Fiber reinforced plastics are the logical means to reduce weight in automotive structures or vehicles, which are more efficient when less mass has to be moved. Additionally the infinite long fibers are in use for covers, sheet structures and cabin parts - design meet functionality. All these new designs have to be approved by fatigue analyses like their metal counterparts before. How and by which technological means this can be carried out in APA product FEMFAT is shown in this presentation. Data preparation is using also Converse by PART engineering from APA.
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Improved Inter-/Extrapolation of Material Parameter s
In FEMFAT input of 2 material parameter sets for 2 different orientation degrees parallel and perpendicular to fiber orientation ⇒⇒⇒⇒ Linear/Log inter-/extrapolation
Specimen Tests performed at University of Leoben,Prof. Eichlseder
• Summary:– Fiber orientation and temperature have a big influence on fatigue life– S-N curves have been measured for short fiber reinforced polymers– There is no endurance limit, fixation of fatigue limit at 10 million cycles– A fatigue life prediction method has been developed for orthotropic materials based on
a critical plane criterion– Different FE-meshes require mapping of material data and fiber orientation
• Outlook– Automatic detection of joint lines– Torsion– Creep, stress relaxation– Ageing– Methods for estimation of material parameter
• Summary:– ChannelMAX– ABAQUS-interface– Assessment of shell elements with COMPOSITE property– No assessment of interlaminar stresses σ3, τ31, τ32
– The maximum damage over all plies and stress components defines the type of failure– FEMFAT visualizer: Visualization of results for each layer (damage, amplitude and
mean stress, S-N curve, failure mode, etc.)
• Outlook– Assessment of delamination by considering interlaminar stresses σ3, τ31, τ32
– Support of solid elements with composite properties– New interfaces (Nastran, Ansys, etc.)