How to define a Material model in Femap?

1. Model Material



2. Define Material


3. Material Type

FEMAP supports eight types of materials:


These material formulations allow you to simulate different material characteristics.

FEMAP supports four regular material types and a general tabular data type:
1. Isotropic: Constant properties in all directions. All properties entered as a single value.
2. Orthotropic (Both 2-D and 3-D): Material properties are direction dependent. Parameters defined in two planar directions or three principal directions.
3. Anisotropic (Both 2-D and 3-D): Similar to Orthotropic except more general. Specify parameters as a general 3x3 (2-D) or 6x6 (3-D) elasticity matrix.
4. Hyperelastic: Materials subject to large deformations, such as rubber. Input distortional and volumetric deformation or stress/strain data. Limited solver support - many solvers do not support this material type - check your solver before using this material type.
5. General (Other Types): Solver specific types - LS-Dyna, MARC, Abaqus, NX Nastran, and MSC Nastran. Refer to solver documentation for uses and variables.

Isotropic, orthotropic, and anisotropic materials can also have nonlinear material properties associated with them. You set the type of nonlinearity (Linear Elastic, Elastic/Plastic, or Plastic) and input material data such as yield stress and stress-strain curves.

Copying Materials

If you need to create a material that is similar to another in your model, you do not have to enter all of the material values manually. Pressing the Copy button will display a list of all existing materials. When you choose a material from the list, the material values will be copied from that material and displayed in the current material creation dialog box. You can then modify those values in any way you want, or even change your mind and copy a different material, before pressing OK to create the new material.

If you copy a material of one type into a material of a different type, FEMAP automatically converts the material to the new type. The material constants are converted to a form which represents the material which you copied. For example, copying an isotropic material to a 3D orthotropic material will result in stiffness values which are identi­cal in all three directions, that is isotropic. If you copy the other direction, 3D orthotropic to isotropic, there is no way to represent the orthotropic nature of the material and that information will be lost. You should review care­fully any materials which you copy between different types.

Working with Material Libraries

Material libraries allow you to create standard materials that you can use over and over again in many different models. When you press Save, the current material is added to the material library file. Pressing Load will display a list of the materials in the library and let you choose one to be loaded into the material creation dialog box. Just like Copy, you can then modify the values before pressing OK to create the material. Also, just like Copy, when you load a material of a different type it is automatically converted. The material ID, Color, Layer and Coordinate Sys­tem are not saved in the library, nor updated when a material is loaded from the library.


4. Load Material From Library


FEMAP also has a library of material types. Although by no means complete, the material library shipped with FEMAP does contain common materials with their respective properties derived from the U.S. Government’s MIL-HDBK-5. This library is designed to demonstrate that a material library can be maintained. Many companies prefer to enter their own material properties and structural allowable than accept ones provided from any outside source. Any time you create a new material in FEMAP, and wish to save that material to the library, press the Save button in the material creation dialog box.

Through the File, Preferences, Libraries command in FEMAP, you can load a different material library than the one that is shipped with FEMAP. This makes it possible for a company with multiple FEMAP users to post a material library on the network that all users can access to obtain the “approved” material properties and allowable. This is also true of all other libraries in FEMAP including the property library.

5. Choose Library


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