We are specialized in the simulation of highly non-linear and
dynamic short-term processes such as sheet forming and impacts
for crash, passenger and pedestrian protection scenarios.
In our simulations, we focus on the realistic
representation of material behaviour.
Therefore, the characterisation of material data
usually complements our simulations projects.
For every project, we determine the simulation method that suits the task
at hand best. We consider which programs you use
to make sure that solutions can later be applied at your company.
A good mesh, a good material model and a good material
card are prerequisites for a predictive simulation, but usually, the model
must also be preprocessed to include local properties:
Most materials are not isotropic, so the primary
direction of anisotropy must be determined.
Finally, the production process of a part causes local differences of the
material behaviour. Accounting for those differences can improve the accuracy of
the simulation. Information on the local distribution can be taken from
experiments or, more commonly, from process simulations.
Some examples for locally different behaviour are:
Application: Short-fibre reinforced polymers
Thermoplastics with short glass fibres are used
in the front end and interior of cars and other vehicles. They
play a significant role in assessing occupant and
The short fibres align themselves during the mould-injection process.
Where the fibres are aligned in the same direction, the local behaviour
is orthotropic. In regions where the fibres have no predominant alignment
the local behaviour is isotropic. The hardening and fracture characteristics
in these zones is markedly different.
Therefore, the local distribution of fibres should be carried
over from injection simulations so that the behaviour can be interpolated
according to the degree of anisotropy.
The elasto-plastic behaviour varies not only locally according to the
fibre distribution and with the load angle, but also with the stress state.
MF GenYld can model this with anisotropic hardening.
The elastic behaviour is dependent on the local fibre direction and on
the strain rate.
A special model for anisotropic fracture can take into account
the strong direction dependence of ductile fracture in regions
of high degrees of anisotropy.
In addition, endless fibre-reinforced thermoplastics can also fail under
brittle fracture, which CrachFEM can assess with a stress-based
A suite of modelling tools
MATFEM can help you to incorporate such effects into your simulation models.
Our material model CrachFEM uses the lock-and-key principle to turn the
process data into a local distribution of material behaviour.
We can prepare the data and run the simulations of your
We provide utility programs to “unlock” the data from
stamping simulations, one-step solvers for stamped parts
and filling simulations of mould-injections.
We provide utility programs to initialize the orientation
of elements and element layers.