Create the materials file "cmas2d.mat". This file stores the physical properties of the material under study for the problem type. In this case, defining the density will be enough.
Enter the materials in the "cmas2d.mat" file using the following format:

MATERIAL: Name of the material (without spaces)
QUESTION: Property of the material. For this example, we are interested in the density of the material.
VALUE: Value of the property
HELP: A help text (optional field)
…
END MATERIAL

In GiD, the information in "cmas2d.mat" file is managed in the materials window, located in Data->Materials.

MATERIAL: Air
QUESTION: Superficial_density#UNITS#
VALUE: 1.01 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL
MATERIAL: Steel
QUESTION: Superficial_density#UNITS#
VALUE: 7850 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL
MATERIAL: Aluminium
QUESTION: Superficial_density#UNITS#
VALUE: 2650 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL
MATERIAL: Concrete
QUESTION: Superficial_density#UNITS#
VALUE: 2350 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL
MATERIAL: Water
QUESTION: Superficial_density#UNITS#
VALUE: 997 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL
MATERIAL: Sand
QUESTION: Superficial_density#UNITS#
VALUE: 1370 kg/m^2
HELP: superficial density assuming a thickness of 1 meter
END MATERIAL

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