I have unconfined concrete cylinder test data of stress vs strain. I need to do abaqus modeling for confined concrete using Drucker Prager. However, the literature I am referring to just says that it implemented a "hyperbolic Drucker–Prager" yield surface. I am searching through the literature and most of them have formulas for "Linear Drucker–Prager". Can anyone help me in this process or guide me to literature that has a hyperbolic Drucker–PragerDrucker Pragerformula that can help me convert my unconfined concrete test data to confined concrete Drucker Prager model with a hyperbolic yield surface?