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Thermoplastic Material Testing for Use in SIGMASOFT and the Effect of Moisture on PA 6/6

by DatapointLabs5,817 views

Thermoplastic materials are one of the largest categories of materials to be injection molded. Moisture-sensitive materials can lead to issues in the molding process. Simulation of the injection molding process requires sophisticated and exact material properties to be measured. This presentation discusses the testing required to characterize a thermoplastic material for use in SIGMASOFT, as well as the effects of moisture on viscosity measurement of a moisture-sensitive material. Consequences of basing designs on wet or dry materials are covered. Implementation of material data into the software to produce a successful injection molding simulation simulation is described.

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CAE Vendor/SupplierInjection MoldingNonlinear Material ModelsPlasticsPresentationsRheologySIGMASOFT

Matereality Webinar: Finite Element Analysis of Additively Manufactured Products

by Altair Engineering6,416 views

With the growing interest in additive manufacturing in the aerospace industry, there is a desire to accurately simulate the behavior of components made by this process. The layer by layer print process appears to create a morphology that is different from that from conventional manufacturing processes. This can have dramatic impact on the material properties, which in turn, can affect how the material is modeled in simulation. We tested an additively manufactured metal part for mechanical properties and validated the material model used in a linear static simulation.

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3D PrintingAerospace and DefenseAltair RADIOSSCAE Vendor/SupplierMechanicalPresentationsStructural AnalysisValidation

Development, implementation and Validation of 3-D Failure Model for Aluminium 2024 for High Speed Impact Applications

by Paul Du Bois6,141 views

FAA William J Huges Technical Center (NJ) conducts a research project to simulate failure in aeroengines and fuselages, main purpose is blade-out containment studies. This involved the implementation in LS-DYNA of a tabulated generalisation of the Johnson-Cook material law with regularisation to accommodate simulation of ductile materials.

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Aerospace and DefenseAutomotiveHigh Speed TestingLS-DYNAMechanicalMetalsPresentationsRate DependencyValidationYielding/Failure Analysis

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.

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AbaqusBlow MoldingDIGIMATExtrusionInjection MoldingLS-DYNAMechanicalNonlinear Material ModelsPlasticsPresentationsStructural AnalysisThermoforming

Thermoplastic Material Testing for Use in SIGMASOFT

by DatapointLabs6,067 views

Thermoplastic materials are one of the largest categories of materials to be injection molded. Simulation of the injection molding process requires sophisticated and exact material properties to be measured. This presentation will discuss the testing required to characterize a material for use in SIGMASOFT, as well as the significance of material model parameters. Differences in testing methodology for amorphous and semi-crystalline polymers will be covered, along with step-by-step implementation into the software to produce a successful injection molding simulation simulation.

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Electonics/ElectricalInjection MoldingNonlinear Material ModelsPlasticsPresentationsSIGMASOFTStructural Analysis

Validation of Simulation Results Through Use of DIC Techniques 

by DatapointLabs6,167 views

It has long been desired to quantify the accuracy of simulation results. Through developments in digital image correlation (DIC) techniques, it is now possible to quantify the deviation between simulation and real life experimentation. In this paper, three-dimension DIC measurements of deformed parts are compared to deformed surfaces predicted in simulation. Using DIC, it is possible to import deformed surface elements from simulation and map the magnitude of deviation from the measurements of the actual deformed shape.

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ANSYSHigh Speed TestingNonlinear Material ModelsPresentationsStructural AnalysisValidation

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