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Evaluation the resistance of pre-deformed multi-layer 3D fabrics against knife penetration
(Wydawnictwo Politechniki Łódzkiej, 2022) Li, Mengru; Wang, Peng; Boussu, François; Soulat, Damien; Luo, Jie
The high-performance fibres are employed largely as reinforced polymer fabrics and composites in the flexible and stiff stab-resistant personal protection equipment. To simulate the knife attack on the human body, a new methodology named pre-deformed stabbing is developed to characterise the stab performance taking into account the fabric’s deformations. Three-dimensional warp interlock fabrics (3DWIFs) were manufactured using high-molecular-weight polyethylene (HMWPE) yarns. The forming was performed on the tested 3DWIFs before the stabbing. The stabbing results are influenced by the different mode deformations created during the forming. Based on the in-plane shearing map, three different stabbing locations were chosen. The effect of locations on the stab resistance of 3DWIFs was explored with the same impact energy level. The effect of stabbing localization on the deformed fabric is significant. The shear-locking angle in the location area is critical for the stab resistance of both [0°/90°]8 and [0°/90°, -45°/45°]4 deformed fabrics in the studied cases.
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.
Hyperelastic modelling and simulation for forming process of the braided fabrics
(Wydawnictwo Politechniki Łódzkiej, 2022) Li, Jinlei; Hamila, Nahiène; L'Hostis, Gildas; Maldonado, Eduardo Guzman; Wang, Peng
The composite reinforcements preforming including complex deformability behaviours. Numerical simulation analysis can effectively predict these behaviours and improve the preforming quality. Based on the related theory of continuum mechanics, this paper proposes a hyperelastic constitutive model to describe the nonlinear anisotropic mechanical behaviour of braided fabrics due to large deformation during the forming process. The tensile strain energy generated by the warp and weft stretching and the shear strain energy caused by the angle change between the warp and weft is considered in this model. The parameters of the hyperelastic constitutive law are identified by the bias-extension test. And it’s also used to simulate the forming process of the braided fabrics.
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.