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A Standardized Mechanism to Validate Crash Models for Ductile Plastics

June 13, 2016by DatapointLabs7,341 views

Quantifying simulation accuracy before running crash simulations could be a helpful confidence building measure. This study continues our development of a mechanism to validate material models for plastics used in modeling high-speed impact. Focusing on models for isotropic materials that include options for rate dependency and failure, we explore other models commonly used for ductile plastics including MAT089 and MAT187.

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Determination and Use of Material Properties for Finite Element Analysis: Book Review

June 3, 2016by DatapointLabs9,869 views

This book is intended to be a companion to the NAFEMS book, "An Introduction to the Use of Material Models in FE". It informs Finite Element Analysis users of the manner and methodologies by which materials are tested in order to calibrate material models currently implemented in various FEA programs. While the authors seek first to satisfy the basic material models outlined in the companion book, they make important extensions to FEA used in currently active areas including explicit simulation.

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ANSYS Abaqus Aerospace and Defense Altair RADIOSS Automotive Biomedical Book Review Building Materials CAE Vendor/Supplier Consumer Products DIGIMAT Energy and Petroleum Foams Furniture High Speed Testing Home Appliances Hyperelastic Industrial Goods LS-DYNA MSC.DYTRAN MSC.MARC MSC.NASTRAN Material Supplier Mechanical Metals NX Nastran Nonlinear Material Models PAM-COMFORT PAM-CRASH Packaging Plasticity Plastics Rate Dependency Research Laboratory Rubbers SIMULIA SOLIDWORKS Structural Analysis Viscoelastic Yielding/Failure Analysis

Using an Intermediate Validation Step to Increase CAE Confidence

May 24, 2016by DatapointLabs7,359 views

Simulations contain assumptions and uncertainties that a designer must evaluate to obtain a measure of accuracy. The assumptions of the product design can be differentiated from the ones for the solver and material model through the use of a mid-stage validation. An open loop validation uses a controlled test on a standardized part to compare results from a simulation to the physical experiment. From the validation, confidence in the material model and solver is gained. In this study, the material properties of a polypropylene are tested to characterize for an *ELASTIC *PLASTIC model in ABAQUS. A validation of a quasi-static three-point bending experiment of a parallel ribbed plate is then performed and simulated. A comparison of the strain fields resulting from the complex stress state on the face of the ribs obtained by digital image correlation (DIC) vs. simulation is used to quantify the simulation's fidelity.

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Abaqus Automotive Biomedical Consumer Products Furniture Home Appliances Material Supplier Nonlinear Material Models Packaging Plasticity Plastics Research Papers Structural Analysis Toys/Sporting Goods Validation

Understanding and Coping with Material Modeling Limitations in FEA

July 21, 2010by DatapointLabs5,790 views

The limitations of modeling materials for simulation are discussed, including lack of clarity in material model requirements, gaps between the material data and the model to which it will be fitted, issues in obtaining pertinent properties, difficulties in parameter conversion (fitting), and preparation of input files for the software being used. Means to address these limitations are presented, including understanding the model completely, measuring the correct data with precision on the right material, selecting the best model for the data and ensuring the best fit of the model to the data, validating the model against a simple experiment, and following best practices to create an error-free input file.

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Aerospace and Defense Automotive Biomedical Consumer Products Electonics/Electrical Foams Home Appliances Industrial Goods Material Supplier Packaging Plastics Presentations Rubbers Toys/Sporting Goods

A Robust Methodology to Calibrate Crash Material Models for Polymers

May 11, 2009by DatapointLabs6,874 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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ANSYS Abaqus Aerospace and Defense Altair RADIOSS Automotive Consumer Products High Speed Testing Home Appliances Industrial Goods LS-DYNA MSC.DYTRAN Material Supplier Mechanical Nonlinear Material Models PAM-CRASH Packaging Plastics Research Papers Structural Analysis

Selecting Material Models for the Simulation of Foams

April 13, 2009by DatapointLabs5,918 views

We seek to lay down a framework to help us understand the different behavioral classes of foams. Following a methodology that we previously applied to plastics, we will then attempt to propose the right LS-DYNA material models that best capture these behaviours. Guidelines for model selection will be presented as well as best practices for characterization. Limitations of existing material models will be discussed.

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ANSYS Abaqus Automotive Consumer Products Foams High Speed Testing Home Appliances LS-DYNA MSC.DYTRAN Material Supplier Nonlinear Material Models Packaging Research Papers Structural Analysis

Simulating Plastics in Drop and Crash Tests

July 17, 2008by DatapointLabs5,658 views

If you want a crash simulation involving plastics to yield useful results, it is important to model the material behavior appropriately. The high strain rates have a significant effect on the properties, and failure can be ductile or brittle in nature, depending on a number of factors.

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ANSYS Abaqus Aerospace and Defense Altair RADIOSS Automotive Biomedical Consumer Products High Speed Testing Industrial Goods LS-DYNA MSC.DYTRAN Material Supplier Nonlinear Material Models PAM-CRASH Packaging Plastics Research Papers Structural Analysis Toys/Sporting Goods

Material Modeling and Mold Analysis

May 16, 2008by DatapointLabs6,246 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 Defense Automotive Biomedical Blow Molding CAE Vendor/Supplier Composites Consumer Products Electonics/Electrical Energy and Petroleum Extrusion Foams Gels Home Appliances Industrial Goods Injection Molding Metals Moldflow Nonlinear Material Models Oils/Lubricants Packaging Plastics Presentations Rubbers Waxes

Material Modeling Strategies for Crash and Drop Test Simulation

November 27, 2007by DatapointLabs6,279 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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ANSYS Abaqus Aerospace and Defense Automotive Consumer Products High Speed Testing Industrial Goods LS-DYNA MSC.DYTRAN Material Supplier Metals Nonlinear Material Models PAM-CRASH Packaging Presentations Structural Analysis

Characterization and Modeling of Non-linear Behavior of Plastics

November 15, 2006by DatapointLabs6,056 views

A considerable amount of CAE today is devoted to the simulation of non-metallic materials, many of which exhibit non-linear behavior. However, most material models to date are still based on metals theory. This places severe restrictions on the proper description of their behavior in CAE. In this paper, we describe non-linear elastic behavior and its interrelationship with plastic behavior in plastics. Special attention is given to the differentiation between visco-elastic (recoverable) strain and plastic (non-recoverable) strain. The goal of this work is to have a material model for plastics that can describe both loading and unloading behavior accurately and provide an accurate measure of damage accumulation during complex loading operations.

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Abaqus Aerospace and Defense Automotive Biomedical Consumer Products Home Appliances Material Supplier Nonlinear Material Models Packaging Plastics Research Papers Rubbers Structural Analysis Toys/Sporting Goods