Material Input Window
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The material properties window is where the user assigns the
various properties to the material(s) used in the analysis. The number
of materials is currently limited to five, but this can be increased if
a customer requests it.
There are two types of materials the user can input into CCDS,
constant (temperature independent) material properties or temperature dependent
material properties. These two material types will save and load to a *.mat
file for constant material properties and to a *.mtt file for a temperature
dependent material property file.
The number of materials used in
the analysis is entered on the top left/center. The drop
down menu gives known material properties for common systems (there
are currently over 60 common isotropic and composite systems included in
the latest version of WIND. The Apply to material option
has a number to the right. By pressing the Apply button
the material properties selected in the drop down menu are applied to that
particular material ID.
The load and save button can be used to load and save a material
to a *.mat file in their currently working directory. The program will
load and save a material pertaining to the Material ID being selected.
In the window shown above, clicking the save button will save mat. ID 1
to a *.mat file while clicking the load button will populate Mat ID 1 with
the material properties from your *.mat file.
All materials can be can be edited, loaded and saved while
the program is running to actively explore potential materials for the
cylinder design being studied. You will be "warned" in the error
window (bottom right on main window) if there is an empty cell in
this table. Some Empty cells can cause crashes depending on the property
left empty. For example an empty stiffness value will cause the program
to stop running, and prompt the user to enter a positive value in this
column.
The above window shows the materials section in temperature
independent mode. The window below shows the program when temperature dependent
materials are selected. The user can input up to 7 temperature set points
with known material properties and the program will use linear interpolation
to determine the various material properties at
Click on the thumbnail for larger image
Material Property
table
The following are the inputs used for the constant material
property window. All units are imperial units. (Metric units can be used
if all units throughout the program are input in metric form)
E11: Stiffness of material in the principle (1) direction
(psi).
E22: Stiffness of material in the principle (2) direction (psi).
v12: Poisson's Ratio in 1-2 direction. Remaining Poisson's ratios
are calculated using reciprocal relationship for anisotropic material
systems.
alpha L: Coefficient of thermal expansion in the (1) direction
(in/ oF)
alpha T: Coefficient of thermal expansion in the (1) direction
(in/ oF)
rho: Material density (lb/in3)
Tg: Glass transition temperature (oF)
F1T: Tensile strength of material in principle (1) direction
(psi).
F1C: Compressive strength of material in principle (1) direction
(psi).
F2C: Tensile strength of material in principle (2) direction
(psi).
F2T: Compressive strength of material in principle (2) direction
(psi).
F6: Shear strength of material in principle (1-2) direction
(psi).
e1T: Strain to failure in (1) direction.
e2T: Strain to failure in (2) direction.
Notes: The most important point to remember about
the material properties window is that Material ID 1 represents the bore material.
If the composite overwrap thickness is zero, this represents the only material
being used. On the other hand if the steel thickness is set to zero then
the tube is simply represented by material ID's 2 thru 5. Please note,
the program will function normally even if the user has more materials
input in this tab than are actively being used in the tube.