Viscoelastic
Does anyone know how ABAQUS calculate ALLCD (viscoelastic energy dissipation)
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Hi,
I am doing some study with viscoelastic energy dissipation. I have a basic question for ABAQUS.
In ABAQUS, I notice there is a function to calculate Energy dissipated by creep, swelling, and viscoelasticity (ALLCD). You are able to plot energy change with time.
But want to know how ABAQUS calculates energy dissipation with time? What equation does it use?
Transversely Isotropic Viscoelastic Material
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I am looking for a viscoelastic model for transversely isotropic materials with applications in geomechanics. I also look for the material properties and viscoelastic coefficients for one or two TIV material. Can any one help me?
Online finite element analysis of nanoindentation (indentation)
Dear All,
We (the NanoBIO Node at Illinois ) have a preliminary release of an online finite element analysis of nanoindentation (indentation) tool using FEAP .
This preliminary release is limited to linear elastic material, axisymmetric geometry, spherical rigid indenter, and various boundary conditions.
Mechanical characterization and micromechanical modeling of bread dough. J.Rheol [http://dx.doi.org/10.1122/1.4768463]
The mechanical behavior of dough, gluten, and
starch was studied in an effort to investigate whether bread dough can be
treated as a two phase (starch and gluten) composite material. Mechanical
loading tests revealed rate-dependent behavior for both the starch and the
gluten constituents of dough. There is evidence from cryo-scanning electron
microscopy that damage in the form of debonding between starch and gluten
occurs when the sample is stretched. In addition, the Lodge material model was
found to deviate from the tension and shear stress-strain test data by a
Hyperelastic and Viscoelastic material modelling
I have a doubt regarding the Hyperelastic and Viscoelastic material modelling in ANSYS using Mooney-Rivlin material constants.
ANSYS theory manual says that for large deformation and large strains, the material modelling (i.e. constitutive behaviour) is same for hyperelastic and viscoelastic. Is it so?
Generally, Mooney-Rivlin material constants are used to model Hyperelastic behaviour (rubber-like materials).
thermoplastic material
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Tunable electrical and mechanical responses of PDMS and polypyrrole nanowire composites
Journal of Physics D: Applied Physics
Ping Du, Xi Lin, Xin Zhang
Volume 46, Number 19, Page 195303
doi:10.1088/0022-3727/46/19/195303
A generic experimental procedure is presented in this work to enhance
the electrical responses of polydimethylsiloxane (PDMS) through
incorporation of conducting polymer nanowires, while maintaining the
desirable mechanical flexibility of PDMS. The conducting polypyrrole
Investigation of Cellular Contraction Forces in the Frequency Domain Using a PDMS Micropillar-Based Force Transducer
Journal of Microelectromechanical Systems
Ping Du; Chen Cheng; Hongbing Lu; Xin Zhang
Volume: 22, Issue: 1, Page(s): 44 - 53
DOI: 10.1109/JMEMS.2012.2213070
viscoelastic material characterization and modeling
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Hi,
I used TA DMA tested the viscoelastic material properties (stress relaxation test). When I did Time-Temperature Superposion to create the mater curve, i found some of the shift-X values were negative (those points after Tg), which cannot be fit to WLF function. ANybody knows the reason behind this? I excluded those point when fit the WLF coefficients, is this acceptable?
And I found the C1 and C2 of one material are negative, can i still use it at high temperature? thank you