Rozdziały

Stały URI dla kolekcjihttp://hdl.handle.net/11652/4411

Przeglądaj

Teraz wyświetlane 1 - 2 z 2

Experimental study of the tack of flax fibers based thermoplastic composite reinforcements
(Wydawnictwo Politechniki Łódzkiej, 2022) Joannes, Mathieu; Gautier, Karine; Arnold, Gilles; Wang, Peng
In this article we tested a flax fibres and polypropylene based composite reinforcement in order to determine its adherence to other surfaces around the melting temperature of polypropylene at 165°C. A rheometer with a thermal chamber is used to do a probe-tack test at a constant temperature. This test consists in three steps, the compaction of the sample between two tabs, the relaxation and the separation of the upper tab from the sample. Tackiness corresponds in the traction force measured during the separation. No tackiness was measured during our first tests although we could observe residue on tab surfaces. Further tests where the temperature is lowered beneath the solidification temperature of polypropylene during the relaxation step will be done. Preliminary results for these tests are promising.
Numerical simulation of tensile fracture for hmwpe yarns using virtual fibers
(Wydawnictwo Politechniki Łódzkiej, 2022) Wang, Yu; Xie, Junbo; Arnold, Gilles; Tourlonias, Michel; Jiao, Yanan; Wang, Peng
As yarns control the ultimate failure of fiber reinforced composites, mechanical behavior warrants much consideration. The present study focuses on the experimental and simulation analysis of the tensile fracture behavior of twisted yarns. A quasi-fiber scale model of twisted yarns made of HMWPE fibers is established using virtual fibers. The tensile fracture behavior of twisted yarns is simulated using a maximum stress criterion with a random distribution of properties. The tensile fracture loads of six kinds of twisted yarns agree well with the experimental results. The numerical precision and dispersion of the proposed method are analyzed systematically. The influence of damage factor and displacement at failures on the simulation results of twisted yarns are also obtained. Above modeling and analysis method provides a helpful tool for understanding the yarn architectures of fiber reinforced composites.