The calibration data processing options enable you to clean up your material data before using it to define material behaviors. The following options are available:
Convert
Scale
Smooth
Truncate and Shift
The Convert option enables you to convert the data in a calibration data set from nominal form to true form or vice versa. Abaqus/CAE performs the conversion using the algorithms described in “Stress and strain measures” in “Inelastic behavior,” Section 23.1.1 of the Abaqus Analysis User's Guide.
To convert calibration data between nominal and true forms:
In the Model Tree, click mouse button 3 on the data set that you want to convert and select Process from the menu that appears.
The Data Set Processing dialog box appears.
Select Convert, and click Continue.
The Change Data Set Form dialog box appears.
Select the form to which you want to convert the selected data set. Options are Nominal (Engineering) Form and True Form.
If desired, you can retain the original data set and create a new data set when you perform the data conversion. You can also customize the name of the newly created data set.
Click OK.
Abaqus/CAE performs the selected form conversion for the data.
The Scale option enables you to apply different scaling factors to either column in a calibration data set.
To scale calibration data:
In the Model Tree, click mouse button 3 on the data set that you want to convert and select Process from the menu that appears.
The Data Set Processing dialog box appears.
Select Scale, and click Continue.
The Scale Data Set dialog box appears.
Specify a scaling factor for either column in the data set by editing the values in the Col 1 or Col 2 fields.
If desired, click Preview to review the new data values created by the scaling factor values.
Abaqus/CAE reflects the new scale factor for each column in the data set.
If desired, you can retain the original data set and create a new data set when you perform the data conversion. You can also customize the name of the newly created data set.
Click OK.
Abaqus/CAE performs the selected scaling for the data.
The Smooth option enables you to operate on a calibration data set to produce data that has a smoother curve. The resulting data set has the same X-coordinate values as the original data set. Abaqus/CAE uses an exponential moving average algorithm to smooth the data; this algorithm is also used by the smooth2 X–Y operator. For more information, see “Smoothing an X–Y data object,” Section 47.4.31.
To smooth calibration data:
In the Model Tree, click mouse button 3 on the data set that you want to convert and select Process from the menu that appears.
The Data Set Processing dialog box appears.
Select Smooth, and click Continue.
The Smooth Data Set dialog box appears.
In the Weight field, specify a value for the smoothing parameter. You can specify a smoothing factor between 0 and 1 for the curve; a smaller value produces a smoother curve. The default smoothing factor is 0.75.
If desired, you can retain the original data set and create a new data set when you perform the data conversion. You can also customize the name of the newly created data set.
Click OK.
Abaqus/CAE smooths the data set.
The Truncate and Shift option enables you to exclude data points from a calibration data set whose X-coordinate values are less than or greater than a user-specified value or to include data points that lie between two specified X-coordinate values.
To truncate and shift calibration data:
In the Model Tree, click mouse button 3 on the data set that you want to convert, and select Process from the menu that appears.
The Data Set Processing dialog box appears.
Select Truncate and Shift, and click Continue.
The Truncate Data Set dialog box appears.
Specify a truncation point on the left side or the right side of the data set, or specify points on both sides of the data set. You can set a truncation point by dragging a slider in the viewport or by entering a value in the appropriate X-axis field.
Shift the selected subset of data points using either of the following techniques:
Toggle on Offset first point to (0,0) to shift the selected subset of data points so that its leftmost point resides at (0,0).
Shift the selected subset of data points along either axis by specifying values in the Offset X-axis or Offset Y-axis fields.
If desired, you can retain the original data set and create a new data set when you perform the data conversion. You can also customize the name of the newly created data set.
Click OK.
Abaqus/CAE performs the specified truncation or shift.