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LFT foam - lightweight potential for semi-structural components through the use of long-glass-fiber-reinforced thermoplastic foams

: Roch, A.; Huber, T.; Henning, F.; Elsner, P.


Altstädt, V. ; American Institute of Physics -AIP-, New York:
29th International Conference of the Polymer Processing Society, PPS 2013. Proceedings : 15–19 July 2013, Nuremberg, Germany
New York, N.Y.: AIP Press, 2014 (AIP Conference Proceedings 1593)
ISBN: 978-0-7354-1227-9
Polymer Processing Society (PPS International Conference) <29, 2013, Nuremberg>
Fraunhofer ICT ()

Investigations on PP-LGF30 foam sandwiches have been carried out using different manufacturing processes: standard injection molding, MuCell® and LFT-D foam. Both chemical and physical blowing agents were applied. Precision mold opening (breathing mold technology) was selected for the foaming process. The integral foam design, which can be conceived as a sandwich structure, helps to save material in the neutral axis area and maintains a distance between load-bearing, unfoamed skin layers. The experiments showed that, at a constant mass per unit area, integral foams have a significantly higher flexural rigidity than compact components, due to their greater area moment of inertia after foaming: with an increase of the wall thickness from 3.6 mm to 4.4 mm compared to compact construction, the flexural rigidity increased by 75 %. With a final wall thickness of 5.8 mm an increase of 300 % was measured. Compared to non-reinforced components that show significant embrittlement during foaming, the energy absorption capacity (impact strength) of LFT foam components remains almost constant.