Add Nonlinear Material Data
Specify plastic material data for use with a nonlinear analysis.
If you have chosen to use an elastic-plastic material model, nonlinear material data is required. At a minimum, you must specify the measured tensile stress-strain data for angles of 0 and 90 degrees when using a filled material. If you wish to capture the compressive response, you must also specify the measured compressive stress-strain data for these two angles. To specify the nonlinear data:
Click
(Material > Add > Add Nonlinear Material).
At this point, you have four options to import material data:
- Browse for a *.csv file which contains the nonlinear stress-strain data
- Copy and paste data from a *.csv file into the dialog using the paste button
- Copy and paste data from an Excel file into the dialog using the paste button
- Drag-and-drop a *.csv file onto the dialog
Note: The keyboard shortcut Ctrl+V is not supported for pasting data at this time.Specify the appropriate units for your data. Stresses may be entered in MPa or psi, strain may be entered as % strain or unitless, temperatures can be entered in Kelvin, Celsius, or Fahrenheit, and angles can be entered in radians or degrees.
Click Plot Data to view the idealized curves that will be used in the structural analysis. Refer to the Plot Data section below for more details on the visualization functionality.
Click OK to return to the Material tab.
Data Requirements
Advanced Material Exchange only supports data entry at angles of 0, 45, and 90 degrees. Data for each angle must contain at least 15 data points, with at least one point in the elastic range of the material. Scientific format is not supported. All data must be in decimal format.
The nonlinear data should be in the order of stress, strain, angle, temperature, relative humidity, and strain rate. The data may be delimited with commas, semi-colons, colons, or tabs. If you do not have data for each column, you may leave it blank by using consecutive delimiters.
Nonlinear data for both filled and unfilled materials must have all six columns of data present. The angle column is ignored for unfilled materials. If you attempt to import data with fewer columns of data than required, you will receive an error. Recall that you can use consecutive delimiters if you do not know all of the required properties.
At the bottom of the dialog, click Add Material Test Information to enter details about the physical testing process.
Plot Data
Use the Plot Data button to visualize the measured data and the idealized data produced by Advanced Material Exchange. These visualizations are useful to compare the idealized representation of the material with the measured data. If you have both tensile and compressive data, both sets of data are shown on the plot.
If you have data characterized at multiple environments (temperature, humidity, or strain rate), you must select the environment you wish to use for the analysis (one tensile and one compressive). At this time, Advanced Material Exchange does not interpolate between environments. If you have multiple environments, the plot will update as you switch from one environment to the next.
Import Models with Old Ramberg-Osgood Data
When importing a Moldflow model that contains Ramberg-Osgood data from a previous release, you can choose to re-optimize the material using the previously saved stress-strain data. After importing the Moldflow and structural models you will see a message asking if you would like to re-optimize the material. Selecting 'Yes' will immediately re-optimize the material. Selecting 'No' will allow you to proceed using the existing Ramberg-Osgood data.