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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...


Thermoplastic Material Testing for Use in SIGMASOFT

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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Plastics Electonics/Electrical Injection Molding Nonlinear Material Models Structural Analysis SIGMASOFT Presentations


A Simplified Approach for Strain-Rate Dependent Hyperelastic Materials with Damage

"Simulation of rubber-like materials is usually based on hyperelasticity. If strain-rate dependency has to be considered viscous dampers are added to the rheological model. A disadvantage of such a description is timeconsuming parameter identification associated with the damping constants. In this paper, a tabulated formulation is presented which allows fast generation of input data based on uniaxial static and dynamic tensile tests at different strain rates. Unloading, i.e. forming of a hysteresis, can also be modeled easily based on a damage formulation. We show the theoretical background and algorithmic setup of our model which has been implemented in the explicit solver LS-DYNA [1]-[3]. Apart from purely numerical examples, the validation of a soft and a hard rubber under loading and subsequent unloading at different strain rates is shown."

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Mechanical Rubbers Hyperelastic Rate Dependency Yielding/Failure Analysis Automotive High Speed Testing LS-DYNA Research Papers


Datapoint Newsletter: Spring '09, Volume 15.1

DatapointLabs Featured in Technical Conferences.

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Plastics Rubbers Foams Hyperelastic High Speed Testing Nonlinear Material Models LS-DYNA Abaqus Newsletters


Datapoint Newsletter: Summer '08, Volume 14.2

New Tests and TestPaks. New Presentations On-line.

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LS-DYNA Altair RADIOSS VISI Flow Newsletters Validation


Datapoint Newsletter: Spring '12, Volume 18.2

Technical Note: On the Conditioning of Plastics Prior to Testing. Expansion of Conditioning Capabilities.

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Newsletters


Datapoint Newsletter: Fall '08, Volume 14.4

A Makeover for DatapointLabs.

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Rheology Thermal Mechanical Newsletters


Datapoint Newsletter: Summer '11, Volume 17.2

New Lab Space & Equipment

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Mechanical Newsletters


Methodology for Selection of Material Models for Plastics Impact Simulation 

The volume of plastics that are subjected to impact simulation has grown rapidly. In a previous paper, we discussed why different material models are needed to describe the highly varied behavior exhibited by these materials. In this paper, we cover the subject in more detail, exploring in depth, the nuances of commonly used LS-DYNA material models for plastics, covering important exceptions and criteria related to their use.

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Plastics Aerospace and Defense Automotive Consumer Products Material Supplier Industrial Goods Packaging Nonlinear Material Models Structural Analysis LS-DYNA Abaqus ANSYS PAM-CRASH Altair RADIOSS Research Papers


Datapoint Newsletter: Fall '11, Volume 17.3

Expansion: New Lab Space, New TestPaks. DIGIMAT MX Reverse Engineering Update.

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Mechanical DIGIMAT PAM-COMFORT Newsletters


Cold Runner Design - Getting the whole picture matters

The profitability of a molded rubber product depends to a large extent on the mold efficiency. To achieve the maximum productivity, besides the larges possible number of cavities it is desirable to minimize the rubber consumption and to produce parts without defects.

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Rheology Rubbers Automotive Biomedical Injection Molding SIGMASOFT Newsletters