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Challenges in the Modeling of Plastics in Computer Simulation

by DatapointLabs7,435 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

A Robust Methodology to Calibrate Crash Material Models for Polymers

by DatapointLabs7,054 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

A Novel Technique to Measure Tensile Properties of Plastics at High Strain Rates

by DatapointLabs6,933 views

High strain-rate properties have many applications in the simulation of automotive crash and product drop testing. These properties are difficult to measure. These difficulties result from inaccuracies in extensometry at high strain rates due to extensometer slippage and background noise due to the sudden increase in stress at the start of the test. To eliminate these inaccuracies we use an inferential technique that correlates strain to extension at low strain rates and show that this can be extended to measure strain at higher strain rates

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ANSYSAbaqusAerospace and DefenseAutomotiveConsumer ProductsHigh Speed TestingHome AppliancesLS-DYNAMSC.DYTRANMaterial SupplierMechanicalNonlinear Material ModelsPAM-CRASHPackagingPlasticsRate DependencyResearch PapersStructural AnalysisToys/Sporting Goods

Mechanical Properties of Polymers and Composites, 2nd Edition: Book Review

by DatapointLabs5,650 views

This book presents a valuable resource for engineers and designers seeking to apply structural analysis and other advanced methods to the design of plastic parts. The reader learns what to expect for the mechanical properties of polymers and develops a grasp of how plastics respond to various applied stress conditions. The book introduces mechanical tests and polymer transitions, moving onward into chapters on elastic behavior, creep and stress relaxation, dynamic mechanical properties, stress- strain behavior and strength, It also covers abrasion, fatigue, friction and stress cracking. Additionally, the effects of fillers and fibers on these properties are considered.

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Book ReviewCompositesMechanicalPlasticsStructural Analysis