RHEA
(Rheology Analysis) 
Updates
Version 1.2.1  July 11, 2011
Allow mores Anton Paar data sets to be analyzed. In
addition, the software now outputs a file with a GKM extension
than can be used with the STP  simulate test pulse 
software. This allows users to look a what happens in a
repeated creep test  with the assumption of linear
viscoelastic properties.
Version 1.1.9  May 25, 2011
Corrects a problem with phase angles of 90 degrees or greater
being reported in some data files resulting in a program
crash.
Version 1.1.8  May 24, 2011
Corrects a problem with data not being saved in correct
temperature order for some *.apr formats when converted to *.ttd
files.
Version 1.1.7  May 16, 2011
This Rhea version enables four file formats generated by three
versions of Anton Paar RHEOPLUS/32 software, versions V2.81,
V3.21, V3.31, to be read by the RHEA software. Export the data
from the software which will be in a "csv" format
(comma separated file). After the data has been exported
change the extension of the file from ".csv" to
".apr." The ".apr" identifies to RHEA that
an Anton Paar file format is expected.
Version 1.0.8  July 20, 2010
This Rhea version completes the following updates:
1 RightClick context menu on MasterCurve plots has a new
item "View MC data". The shifted observed data
points (or equivalent pseudopoints) within the mastercurve
are listed and can be copied to the clipboard. Thus numerical
values of complex modulus, phase angle, dynamic viscosities
etc of the mastercurve can be inspected and saved.
2
The formulae for the discrete spectra Storage and Loss Modulli
have been included with the spectra listing (besides those of
the Relaxation Modulus and Creep Compliance).
3
Mastercurve at Tref added to Accessible Region plot.
4
Several bugs fixed related to use of radians per sec vs. Hz
frequency measure in the data input. These caused some results
of analysis of rad/sec data to be inconsistent with analysis
of same test input as Hz data. Specifically:
a)
Oberst damping optimum temperature
b)
Y axis annotation of dynamic viscosity
c)
Magnitude of some listed Discrete Spectra components
d)
some values in the properties dialog  Relaxation modulus,
Creep log log slope, Dynamic viscosity.
5
Properties dialog split into two sections, first for Time
domain (transient) and second for Frequency domain (dynamic)
properties, to clarify how time and frequency inputs are
applied.
6
Two additional properties: Apparent stiffness and Loss Dynamic
viscosity.
7 Properties dialog now responds to Windows "Show
Desktop" command.
Version 1.0.7  May 17, 2010
This Rhea version corrects some software bugs but more
importantly now includes the Kaelble modification to the WLF
Shift factors.
Version 1.0.4  March 18, 2010
This Rhea version corrects an error that occurs with HMA
mixture data files when a slow loading data point is added to
the highest temperature isotherm. This is just an exe file
replacement. Make sure you have installed the 1000 version
software before replacing the exe. A new full install package
will be available in the next week with some new additional
features.
The version add to 1.0.2 that was added the previous week to
correct and improve Anton Par file handling.
Version
1.0.0  Jan 2, 2010
Changes [from v.0.9.9999] for Rhea v.1.0.0 2010Jan02
The changes made relate just to technical correctness of the Discrete Spectrum
Listing, as follows.
1) In the Discrete Spectrum Listing, there were unbalanced parentheses in the
LogisticFit equations.
2) In the Discrete Spectrum Listing, the time constants of the elements of the
Generalized Kelvin Model were incorrectly referred to as Relaxation times
whereas they are actually Retardation times.
Version
0.9.9998  April 21, 2009
The
current version of RHEA™ Software is updated to
0.9.9998
It
was noted that the modified CA fit to G* data alone was not always
working whereas a fit was always provided for G' G" data.
This version was updated to correct that a results in the program giving
a CA fit in all known cases for the G* alone. The type of fit is
the CAS version of the CA equation  which is a three parameter fit with
a variable glassy modulus.
Version
0.9.9997  September 30, 2008
MechanisticEmpirical
Pavement Design Guide
In preparation for the introduction of the MEPDG work has been conducted
to represent the output of mixture data in this format. Two windows
provide this data  first using the polynomial shifting the shift is
represented in the standard logistic sigmoid used in the MEPDG.
Frequency is converted to time using the approximate relationship and E*
is the expressed as a function of loading time.
A second
expression of the results is provided under the listing of the output.
The model used in the MEPDG is called the "standard logistic."
In addition to the fitting parameters a measure of the fit is provided
via the root mean square analysis. The expression given in this equation
is in terms of frequency which is the rheologically correct manner of
expressing E* data.
Alternate
Sigmoid
In addition to the sigmoid in the MEPDG format an alternate format is
provide as the Richards curve. In some cases this is expressed as a
limiting Gompertz curve. These sigmoid allow for nonsymmetrical sigmoid
formats more typical of asphalt materials. In addition, Abatech has
found that this type of expression more correctly accounts for the
behavior of polymer blends and those with significant filler volume.
Solid
vs. Liquid Analysis
Additional functionality has been provided allowing the user for force
either a viscoelastic solid or liquid analysis (partly dependent upon
data) along with the calculation of discrete relaxation and retardation
spectra.
Oberst
Analysis
The Oberst test is used in industries concerned with damping properties.
The Oberst results can be calculated from a frequency sweep
analysis/master curve thus allowing prediction of this test data at
different frequencies and temperatures.
File Formats
We have been working with the integration of Signal data from both IPC
and Interlaken data sets to produce analysis of material master curves.
IPC data
 RHEA will handle IPC data  sum files in the file reader.
TA data  If TA data is exported from TA software in a prescribed manner
then RHEA will handle this in the file reader to make a ttd file.
Various
other updates have been made
 WLF is
allowed with grater or equal three isotherms
 Pairwise
shifting graphs are provided
 G* or
E* can be used alone to produce shifted curve  with a calculated
phase angle from the discrete spectra fit
Planned
Updates for 2009
 Additional
work will be conducted on the VE solid master curve fitting.
 Further
evaluation of Kaelble shift factor
