Dynamic Compressive Properties of Graphene/Ceramic Particle Reinforced Polyurethane-Based Composites

doi:10.12382/bgxb.2021.0777

Abstract

Abstract:

The good mechanical properties of polyurethane make it widely used in various fields. By introducing graphene reinforcement into the polyurethane matrix, it can greatly enhance the properties of the polyurethane-based composites. To obtain the polyurethane-based composites with high impact resistance, graphene oxide reinforced polyurethane was prepared by in-situ polymerization, and dynamic compression tests at different strain rates were carried out with the Hopkinson bar device. On this basis, 3.3 mm diameter Al₂O₃ granular ceramics was added as a new reinforcing phase by the pressureless infiltration method. The dynamic confining pressure experiment of graphene / granular ceramic reinforced polyurethane-based composites is performed, and the stress-strain curve of the sample is obtained. The finite element simulation model of the composite is established by using LS-DYNA. Combined with the experimental data, the reliability of the simulation is verified, the deformation process and damage mechanism of the composite under dynamic confining pressure are analyzed, the simulation analysis of the samples with different particle sizes under dynamic confining pressure is carried out, and the influence of ceramic particles with different particle sizes on the dynamic compression mechanical properties of the composite is discussed. The results show that: the particle size of ceramic particles is closely related to the compressive strength of the composites; with the decrease of ceramic particle size, i.e., the number of ceramic particles increases and the particle gap decreases, the compressive properties of the composite are improved.

Key words: composite, polyurethane, particle reinforcement, dynamic performance, numerical simulation

ZOU Guangping, WU Songyang, XU Shubo, CHANG Zhongliang, WANG Xuan. Dynamic Compressive Properties of Graphene/Ceramic Particle Reinforced Polyurethane-Based Composites[J]. Acta Armamentarii, 2023, 44(3): 728-735.

Figures/Tables 16

Fig. 1 Graphene oxide dispersion solution (left) and static compression test sample (right)

Fig. 2 Static compressive stress-strain curves

Fig. 3 Annular dynamic pressure test sample of graphene reinforced polyurethane

Fig. 4 Dynamic compressive stress-strain curves

Fig. 5 Graphene / granular ceramic reinforced polyurethane-based composite

Fig. 6 Schematic diagram of SHPB confining pressure device

Fig. 7 Sample damage

Fig. 8 Stress-strain curve under dynamic confining pressure

Table 1 Model parameters of Al2O3 ceramic

ρ/(g•cm^-3)	G/GPa	A	B	M	N	D₁	D₂
3.86	118	0.95	0.28	0.6	0.64	0.1	0.7

Fig. 9 Finite element model for numerical calculation

Fig. 10 Strain rate-time curves

Fig. 11 Stress-strain curves

Fig. 12 Damage history of the composite

Fig. 13 Different ceramic particle size models

Fig. 14 Stress-strain curves of the composites with different particle sizes

Table 2 Damage process of composites with different ceramic particle sizes

陶瓷粒径/mm	160 μs	200 μs	240 μs	280 μs	320 μs	360 μs
2.0
4.8

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