# Materials

CivilFEM has a materials library, which can be selected through the material. Materials properties (listed in the Script Manual) can also be changed; these are organized through "containers".
- **Steel**: to create a steel material it is necessary de code and the name.

```{code-block}
createSteelMat("EC3"," EC3_Fe360")
```

To change structural steel properties, for example, name, Poisson ratio or thicknesses proceed as follows:

```{code-block}
Material("Fe360").Name = "SteelMat"
Material("SteelMat").Poisson = 0.5
Material("SteelMat").Thicknesses[1] = Double(0.15,"m")
```

It can be also parameterized as below:

```{code-block}
m = Material("Fe360")
m.Name = "Mat.Example"
m.Poisson = 0.5
m.Thicknesses[1] = Double(0.15, "m")
```

- **Concrete**: this material is divided in three different ways: concrete, reinforcement steel and prestressing steel. To create a concrete material is necessary the code and the material. As optional argument, the name of the entity can be placed.

```{code-block}
createConcreteMat("EC2"," EC2_C12")
createReinfMat("S400","EC2","EC2_S400")
createPrestMat("ECEN10138","EN10138_Y1570C")
```

To change concrete properties, for example, Poisson ratio, cracking or damping coefficients proceed as follows:

```{code-block}
m = Material("C12/15")
m.Poisson = 0.3
m.CrackingProperties.CrackingYN = True
m.DampingProperties.AutocalculateRayleigh = False
m.DampingProperties.AlphaRayleigh = Double(1,"Sec_Inv")
```


- **Rock**: to create rock material is needed to set Rock Type, Rock Subtype, Rock Class and Name, all possible arguments are listed in Script Manual.

createRockMat("Sedimentary","Siliceous","Aggregated","Flint")


To change rock properties, for example, Poisson ratio, cracking or damping coefficients proceed as follows:

```{code-block}
m = Material("Flint")
m.ElastMod = Double(25000,"Pa")
m.Poisson = 0.2
```

- **Soil**: CivilFEM provides a list of possible soil materials, all included in the Script Manual.

```{code-block}
createSoilMat("Peat low plasticity")
```

To change soil properties, for example, Poisson ratio, cracking or damping coefficients proceed as follows:

```{code-block}
m = Material("Peat low plasticity")
m.ElastMod = Double(200000,"Pa")
m.Poisson = 0.35
```

- **Generic**: if you prefer to create an own material, use the generic material, in this command is needed the Elastic modulus, Poisson ratio, Density and the linear thermal expansion coefficient.

```{code-block}
# Name,ElastMod,Poisson,Density,ThExpans
createGenericMat("GenMat", 2500, 0.3, 1200, 0)
```

To change generic material properties, for example, Shear modulus or damping, proceed as follows:

```{code-block}
m = Material("GenMat")
m.ShearModulus = Double(52000,"Pa")
m.DampingProperties.AutocalculateRayleigh = False
m.DampingProperties.AlphaRayleigh = Double(5,"Sec_Inv")
```