Obtaining a fatigue life prediction for multiaxial loading is a great challenge. This is because the superposition of several loads can cause failure-critical total damage amounts to be reached even at locations which are completely inconspicuous under single loads.
Typical multiaxially loaded components (wheel axles, car body structures, etc.) are subjected to loading from different directions at the same time. The forces applied through braking and acceleration, potholes, etc. apply variable loading to the structure.
Consequently, reliable fatigue analysis requires the use of special solution approaches. The methods applied in this case are based on scientific publications, the most recent in-house developments and research studies conducted in cooperation with leading international institutes. All methods, theories and hypotheses have been and continue to be used and validated successfully in countless projects.
The possible analysis objectives in FEMFAT max include damage or fatigue life, endurance safety factors, static safety factors and degree of multiaxiality, separately for every FE node.
You can choose between ChannelMAX and TransMAX depending on the type of load:
With ChannelMAX, load-time signals are combined with the corresponding stresses from the unit load cases in FEMFAT and are superimposed linearly. This makes the simulation comparable to the situation on the test bench where the component is loaded in several directions at once by servo-hydraulic cylinders.
TransMAX is the module of choice if the sequence of the load cases can be described by transient stress distributions. This means that a separate stress result is available for each point in time of the load history. In contrast to the channel-based approach in ChannelMAX, there is no linear superpositioning here. This makes a fatigue analysis possible even when taking non-linear effects into account in the FE analysis.