Experimental and numerical studies of fatigue properties of carbon/glass fiber/epoxy hybrid composites enhanced with nano TiO2 powder

Abstract

The present work deals with the fatigue behavior of hybrid nanocomposites consisting epoxy strengthen by unidirectional carbon fibres, and/or woven roving glass fiber and TiO 2 nanofillers. For this purpose, nanocomposite material was manufactured by mixing TiO 2 nanoparticles with the epoxy using an ultrasonic mixer to insure complete dispersion of such particles in the base material. Different particle concentrations (1, 3, and 5) % wt. of TiO 2 nanoparticles have been added to the epoxy. Different types of hybrid nano composite materials were manufactured by adding three layers of carbon fibers and/or woven roving glass fiber to the prepared epoxy nanocomposite materials with a constant weight fraction of 30%. The laminated hybrid nanocomposite materials were then prepared using hand lay-up technique using a vacuum device. For experimental purposes tensile and fatigue test specimens have been manufactured according to ASTM-D3039 and ASTM D 3479/D 3479M-96, respectively, while ANSYS19 program was used to analyze the fatigue behavior of such materials numerically. Tensile tests were carried out at room temperature while fatigue tests has been carried out at constant stress ratio (R=-1). Scanning electron microscope (SEM) was used to identify the underlying mechanisms for fatigue failure and the progressive of damage growth. For each test, three specimens were tested and the average magnitude for each property was taken. The results obtained indicated that the hybrid nanocomposite (EP+C/C/C+3% TiO 2 ) has the highest fatigue limit and tensile strength in comparison with the other tested material, while the SEM results showed that the composite failed by a brittle way. It has been also generally observed that the addition of (TiO 2 ) nanoparticles has a positive effect on the fatigue behaviour of the such materials.

Nylon 6/palygorskite nanocomposites: The influence of clay surface modification and processing parameters on the clay dispersion, mechanical, thermal, and rheological properties

“…This, possibly due a better dispersion and good adhesion of silicate nanofibers in matrix promoted by the surface energy reduction of Pal and shear forces induced during the extrusion process. For Nylon 6/sil‐Pal nanomaterials processed at high shear stress and high speed revolutions (Figure 5D), the fatigue strength at 0 and 25,000 cycles presents the highest values (Table 1) and this can be attributed because the fatigue strength depends not only on the tension strength but also on the ductility of the material offering more resistance to crack propagation 30,31 …”

“…For Nylon 6/sil-Pal nanomaterials processed at high shear stress and high speed revolutions (Figure 5D), the fatigue strength at 0 and 25,000 cycles presents the highest values (Table 1) and this can be attributed because the fatigue strength depends not only on the tension strength but also on the ductility of the material offering more resistance to crack propagation. 30,31…”

Using Thermomechanical Properties to Reassess Particles’ Dispersion in Nanostructured Polymers: Size vs. Content

“…From the perspective of the influence on the mechanical properties of composites, Hunain et al [ 14 ], for example, demonstrated the beneficial effect of titanium dioxide on the dynamic mechanical properties of fiber-reinforced polymer composites. The increase in fatigue resistance could be attributed to the influence of the filler simultaneously on the matrix, making it tougher and more rigid over the interphase regions, ensuring a higher adhesion among the fibers and matrix.…”

Properties of polymer epoxy matrix enhanced with nanooxides of aluminium and silicon

“…При дальнейшем увеличении концентрации возникают вынужденные связи непосредственно между наночастицами (агломерация), которые значительно слабее, чем связи между полимером и частицами. Важно отметить, что число и сила дополнительных связей КОМПОЗИЦИОННЫЕ МАТЕРИАЛЫ, МНОГОФУНКЦИОНАЛЬНЫЕ ПОКРЫТИЯ ИЗ НАНОМАТЕРИАЛОВ полимер -наночастицы зависят от активности поверхности наночастиц [28,36,37] и меняются в зависимости от метода их синтеза. Наиболее быстро эффект упрочнения среди диоксида кремния создают частицы As, имеющие, как показал анализ ИК-спектров [28,38]…”