Materials (RADIOSS One Step)

The Materials panel allows you to specify the properties of the metal to be formed. For the stress strain curve, you can either supply a set of data points or the values for the parameters used in the Krupkowski-Swift hardening law. The altair_mat.db file, located in the bin directory, is a library of materials commonly used in stamping. All the relevant properties for each material are included in this file. You can also create new material libraries in your directory that can be accessed from any HyperForm model file. Select Materials from the Setup menu to display this panel.

Strain hardening is modeled using the Krupkowski-Swift law:

Planar anisotropy is modeled using directional Lankford coefficients, . An average r value is determined from these coefficients using the formula: r= [r0 + 2r45 + r90]/4. Normal anisotropy of the material is modeled using an average plastic strain ratio, r.

r0 = X axis

r90 = Y axis

It is suggested to rotate your part in order to make the rolling direction (r0) coincident with the X axis.

Some material properties can be calculated from other material property values. Those properties are indicated on the panel with an asterisk (*).

Data Type	Input Parameters
String	Material Name
Real	Yield Stress, YS
Real	Tensile Stress, TS
Real	Poisson’s Ratio, nu
Real	Lankford coefficients,
Real	Plastic Strain Ratio, r
Real	Young’s Modulus, E
Real	Strength Coefficient,
Real	Strain-Hardening Exponent, n
Real	Pre-Strain Coefficient,

Note:

The material characteristics are dependent on the unit of length and force chosen for the model. The material database given with HyperForm is consistent with models where length is expressed in millimeters (mm) and force is expressed in newtons (N).

How do I...

1.	Select the create subpanel.

2.	Click material: and enter a new name for the new material.

3.	Toggle to w/o curve.

4.	Enter the values for the material properties.

If the values of K, TS, YS, or e0 are not available, enter 0 in the field(s) and follow the Calculate values for material properties procedure. Properties that can be calculated are indicated with an asterisk (*) on the panel.

5.	Click the right-most create.

This material becomes part of this HyperForm model file.

1.	Select the create subpanel.

2.	Click material: and enter a new name for the new material.

3.	Toggle to w/curve.

4.	Click curves.

5.	Fill the values of strain and stress data using the internal subpanel. To read the curve data from a file, choose the external subpanel and browse to the file.

Note: The first point in the stress-strain curve must be (0,0)

6.	Specify the name of the curve and click create.

7.	Click Display to plot the curve.

8.	Click return to get back to the Materials panel.

9.	Click update to associate the hardening curve with the material created in Step 1.

1.	Select the create subpanel.

2.	Click material: and enter the material to be updated.

3.	Enter new values for Yield Stress (YS), , E, r, n, and .

4.	Click Update.

The material is updated. If the values for and are unavailable, the calculate Second function allows you to calculate those quantities.

1.	Select the calculate subpanel.

2.	Type values for E, n, nu, r0, r45, and r90. The values for , TS, YS, and can be calculated. The minimum required input parameters are listed in the following table:

To calculate:	You must specify:
	, plus TS or YS
TS	, plus or YS
YS	, plus or TS
	YS, plus or TS

3.	Type 0.0 in the field(s) you are calculating.

4.	Click calculate.

HyperForm automatically calculates the material property.

1.	Select the library subpanel.

2.	Click file = and select the material library file from your directory.

By default, the file = field is set to altair_mat.db.

3.	Click load under Materials in file to make the library file available.

4.	Select the create subpanel.

5.	Click Review and select the material to be reviewed from the list.

The values corresponding to the picked material are now displayed in the create subpanel.

1.	Select the library subpanel.

2.	Click file = and select the material library file from your directory.

By default, the file = field is set to altair_mat.db.

3.	Click load under Materials in file to make the library file available.

4.	Select the specific material you want to retrieve.

5.	Use the up and down buttons to scroll through the loaded material library.

6.	Click >> to place it in memory.

This makes it one of the materials for the current HyperForm model file.

1.	Select the library subpanel.

2.	Click file = and enter a name for the new material library file.

3.	Click Reset under Materials in file to clear the column of existing information.

4.	Click the specific material to be added from Materials in memory to the new library file.

5.	Click << to add this material to the new library file.

6.	Click Save to save the new file to your directory.

Materials (RADIOSS One Step)

Materials (RADIOSS One Step)

Materials (RADIOSS One Step)

Data Type

Input Parameters

How do I...

To calculate:

You must specify:

See also