The effect of nylon nanofibers on the dynamic behaviour and the delamination resistance of GFRP composites

Abstract

Abstract. Vibrations are responsible for a considerable number of accidents in aircrafts, bridges and other civil engineering structures. Therefore, there is a need to reduce the vibrations on structures made of composite materials. Delamination is a particularly dangerous failure mode for composite materials because delaminated composites can lose up to 60% of their strength and stiffness and still remain unchanged. One of the methods to suppress vibrations and preventing delamination is to incorporate nanofibers into the composite laminates. The aim of the present work is to investigate how nylon nanofibers affect the dynamic behaviour and delamination resistance of glass fibre reinforced polymer (GFRP) composites. Experiments and numerical simulations using finite element modelling (FEM) analysis are used to estimate the natural frequencies, the damping ratio and inter-laminar strength in GFRP composites with and without nylon nanofibers. It is found that the natural frequencies of the nylon nano-modified composites do not change significantly as compared to the traditional composites. However, nano-modified composites demonstrated a considerable increase in damping ratio and inter-laminar shear strength due to the incorporation of nylon nanofibers. This work contributes to the knowledge about the mechanical and dynamic properties of glass fibre reinforced polymer (GFRP) composites with nylon nanofibers.

The Effect of Polycaprolactone Nanofibers on the Dynamic and Impact Behavior of Glass Fibre Reinforced Polymer Composites

“…For example, Ref. [23] reported that the natural frequencies of glass fiber composites showed minuscule changes (less than 4%) due to the inclusion of nylon nanofibers. Similar results were found in [24,25], which reported very small changes in the natural frequencies due to the inclusion of carbon nanofibers and nanotubes, respectively.…”

Effect of Sand Particle Size on Microstructure and Mechanical Properties of Gypsum-Cemented Similar Materials

“…This study is focused on the effect of sand particle size on the mechanical properties of similar gypsum cementation materials from the aspects of gypsum hydration reaction mechanism and physical characteristics of sand particle cementation. Meanwhile, the effect of sand particle size on the mechanical properties of similar materials cemented by gypsum is a complex issue, and there are many other influencing factors, including the typical particle size of the cementite [29], the environmental conditions [30,31], and the sand particle gradation [18,[32][33][34][35]. Furthermore, the specific values of the numerical experiments cannot correspond to the laboratory test results one by one, and only reveal the mechanical behavior of similar gypsum materials in the process of compression.…”

Investigating the Effect of Delamination Size, Stacking Sequences and Boundary Conditions on The Vibration Properties of Carbon Fiber Reinforced Polymer Composite

“…On the comparison of results for higher modes [7][8][9][10][11][12] , Mode 7 has the lowest percentage error as compared to mode 12 in 0/90/45/90 stacking sequences as shown in Table 2. On contrary to 0/90/45/90, 0/45 and 0/90 sequences showed an increase in percentage error on an increase in modes.…”

“…Delamination is the internal crack and can cause reduction in structural stiffness that leads to reduced natural frequency 10 . Vibration is the major influencing parameter towards the failure of aerospace, marine and civil structural components 11 . Therefor specific measures should be taken to overcome the effect of vibrations in composite structures.…”