The mechanical properties of epoxy resin composites modified by compound modification

Abstract

The composite modification is a method of modifying the surface of ultra high molecular weight polyethylene (UHMWPE) fabric through the surface grafting, at the same time the epoxy resin through ultrasonic and 3- amino propyl triethoxy silane (KH550), and then using the vacuum assisted resin transfer molding (VARTM) process to prepare the composite. Explore the improvement of the interface between fiber and resin so as to optimize the mechanical properties of the material. The modification effect, the mechanism of action and the effect of different KH550 contents on the properties of the composite were studied. Compared with the unmodified sample, When 1wt% KH550, the maximum tensile load, tensile strength and the tensile fracture length increased by 13.83%, 20.19% and 51.27%, respectively, and the tensile modulus was reduced by 29.74%. The maximum bending stress and bending modulus of the 1wt% KH550 sample were increased by 104.57% and 190.97%, respectively. The displacement, which is related to the maximum loading, the pressure and the tension area of the resin decreased by 7.81%. The KH550 content had a substantial influence on the thermal decomposition temperature of UHMWPE, and it had a small effect on the epoxy resin. A KH550 content of 1wt% strengthened the bonds between the fibre and the resin, such that the main failure mode of the pressure area was the hickies, and the tension areas contained hickies and cracks.

Quasi-Static Compression Response of Carbon Fiber Reinforced 2.5D Woven Composites at Different Loading Directions

“…The specimen was tested, and the raw data were processed to obtain the maximum load and compression strength of the specimen (shown in Table 2 , Table 3 and Table 4 ). The compressive load-displacement curve for the material is shown in Figure 4 The compression strength was calculated by the following formula [ 38 ]: where P was the maximum load of the compression test, N, and F was the cross-sectional area of the specimen, mm 2 .…”

Effect of Structural Differences on the Mechanical Properties of 3D Integrated Woven Spacer Sandwich Composites

“…The force on the upper surface layer quickly reached the maximum, and fracture occurred due to contact with the loading head. The top face sheet generally bears the compressive load and the bottom face sheet bears the tensile load, while pile failure occurs due to the shear load [ 16 , 22 , 23 ].…”

“…The schematic dia grams of the warp and weft direction samples are given in Figure 3a,b, respectively. The bending experiment was conducted according to the standard GB/T 1449-2005 (test method for bending performance of fiber-reinforced plastics) [16]. The experimen was carried out under the conditions of one atmosphere pressure and a constant temper ature of 25 °C.…”

“…The experiment was carried out on the INSTRON-8801 universal tester. The bending experiment was conducted according to the standard GB/T 1449-2005 (test method for bending performance of fiber-reinforced plastics) [16]. The experiment was carried out under the conditions of one atmosphere pressure and a constant temperature of 25 • C. The loading speed was 2 mm/min, and the span was set to 110 mm.…”

A Study on Temperature Distribution within HVDC Bushing Influenced by Accelerator Content during the Curing Process

“…During the curing process of the bushing capacitor core, the accelerator is an economical and easy means for speeding up the reaction process, which plays a vital role in the curing conditions and the performance of the cured products. So far, for accelerators, scholars have focused more on the gel time and the rheological properties of the reaction system [13][14][15], as well as the glass transition temperature, tensile modulus, elongation at break, elastic modulus, dielectric loss, and other properties of the cured products [16][17][18][19][20]. However, less research has been carried out to analyze the effect of the accelerator contents on the internal temperature distribution of large-size bushing with different length-to-diameter ratios during the curing process, which is important for the regulation of the curing conditions and the performance of the bushings.…”