The 2022 release in Non Linear mechanics introduces quite a few new material models in many well known areas such as hyperelasticity, creep etc. The in depth mathematical representation of these models is beyond the scope of this blog. The user can refer to the documentation of 2022 release for more details.

• Valanis Landel model: This is a new hyperelastic model very similar to the Marlow model so just the uniaxial test data is enough for the model. Unlike Marlow model, this model accepts test data in both tensile and compressive directions. It supports both compressible and incompressible elastomers.

• Material properties as state variable: Many properties in Abaqus can be defined as a function of field variables such as temperature. User can now associate a field variable with a scalar values material point quantity. This feature can be used to define plasticity with different behavior in tension and compression. 2021xFD04
• Adhesive Curing: This material model has been developed in collaboration with 3M. This model can be used in conjunction with the viscoelastic model. This model also accounts for heat generation during the curing process. 2021xFD06.

• Concrete damage plasticity enhancement: This model has been used in standard and explicit to model concrete and other brittle materials. The model now supports B31 beam elements in space. 2022xFD01
• Extrapolation behavior: While defining piecewise linear plasticity, cyclic hardening etc., Abaqus does not extrapolate outside the data range. Beginning 2022xGA, it is possible to linearly extrapolate the material behavior beyond the last point definition. The default behavior however is constant by default.

Plasticity Corrections: For those familiar with the Fe-Safe product, the Neuber plasticity correction is not a surprise. This feature is used to account for local plasticity in Fatigue without using stress-strain pairs. The Neuber and Glinka plasticity corrections have been introduced in Abaqus as well to account for local plasticity in the perturbation step. 2022xFD01