Using Automatic Differentiation to Implement a Family of Material Models

Virtlab is a virtual material testing laboratory that works with a variety of material models. These materials specify functions as part of their definition, some of which must be differentiated for use in the simulator. Virtlab can be extended with new models by the user, and as a result all functions needed will not be known at development time. To prevent the user from calculating large error-prone expressions by hand, general purpose …