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Section 5
5-129
5.26.1 The Define Material Command
Purpose
This command may be used to specify the material properties by
material name. Then assign the members and elements to this
material name in the CONSTANTS command.
General format:
DEFINE MATERIAL
ISOTROPIC name
or
2DORTHOTROPIC name
⎧E ⎫ f
1
f
2
⎪G ⎪ f
1
⎪POISSON ⎪ f
1
⎨DENSITY ⎬ f
1
⎪ALPHA ⎪ f
1
f
2
⎪
DAMPING ⎪ f
1
⎩
CDAMP
⎭
f
1
Repeat ISOTROPIC or 2DORTHOTROPIC name and values for as
many materials as desired then:
END MATERIAL (DEFINITION)
Name material name (name of up to 36 characters).
E specifies Young's Modulus.
G specifies Shear Modulus. Enter only for beams &
plates and when Poisson would not be 0.01 to
0.499.
POISSON specifies Poisson's Ratio. If G is not entered, then
this value is used for calculating the Shear
Modulus (G=0.5xE/(1+POISSON)). Must be 0.01
to 0.499. Poisson must be entered for orthotropic
See next
command for
example