

We present a perspective on material modeling as applied to mold analysis requirements. Melt-solid transitions and the case for a unified material model are discussed, along with prediction of post-filling material behavior and shrinkage, and the impact of viscous heating on flow behavior and material degradation.

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Aerospace and DefenseAutomotiveBiomedicalBlow MoldingCAE Vendor/SupplierCompositesConsumer ProductsElectonics/ElectricalEnergy and PetroleumExtrusionFoamsGelsHome AppliancesIndustrial GoodsInjection MoldingMetalsMoldflowNonlinear Material ModelsOils/LubricantsPackagingPlasticsPresentationsRubbersWaxes

Theoretical Development of an Orthotropic Elasto-Plastic Generalized Composite Material Model

by Paul Du Bois6,226 views

The need for accurate material models to simulate the deformation, damage and failure of polymer matrix composites is becoming critical as these materials are gaining increased usage in the aerospace and automotive industries. While there are several composite material models currently available within LS-DYNA, there are several features that have been identified that could improve the predictive capability of a composite model. To address these needs, a combined plasticity and damage model suitable for use with both solid and shell elements is being developed and is being implemented into LS-DYNA as MAT_213. A key feature of the improved material model is the use of tabulated stress-strain data in a variety of coordinate directions to fully define the stress-strain response of the material. To date, the model development efforts have been focused on creating the plasticity portion of the model. The Tsai-Wu development efforts have focused on creating the plasticity portion of the model. The Tsai-Wu composite failure model has been generalized and extended to a strain-hardening based orthotropic material model with a non-associative flow rule. The coefficients of the yield function, and the stresses to be used in both the yield function and the flow rule are computed based on the input stress-strain curves using the effective plastic strain as the tracking variable. The coefficients in the flow rule are computed based on the obtained stress-strain data. The developed material model is suitable for implementation within LS-DYNA for use in analyzing the nonlinear response of polymer composites.

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Aerospace and DefenseAutomotiveCompositesHigh Speed TestingLS-DYNAMechanicalPlasticityResearch PapersValidationYielding/Failure Analysis