Abstract:This study investigates the tensile and damping behavior of Kevlar/glass/epoxy hybrid laminates. Hybrid Kevlar/glass with epoxy resin composites is fabricated considering different fiber volume fractions in combinations to show the influence of hybridization. Mechanical properties were inspected by an instrumented tensile test machine. A series of vibration tests were conducted to determine dynamic characteristics of the samples. Damping properties are calculated from logarithmic decrement method by using vibr… Show more
“…Investigations of AF composites showed approximately two to four times higher damping properties compared to GF composites at room temperature. 17,31 A similar damping behaviour has been observed for temperatures and frequencies at −20°C and 1 Hz (see Figure 10). Figure 10.Effect of the fibre material GF and AF on the fibre direction dependent damping behaviour of fibre reinforced EP and VE (DMTA, −20∘C at 1 Hz).…”
Section: Resultssupporting
confidence: 80%
“…The results are consistent with the literature 17,31 and may be explained by the anisotropic material behaviour of AF and its related enhanced damping properties in off-axis directions (see Section 'Static analysis'). Fig.…”
“…The VBT method is commonly used to analyse the damping properties of under-damped systems such as composite beams by analysing the free vibration decay of an oscillating structure at its first natural frequency f 1 . [58][59][60] Different excitation techniques with various suitability for the damping evaluation have previously been used, such as the excitation by shaker 61 , by impact hammer 17 or by initial displacement. [62][63][64] The activation of mainly the first mode may be well achieved by an initial displacement, as the focus is on the damping characteristics at the lowest natural frequency.…”
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“…Investigations of AF composites showed approximately two to four times higher damping properties compared to GF composites at room temperature. 17,31 A similar damping behaviour has been observed for temperatures and frequencies at −20°C and 1 Hz (see Figure 10). Figure 10.Effect of the fibre material GF and AF on the fibre direction dependent damping behaviour of fibre reinforced EP and VE (DMTA, −20∘C at 1 Hz).…”
Section: Resultssupporting
confidence: 80%
“…The results are consistent with the literature 17,31 and may be explained by the anisotropic material behaviour of AF and its related enhanced damping properties in off-axis directions (see Section 'Static analysis'). Fig.…”
“…The VBT method is commonly used to analyse the damping properties of under-damped systems such as composite beams by analysing the free vibration decay of an oscillating structure at its first natural frequency f 1 . [58][59][60] Different excitation techniques with various suitability for the damping evaluation have previously been used, such as the excitation by shaker 61 , by impact hammer 17 or by initial displacement. [62][63][64] The activation of mainly the first mode may be well achieved by an initial displacement, as the focus is on the damping characteristics at the lowest natural frequency.…”
Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.
“…FRP composite tubes and epoxy plates were modeled using Ansys 15, in which, 8-node brick elements solid 185 was used and three fine mesh was generated. Table 1 represents the input properties used for numerical Modeling, which are calculated from known fiber and epoxy nanocomposite properties obtained from the literature [12,47,48], via the modified rule of mixtures approach [equations (1)- (6)]. The analysis was performed by considering three different boundary conditions, namely fixed-fixed, cantilever and simply supported.…”
In recent times, basalt fiber reinforced polymer (BFRP) nanocomposites is being increasingly used in aerospace applications such as wing and fuselage structures of the aircraft and outer casings of the rocket, automobile engine drive shafts and fuel tanks in the oil and gas industries, which fills the gap between carbon and E-glass fiber reinforced polymer nanocomposites. These structures are subjected to vibrations and exposed to different temperatures in various places during their service life. However, the comparison of vibration response of silica particles reinforced basalt/epoxy and glass/ epoxy nanocomposite tubes in all three approaches, namely, experimental, analytical and numerical (Finite Element Modeling), have not found elsewhere. Analytical and numerical approaches minimize time, manpower and cost. Therefore, investigating the vibration response of different weight contents of these FRP nanocomposite tubes is novel and essential. Hence, in this study, the vibration response of silica nanoparticles reinforced epoxy, basalt/epoxy and E-glass/epoxy composites with different weight contents (0, 0.5, 1 and 1.5%) were investigated. The vibration tests were performed at three different boundary conditions such as cantilever, simply supported and fixed-fixed. The first three modes of vibration were considered for analysis. Besides, the heat deflection temperature and the hardness properties were also studied. The results indicate that the natural frequencies were higher for the fixed-fixed case and the damping parameters were higher for the simply supported case. Vibration properties, heat deflection temperature and hardness values were found to be higher in fiberreinforced nanocomposites than those of epoxy nanocomposites. The data presented in this study will be useful to generate the numerical models for the ground vibration test (GVT).
“…It has been noticed that using such fibers to reinforce the epoxy resin enhance the damping ratio of such materials. Extensive investigation to the effect of incorporating kavler fibers within the epoxy resin and hybrid composite materials on the dynamic properties of such materials have been studied by [15,16]. The dynamic behavior of E-glass Polyester composite of three laminate types with different fiber orientations has been studied by Al-Shukri et al [17].…”
This research offers an experimental and numerical study on the influence of multi-wall carbon nanotubes (MWCNTs) addition with different weight fractions on the dynamic characteristics of the unsaturated polyester (UP) reinforced by hybrid laminate composites. The laminate composites were prepared for only three layers as a total number of layers in such composites using Kevlar fibers and/or carbon fibers with different volume fractions. Both types of fibers were in the form of plain woven at (0°/90°) angle direction. Hand lay-up method was used to prepare the test samples. It was found that The best mechanical and dynamic properties based on the experimental study have been obtained for unsaturated polyester reinforced with (MWCNTs) particles at weight fraction (0.4% wt). Composite material made of unsaturated polyester reinforced with (MWCNTs) particles was also prepared with the same weight fraction of MWCNTs. Finite element method was used to model the free vibration of a cantilever beam made of composite material. ANSYS software composite Prep-Post (ACP) integrated within ANSYS Workbench software (18.2) was used to solve the FE problem. Field emission scanning electron microscopy (FESEM) and scanning electron microscopy (SEM) are applied to check the morphological properties of the composite material and the dispersion of MWCNT nanoparticles in the polymer matrix. Experimental and numerical Results obtained in the present work showed that the natural frequency and damping ratio of nano composite specimens increase with increasing weight fraction of MWCNTs. The results also showed that composite and hybrid composite materials with (0.4% wt) MWCNTs have higher values of natural frequency and damping ratio. It was found that the natural frequency for the hybrid nano composite with stacking sequence (UP+K/K/ K+MWCNT) increased by about 10.4% when adding MWCNTs compared with (UP+K/K/K) laminated composite while it becomes 13.82% and 5.8% for (UP+K/C/K+MWCNT) and (UP+C/K/C+MWCNT) hybrid nano composite material in comparison with that without MWCNTs. The increase percentages of the damping ratio of the such materials have been calculated and it was found to be, 12.23%, 15.9% and 8.6%, respectively. An agreement between the experimental and numerical results has been obtained from flexural and vibration tests with maximum errors not exceeded 3.4% and 9.34%, respectively.
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