June 09, 2015 | by PolyXtrue | views 2667
For two low-density polyethylenes and two polystyrenes,
axisymmetric and planar elongational viscosities
are estimated using entrance loss data from capillary
and slit rheometers, respectively. The elongational viscosity
is estimated by optimizing the values of various
parameters in the Sarkar–Gupta elongational viscosity
model such that the entrance loss predicted by a finite
element simulation agrees with the corresponding experimental
data. The predicted entrance loss is in good
agreement with the experimental data at high flow
rates. The difference in the experimental and predicted
entrance loss at lower flow rates might have been
caused by large error in the experimental data in this
range.
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Rheology
Plastics
Extrusion
PolyXtrue
Research Papers
June 09, 2015 | by PolyXtrue | views 2342
The elongational viscosity model proposed by Sarkar and Gupta (Journal of Reinforced Plastics and Composites 2001, 20, 1473), along with the Carreau model for shear viscosity is used for a finite element simulation of the flow in a capillary rheometer. The entrance pressure loss predicted by the finite element flow simulation is matched with the corresponding experimental data to predict the parameters in the elongational viscosity model. To improve the computational efficiency, various elongational viscosity parameters are optimized individually. Estimated elongational viscosity for a Low Density Polyethylene (DOW 132i) is reported for two different temperatures.
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Rheology
Plastics
Extrusion
PolyXtrue
Research Papers
June 09, 2015 | by PolyXtrue | views 2394
A new elongational viscosity model along with the
Carreau-Yasuda model for shear viscosity is used for a
finite element simulation of the flow in a capillary
rheometer. The entrance pressure loss predicted by the
finite element flow simulation is matched with the
corresponding experimental data to predict the parameters
in the new elongational viscosity model.
...read full post
Rheology
Plastics
Extrusion
Injection Molding
PolyXtrue
Research Papers
June 09, 2015 | by PolyXtrue | views 2595
A new elongational viscosity model along with the Carreau-Yasuda model for shear viscosity is
used for a finite element simulation of the flow in a capillary rheometer die. The entrance pressure loss
predicted by the finite element flow simulation is matched with the corresponding experimental data to
predict the parameters in the new elongational viscosity model. For two different polymers, the
predicted elongational viscosity is compared with the corresponding predictions from Cogswell’s
analysis and K-BKZ model.
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Rheology
Plastics
Extrusion
PolyXtrue
Research Papers
April 29, 2015 | by Patrick Cunningham | views 2767
This demonstration showing how to analyze plastic parts using finite element analysis was given by Patrick Cunningham at CAE Associates' Accurate FEA of Engineering Plastics seminar, held on October 14, 2014 in Tarrytown, NY.
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Plastics
Plasticity
Presentations
April 29, 2015 | by Datapoint Newsletters | views 2927
Validation is Focus of DatapointLabs Technical Presentations, New Combined Loading Compression Test for Composite Materials, Matereality Software for Your Product Development Team
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Plastics
Newsletters
April 28, 2015 | by Matereality | views 6014
TPM has posted this 3 minute video on how to use the SolidWorks Materials Portal
Mechanical
Metals
Structural Analysis
SOLIDWORKS
April 28, 2015 | by Hubert Lobo | views 2414
High strain-rate properties have many applications in the simulation of automotive crash and product drop testing. These properties are difficult to measure. Previously, we described a novel inferential technique for the measurement of the properties of polycarbonate. In this paper, we demonstrate that the technique appears to work for a variety of polymers. We also show that plastics exhibit different kinds of high-strain rate behaviors
Plastics
LS-DYNA
April 28, 2015 | by DatapointLabs | views 3196
There is interest in quantifying the accuracy of different material models being used in LS-DYNA today for the modeling of plastics. In our study, we characterize two ductile, yet different materials, ABS and polypropylene for rate dependent tensile properties and use the data to develop material parameters for the material models commonly used for plastics: MAT_024 and its variants, MAT_089 and MAT_187. We then perform a falling dart impact test which produces a complex multi-axial stress state and simulate this experiment using LS-DYNA. For each material model we are able to compare simulation to actual experiment thereby obtaining a measure of fidelity of the simulation to reality. In this way, we can assess the benefits of using a particular material model for plastics simulation.
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Mechanical
Plastics
Rate Dependency
LS-DYNA
Research Papers
Validation
April 28, 2015 | by Paul Du Bois | views 2467
"The simulation of rubber materials is becoming increasingly
important in automotive crashworthiness simulations.
Although highly sophisticated material laws are available in
LS-DYNA to model rubber parts, the determination of material
properties can be non-trivial and time consuming. In many
applications, the rubber component is mainly loaded uniaxially
at rather high strain rates. In this paper a simplified material
model for rubber is presented allowing for a fast generation of
input data based on uniaxial static and dynamic test data."
...read full post
Mechanical
Rubbers
Hyperelastic
Rate Dependency
Automotive
High Speed Testing
LS-DYNA
Research Papers
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