Summary — Lesson 4

This brings us to the end of this series. Let us review what we learned in this course.  In this course, we covered the curve-fitting method and the response function method for characterizing elastomeric materials with hyperelasticity — namely, understanding how to convert experimental data for use in simulation.  Because hyperelasticity is associated with large strains and, thus, possible distortion of elements, we also helped you to address such situations if they arise.

How to Perform Curve-fitting for Hyperelastic Material Models — Lesson 1

• Curve-fitting is used for calibrating hyperelastic models based on experimental data.
• It is recommended to use single element models in testing the material model.

How to Set Up Response Function for Hyperelastic Material Models — Lesson 2

• The Response Function Hyperelastic option is designed to utilize the experimental stress-strain data directly during the constitutive calculation.
• The response function method requires that experimental data completely envelop the entire strain range of interest and should ideally include the dominant stress states encountered in the actual application.

How to Handle Element Distortion Errors in Hyperelastic Materials — Lesson 3

• Ensure mesh quality is good, which may include using elements less susceptible to distortion, using a mesh with appropriately shaped elements, or applying the loads in smaller increments.
• Ensure that the model is set up correctly, which includes ensuring that we have complete test data, a stable material model, proper contact settings, and design geometry.