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

June 3, 2016by DatapointLabs9,870 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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Using an Intermediate Validation Step to Increase CAE Confidence

May 24, 2016by DatapointLabs7,360 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

A Standardized Mechanism to Validate Crash Models for Ductile Plastics

June 13, 2016by DatapointLabs7,342 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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Automotive High Speed Testing LS-DYNA Mechanical Packaging Plastics Rate Dependency Research Papers Toys/Sporting Goods Validation Yielding/Failure Analysis

A Robust Methodology to Calibrate Crash Material Models for Polymers

May 11, 2009by DatapointLabs6,875 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

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

April 28, 2005by DatapointLabs6,760 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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ANSYS Abaqus Aerospace and Defense Automotive Consumer Products High Speed Testing Home Appliances LS-DYNA MSC.DYTRAN Material Supplier Mechanical Nonlinear Material Models PAM-CRASH Packaging Plastics Rate Dependency Research Papers Structural Analysis Toys/Sporting Goods

High Speed Stress Strain Material Properties as Inputs for the Simulation of Impact Situations

October 22, 1997by DatapointLabs6,392 views

With the recent changes in the crashworthiness requirements for US automobiles for improved safety, design engineers are being challenged to design interior trim systems comprised of polymeric materials to meet these new impact requirements. Impact analysis programs are being used increasingly by designers to gain an insight into the final part performance during the design stage. Material models play a crucial role in these design simulations by representing the response of the material to an applied stimulus. In this work, we seek to develop novel test methods to generate high speed stress-strain properties of plastics, which can be used as input to structural analysis programs...

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

Material Modeling Strategies for Crash and Drop Test Simulation

November 27, 2007by DatapointLabs6,280 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

Material Modeling and Mold Analysis

May 16, 2008by DatapointLabs6,247 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

Characterization and Modeling of Non-linear Behavior of Plastics

November 15, 2006by DatapointLabs6,057 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

Methodology for Selection of Material Models for Plastics Impact Simulation

September 21, 2006by DatapointLabs5,994 views

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