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Evaluating the interfacial properties of wrinkled graphene fiber through single-fiber fragmentation tests
摘要： Graphene ?ber has attracted much attention due to its potential applications in supercapacitors, dye-sensitized solar cells, actuators, motors, stretchable circuits and functional composites, owing to its high electrical conductivity, tensile strength and good ?exibility. The high tensile strength of graphene ?ber renders it promising candidate as the reinforcement in the composites. The interface is the key element for the ?ber-reinforced composites; however, there is no study about the interfacial evaluation about the graphene ?ber reinforcement composites. Herein, in this study, we fabricate the high-strength graphene ?bers (up to 890.1 MPa) through the wet spinning and thermal annealing method, make the graphene ?ber-reinforced single-?ber composite, and develop a novel and facile fragmentation test to quantitatively evaluate the interfacial performance of graphene ?ber. Graphene ?ber has the interfacial shear stress (IFSS) of 60.6 MPa, exhibiting one of the highest IFSS among the carbon nanotube yarns and commercial carbon ?bers composites. The superior interfacial performance of graphene ?ber is attributed to the surface wrinkles and grooves, which establishes strong physical interlocking between graphene ?ber and resin, favoring for the stress transfer. This work will pave the way for the development of graphene ?ber-reinforced composites.
关键词： Wet spinning,Thermal annealing,Graphene ?ber,Composites,Interfacial properties,Fragmentation test
更新于2025-09-19 17:13:59
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Analysis of Second-Harmonic Generation of Low-Frequency Dilatational Lamb Waves in a Two-Layered Composite Plate
摘要： We analyze the effect of second-harmonic generation (SHG) of primary Lamb wave propagation in a two-layered composite plate, and then investigate the influence of interfacial properties on the said effect at low frequency. It is found that changes in the interfacial properties essentially affect the dispersion relation and then the maximum cumulative distance of the double-frequency Lamb wave generated. This will remarkably influence the efficiency of SHG. To overcome the complications arising from the inherent dispersion and multimode natures in analyzing the SHG effect of Lamb waves, the present work focuses on the analysis of the SHG effect of low-frequency dilatational Lamb wave propagation. Both the numerical analysis and finite element simulation indicate that the SHG effect of low-frequency dilatational Lamb wave propagation is found to be much more sensitive to changes in the interfacial properties than primary Lamb waves. The potential of using the SHG effect of low-frequency dilatational Lamb waves to characterize a minor change in the interfacial properties is analyzed.
关键词： composite plate,interfacial properties,low frequency,second-harmonic generation,Lamb waves
更新于2025-09-09 09:28:46