Investigation of bending modulus of fiber‐reinforced syntactic foams for sandwich and structural applications

Abstract

Polymer composite foams or syntactic foams containing 0.9, 1.76, 2.54, 3.54 and 4.5 vol% of E‐glass short fibers were processed and subjected to a three‐point bending test. The results show that the flexural modulus increased with fiber content, with the exception of 1.76% and 3.5% of fibers. This deviation was due to a higher void content for 1.76% and a non‐uniform distribution of fibers in the polymer composite foam system for 3.5%. However, in general, the incorporation of chopped strand fibers improved the flexural behavior of the syntactic foam system without much variation in density, thus making the reinforced syntactic foams act as improved core materials for sandwich and other structural applications. Copyright © 2007 John Wiley & Sons, Ltd.

Analysis of a functionally graded particulate composite under flexural loading conditions

“…Studies on three-point bend tests have been conducted in either flexural [14,23] or short beam shear test configurations [15][16][17]. In addition, fiber reinforced syntactic foams [24][25][26] and syntactic foam core sandwich composites have also been studied for bending properties [27]. Several studies on fracture toughness of syntactic foams have tested pre-cracked specimens under three-point bend conditions [28][29][30][31].…”

Preparation and properties of mesoporous silica/bismaleimide/diallylbisphenol composites with improved thermal stability, mechanical and dielectric properties

“…It is well known that the flexural strength of a material reflects the rigidity and toughness of the material, so those factors which are beneficial to improve the stiffness and/or the toughness can improve the flexural strength. Flexural modulus reflects the coinherent energy of a material, and the ability to resist strain, so a thermosetting resin with bigger molecular weight and a larger amount of rigid structure generally has higher modulus [29]. For a welldispersed particle/thermosetting resin composite, the crosslinking density is an important factor of determining the stiffness and toughness, and thus has significant influence on the flexural strength; in addition, the interfacial adhesion determines the stress transfer under an external loading, and thus provides additional contribution to the flexural properties.…”

“…The structure of MPSA is illustrated in Figure 1 and Figure 2. Solid-state 29 Si NMR of MPS (ppm): -50.5 (T 2 , (Table 1) were evaluated to see the effect of differing stoichiometry of MPSA on the processing and performance parameters, and also to establish the formulational latitude this system provides. Appropriate quantities of BDM and DBA were placed in a beaker with a mechanical stirrer and a thermometer.…”

“…Solid-state 29 Si NMR spectrum was recorded using TMS as an internal standard on a UNITY INOVA-400 (400 MHz NMR spectrometer, USA). Fourier Transform Infrared (FTIR) spectra were recorded between 400 and 4000 cm -1 with a resolution of 2 cm -1 on a Nicolet FTIR 5700 spectrometer (USA), and the sample powder was pressed into a pellet with KBr.…”

Flexural Behavior of Functionally Graded Sandwich Composite

“…An experimental investigation of failure of piecewise FG of sandwiches subjected to three point bending is carried out by Avila [27]. In addition, fiber reinforced syntactic foams [28][29][30] and syntactic foam core sandwich composites have also been studied for bending properties [31]. Specific properties of sandwich with complaint FG core needs attention as it is yet to be reported.…”