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Supplements
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Stereonet for Mac/PC, by Rick Allmendinger. A program for spherical projection of directional datasets. Go to the original source at http://www.geo.cornell.edu/geology/faculty/RWA/RWA.html where you will find the latest versions of the program and other information. StereoNett for Windows, by Johann Duyster. A program for spherical projection of directional datasets. Click here to download your copy or go to the original source at http://homepage.ruhr-uni-bochum.de/Johannes.P.Duyster/stereo/stereo1.htm where you will find updates and extra information. An alternative program is Wintek, which can be downloaded here. For a basic unzip routine, download pkunzip.exe or use any version of winzip. |
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StressMohr
for Windows, by Ulrich Kruse. This program illustrates the use of stress
calculations for two-dimensional systems. The program consists of five displays.
In each display you can vary the physical situation and immediately see the effects
in the graphical displays. The first display illustrates the relation between forces
and stresses acting on a rectangular solid. In the second display, you explore the
stress on a plane as you vary the orientation of the plane and the state of stress
in the system. We illustrate the calculation of the stress on the plane in terms
of a simple matrix multiplication in the third display. You can also observe the
simple geometry of the envelope of the stresses that are produced as the angle of
the plane is varied. The fourth display shows the behavior of the normal and shear
components of the stress on the plane. When the normal component is plotted along
x and the shear component along y, the envelope will be a circle: called a Mohr
circle. This beautiful result lets you visualize the range of possible stresses
on the plane. Finally in the last display, you can explore the conditions which
lead to the fracture of a sample: you can vary the stresses until the stresses are
just strong enough to cause fracture by watching the changes in size and location
of the Mohr circle. Click here to download the zipfile that contains the program and a MSWord version of the manual. The manual is also available online by clicking here. |
| Strain Calculator (0<Wk<1) for W95, by Rod Holcombe. Strain Calculator presents strain data and calculations graphically and numerically. Conversions of strain ratios to stretches at a given volume change can be plotted directly onto a logarithmic strain plot (see screen shot). Shear zone parameters (ellipticity, deformed and undeformed orientations, etc.) for any shear strain value or vorticity number (Wk) are calculated and shown graphically. Please note use restrictions. |
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