EHTC 2009

Latest Improvements in FEMFAT to Simulate Reality

Axel Werkhausen, MagnaPowertrain

Fatigue analysis has many famous founders – engineers with industrial/practical background like August Wöhler or Milton Miner, and also theoretical specialists working in laboratories and universities like Prof. Harald Zenner, Prof. Erwin Haibach, Prof. Huseyin Sehitoglu – to list some living persons, too.

The software FEMFAT combines both – the theoretical approaches and investigations from cooperation with universities and practical know how from physical tests in the fatigue laboratory in ECS from projects in automotive, railway and other mechanical problems.

So to consider new aspects for reduced or improved life of components made from iron, steel, aluminium, sinter or fibre reinforced plastics (more to come) the software uses an inverse approach of german FKM guideline. This guideline enables engineers with fatigue problems to judge a specific location in their component by aspects of surface roughness (-), surface treatments (+), ambient temperature (-), testing intervalls,… on material curves – all collected and summarized in a manual with a step by step to dispense.

The software FEMFAT utilizes these approaches and adds some investigated effects for production processes like mold casting of fibre reinforced plastics; nearly pore free boundary layers on cast iron parts; secondary dendrite arm spacing (SDAS) from aluminium castings; Neuber corrections for linear elastic stress results to be accessable.

The interfirm cooperation with european OEMs and our customers worldwide improves the software day by day. The capabilities of actual version 4.7 (4.8 is defined to be released with November 2009) can be reviewed at


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