Create Material with Strain Rate Dependency

This tutorial helps in creating and validating solver cards with critical material properties.

The AMM accounts for strain rate effects, a feature important for materials that respond differently at different loading speeds (rate-dependent materials). Higher strain rates often produce stiffer material responses, while lower rates allow for more deformation before failure. By inputting strain rate data, the software can simulate real-world material behavior under varying conditions, essential for accurate predictive modeling.

Step 1: Import Raw Material Data

  1. Launch AMM and select Elastoplastic.
  2. Configure the file path for material data using Basic Settings.
  3. Import raw material data, such as stress-strain curves, either from a local file system or AMDC database. Upload multiple material models data with various strain rates.
    Figure 1. Import Raw Material Data

    Import Raw Material Data

Step 2: Assign Strain Rate to Each Curve

  1. Click Advanced from the Create Material Card section.
    Figure 2. Create Material Card

    Create Material Card
  2. Select LAW for the selected curve. For this example, I choose Radioss LAW36 and then edit the required values.
  3. Select Copy & Move from the Select Strain Build.
    Figure 3. Assign Strain Rate

    Assign Strain Rate
  4. To assign Strain Rate for each curve, select the curve fit data and select the required strain rate.
  5. Click . The selected strain rate is applied to the curve and is displayed.
  6. Use the Fitting slider to adjust the material model parameters to fit the strain curves to original test data.
    Figure 4. Data Fitting Slider

    Data Fitting Slider
  7. Adjust the Adiabatic Coefficient slider to the desired value.
    Figure 5. Adiabatic Coefficient

    Adiabatic Coefficient

    In AMM, while generating a solver card, this coefficient is used to describe how the material reacts to temperature changes without heat exchange with the environment, which is critical for capturing realistic behavior under high strain rates or rapid deformation.

Step 3: Create and Review CAE Solver Card

  1. Click Create Card. The generated solver card is saved in the set Current Working Directory path. For more information refer to Basic Settings
    Figure 6. Create Solver Card

    Create Solver Card
  2. Open the generated CAE ready solver card and review the card details for:
    Figure 7. CAE-ready Solver Card

    CAE-ready Solver Card
    • Accuracy of stress-strain behaviour.
    • Check the strain rate and adiabatic parameters are correct for the simulation environment.
    • Verify the solver card compatibility with the target CAE software.
  3. Edit the solver card as required and save the changes.