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Knowmats is an informal repository of information related to materials and simulation. The information helps simulation professionals perform best-in-class simulation with a better understanding of how materials are represented in FEA and simulation. read more...


SAMP-1: A Semi-Analytical Model for the Simulation of Polymers

The numerical simulation of structural parts made from plastics is becoming increasingly important nowadays. The fact that almost any structural requirement can be combined in a lightweight, durable and cost effective structure is the driving force behind its widespread application. More and more structural relevant parts are being constructed and manufactured from plastics. This on the other hand drives the demand for reliable and robust methods to design these parts and to predict their structural behaviour. the key ingredients that need to be available are verified, calibrated and validated constitutive models for any family of plastic material. This holds not only true for crashworthiness applications but for any other application field.

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Plastics Plasticity Rate Dependency Yielding/Failure analysis Automotive Nonlinear Material Models LS-DYNA


Enterprise-Wide Materials Data Management Ensures CAE Fidelity

Virtual product development today has become a complex process involving CAD, FEA, CAE, and physical testing. Material properties form the glue that link the simulation and real life behavior together. Most often, the properties of the materials used in different stages of the product life cycle vary depending on the application. Hence, the engineers and technicians within the enterprise need to have access to not just the simple single point properties that help determine the suitability of a material, but also the more detailed behavioral property data that affect design, simulation and failure analyses. A common platform for the storage and effective deployment of these properties system wide is critical to the efficiency, cost, and quality control through PLM. We present a technology, Matereality that accommodates diverse properties of all the different materials used by an enterprise, its suppliers and collaborators. The cost benefits are immediate, besides improved interoperability and consistency in material data use through the enterprise.

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Matereality Materials Information Management


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

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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Mechanical Plastics Rate Dependency Aerospace and Defense Automotive Consumer Products Material Supplier Toys/Sporting Goods Packaging Home Appliances High Speed Testing Nonlinear Material Models Structural Analysis LS-DYNA Abaqus ANSYS MSC.DYTRAN PAM-CRASH Research Papers


Handbook of Plastics Analysis: Book Review

Assurance of quality in raw materials, control over production, and a basic understanding of criteria for performance all require a sure and complete knowledge of analytical methods for plastics. The present volume organizes the vast world of plastics analysis into a relatively compact form. A plastics engineer will find familiar territory in such subjects as rheometry, differential scanning calorimetry, and measurement of thermal properties. Polymer physicists and chemists will be at home with spectroscopic analyses, liquid chromatography, and nuclear magnetic resonance. All these topics and many more are covered in twelve chapters written by an impressive array of experts drawn from industry and academia.

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Rheology Thermal Plastics Structural Analysis Book Review


Handbook for Plastics Analysis

This book covers some of the most significant techniques used in modern analytical technology to characterize plastic and composite materials.

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Plastics Rubbers Foams Composites


Successful Injection Molding: Book Review

There has been a long standing need for a book that describes the process of injection molding using the insights developed from twenty years of computer aided engineering (CAE). The authors, all veterans of injection molding CAE, have filled this need with their book. "Successful Injection Molding" is a lot more than a book about injection molding CAE. It is clear at this stage that CAE is a tool, which, if well handled, can provide excellent results. That being said, a successful implementer of CAE for injection molding must have a range of insights into the diverse idiosyncrasies of this enormously complex manufacturing process. The book is successful in clearly addressing these issues.

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Injection Molding Book Review


Practical Issues in the Development and Implementation of Hyperelastic Models

Hyperelastic models are used extensively in the finite element analysis of rubber and elastomers. These models need to be able to describe elastomeric behavior at large deformations and under different modes of deformation. In order to accomplish this daunting task, material models have been presented that can mathematically describe this behavior [1]. There are several in common use today, notably, the Mooney-Rivlin, Ogden and Arruda Boyce. Each of these has advantages that we will discuss in this article. Further, we will examine the applicability of a particular material model for a given modeling situation.

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Rubbers Foams Aerospace and Defense Automotive Biomedical Nonlinear Material Models Structural Analysis Abaqus ANSYS SOLIDWORKS MSC.MARC NX Nastran Research Papers


Closing the Gap: Improving Solution Accuracy with Better Material Models 

We discuss open issues in material models for plastics and propose better means of acquiring the right material data for Moldflow simulations using current testing technologies.

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Plastics Material Supplier Mold Maker/Designer Injection Molding Moldflow Presentations


Material Models in Simulation, Part 3: New viscosity models 

We discuss developments in viscosity modeling. New models are not generalized, but are designed to predict expected trends for polymers and incorporate both Newtonian and shear-thinning behavior.

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Plastics Material Supplier Mold Maker/Designer Injection Molding Moldflow Presentations


Understanding the Role of Material Properties in Simulations, Part 2

We discuss material properties in injection molding simulations, including the definition of property requirements, identification of evaluation parameters, and the role of material properties at each stage of the injection molding process, from mold filling through cooling, post-filling and shrinkage/warpage considerations.

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Plastics Material Supplier Mold Maker/Designer Packaging Injection Molding Moldflow Moldex3D Cadmould C-MOLD Presentations