# Material Object

Material object holds material property information for the structure.\
Examples of these properties are modulus of elasticity, Poisson's ratio, density, steel yield strength, 28-day strength of concrete.

**Example Syntax:**

```
...
<O T="Material">
...
...
</O>
```

**Example:**

```xml
<O N="MaterialObject1" T="Project" Category="FEM Objects" TransAlignRule="Right">
    <!-- created by ParamML Examples on 06.02.2023 -->
    <O N="Rebar3D" T="Line">
        <O T="Point" X="0" Y="0" Z="0" />
        <O T="Point" X="0" Y="0" Z="100" />
        <O N="Section" T="Section">
            <O T="Shape">
                <O T="Circle" Radius="5" />
            </O>
        </O>
        <O N="StructuralSteel_A36" T="Material">
            <P N="E" V="200000" D="modulus of elasticity" />
            <P N="G" V="83333" D="shear modulus" />
            <P N="Fu" V="400" D="specified minimum tensile strength" />
            <P N="Fy" V="248" D="specified minimum yield stress" />
        </O>
    </O>
</O>
```

![](https://openbrim.atlassian.net/wiki/download/attachments/2161967166/image-20230206-083340.png?api=v2) To view this example in the library, see (<https://openbrim.org/platform/?application=inc&author=ParamML_Examples_OpenBrIM+Platform&folder=FEM+Objects&obj=objidn5fh3j5s10n96gn4x1cv0t>)

**Example:**

To use material values saved in the OpenBrIM library , follow these steps:

* Open a saved project from the OpenBrIM App. - Click on the Data , then navigate to Materials under FEA in the combobox. - In the 3rd line, click on the 3 dots, then select the "import material" button in the combobox. - Choose the desired material components. - Import the information. - Navigte to the Source Code. ![](https://openbrim.atlassian.net/wiki/download/attachments/2161967166/image-20230207-112345.png?api=v2) ![](https://openbrim.atlassian.net/wiki/download/attachments/2161967166/image-20230207-111414.png?api=v2) The code rows in the red frame in the figure are copied from the Source Code and transferred to the library object for processing

```xml
<O N="MaterialObject2" T="Project" Category="FEM Objects" TransAlignRule="Right">
    <!-- created by ParamML Examples on 07.02.2023 -->
    <O N="Fc_4ksi" T="Material">
        <P N="E" V="3986.54846" UT="Stress" UC="Property" />
        <P N="G" V="1661.06185819275" UT="Stress" UC="Property" />
        <P N="d" V="0.0000868055" UT="Density" UC="Property" />
        <P N="a" V="0.000006" D="Alpha: The coefficient of thermal expansion property of the material." />
        <P N="Type" V="Concrete" T="Text" D="Type: The material type [Steel=steel/Concrete=concrete/Reinforcement Bar=rebar/Prestressing Tendon=prestress]." />
        <P N="Fc28" V="4" UT="Stress" UC="Property" />
        <P N="f_cm" V="5.16" UT="Stress" UC="Property" />
    </O>
    <O N="Fc_3ksi" T="Material">
        <P N="E" V="3625.494616" UT="Stress" UC="Property" />
        <P N="G" V="1510.62275685933" UT="Stress" UC="Property" />
        <P N="d" V="0.0000868055" UT="Density" UC="Property" />
        <P N="a" V="0.000006" D="Alpha: The coefficient of thermal expansion property of the material." />
        <P N="Type" V="Concrete" T="Text" D="Type: The material type [Steel=steel/Concrete=concrete/Reinforcement Bar=rebar/Prestressing Tendon=prestress]." />
        <P N="Fc28" V="3" UT="Stress" UC="Property" />
        <P N="f_cm" V="4.16" UT="Stress" UC="Property" />
    </O>
</O>
```

To view this example in the library, see (<https://openbrim.org/platform/?application=inc&author=ParamML_Examples_OpenBrIM+Platform&folder=FEM+Objects&obj=objiduf5e7mmq9em21sv551ob>)

**Parameters of Material Object:**

| **Label**                | **Mandatory** | **Name and Type Attributes** | **Default Description and Value Attributes**                                                                        | **Other Attributes**                    |
| ------------------------ | ------------- | ---------------------------- | ------------------------------------------------------------------------------------------------------------------- | --------------------------------------- |
| Modulus of Elasticity    | No            | N="E"                        | D="Modulus of Elasticity" V="0"                                                                                     | Role="Input" UT="Stress" UC="Material"  |
| Poisson Ratio            | No            | N="Nu"                       | D="Poisson's Ratio" V="0.2"                                                                                         | Role="Input"                            |
| Density                  | No            | N="d"                        | D="Density" V="0.2"                                                                                                 | Role="Input" UT="Density" UC="Material" |
| Alpha                    | No            | N="a"                        | D="Coefficient of Thermal Expansion" V="0"                                                                          | Role="Input"                            |
| Steel Yield Stress       | Yes           | N="Fy"                       | D="Steel Yield Stress" V="0"                                                                                        | Role="Input" UT="Stress" UC="Material"  |
| Steel Ultimate Stress    | Yes           | N="Fu"                       | D="Steel Ultimate Stress" V="0"                                                                                     | Role="Input" UT="Stress" UC="Material"  |
| Concrete 28-day Strength | Yes           | N="Fc28"                     | D="Concrete 28-day Strength" V="0"                                                                                  | Role="Input" UT="Stress" UC="Material"  |
| Type                     | No            | N="Type" T="Text"            | D="The Material Type \[Steel=steel/Concrete=concrete/Reinforcement Bar=rebar/Prestressing Tendon=prestress]." V="0" | Role="Input"                            |