MF GenYld + CrachFEM is:

The material model MF GenYld describes the elasto-plastic deformation of the material. It can model many physical effects of plasticity and allows to model a wide range of materials.

The failure model CrachFEM uses the calculated stresses and deformations to assess various modes of ductile and brittle failure, either as post-processing value or transiently with element elimination and post-critical models.

MF GenYld + CrachFEM can be coupled to various explicit finite-element solvers. Support for implicit solvers is in progress.

- The material model MF GenYld describes the elasto-plastic deformation of the material.

- The elastic behaviour of most materials is isotropic, but orthotropic and strain-rate dependent elasticity are important to model polymers correctly.

- Strain-rate dependent hardening is a basic requirement for modelling nearly all materials. The hardening can also depend on temperature or other locally distributed values such as hardness or the degree of anisotropy.

- A variety of base yield criteria cover a wide range of materials, especially sheet metals. These base yield criteria can be scaled for different stress states and they can be different in tension and compression.

- Isotropic-kinematic hardening can describe the Bauschinger effect where the yield stress changes after load reversal.

- Some polymers cannot be considered incompressible. The compressibility module can model volume changes under plastic deformation.

- With a few exceptions, the elasto-plastic behaviour of the material can be modelled consistently with shell and solid elements.

- The failure model CrachFEM describes the onset of material failure. It includes:

- Failure is evaluated as failure risk, which can be used as criterion for element elimination. If statistical data is available, failure probabilities can be assessed.

- CrachFEM distinguishes between the ductile fracture modes normal fracture due to microvoids under tensile loads and shear fracture due to shear band localization. These models are complemented by optional post-critical models.

- Thin-walled metal parts are subject to tensile instability. The instability itself does not constitute failure. Post-instability models can model the subsequent fracture.

- A stress-based fracture criterion can model brittle fracture in metals or polymers. In glass and ceramics, this is the only fracture mode.

- Depending on the material, damage accumulation can be linear or tensorial. In addition, there is a true anisotropic fracture model that determines the fracture direction.

- Porosity in castings contributes to a higher risk against normal fracture. The porosity can evolve during the simulation starting from an initial porosity.

- CrachFEM can model the material throughout process chains by mapping results from one stage to the next.

- Local variations in the material behaviour of manufactured parts can be accounted for with suitable initialization methods.

MF GenYld + CrachFEM is mature and has a broad user base. The material and failure models are under steady development. New features are being integrated according to our experience with industry and research projects.

MF GenYld + CrachFEM is complemented by a rich ecosystem of utilities:

- The graphical material browser MF View lets you scan the input data quickly. It can convert material cards between formats and unit systems interactively or in batch mode.

- The utility MF Crypt encrypts material data sets of MF GenYld + CrachFEM, so that their contents cannot be read or modified.

- The command-line utilities MF Orient and MF Interproc help you with defining a suitable orientation distribution for your mesh and with preparing element state data for the inclusion of local effects.

- We are in contact with our customers, with preprocessor vendors and with creators of third-party software to make the integration of MF GenYld + CrachFEM seamless in your simulation environment.