A “rolling ball method” to make glass fiber reinforced hollow epoxy macrospheres used for a three phase epoxy syntactic foam

Wu, Xinfeng; Wang, Y.; Yang, Xu; Yu, Jinhong; Wang, L. C.; Hou, Shibing; Jiang, Pingkai

doi:10.1039/c5ra07048a

Cited by 13 publications

(7 citation statements)

References 42 publications

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“…The macro-spheres were formed from spherical, low density EPS (Expanded Polystyrene) beads coated using rolling ball method [7,16] with layers of short-fibre reinforced composite, which is a combination of mineral fibre (i.e. wollastonite) and epoxy resin as shown in Fig.…”

Section: Specimen Manufacturingmentioning

confidence: 99%

“…The binder matrix can be made of polymeric binders and metals [13][14][15]. One-phase foam is formed by bonding engineered composite sphere matrix, which is made from EPS (Expanded Polystyrene) beads coated with epoxy resin matrix or fibre reinforced epoxy using "rolling ball method" [7,16]. The coated EPS beads can be cured and post-cured to shrink the EPS beads inside the spheres to produce hollow structures.…”

Section: Introductionmentioning

confidence: 99%

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Impact response and energy absorption of single phase syntactic foam

Pham

Chen

Kingston

et al. 2018

Composites Part B: Engineering

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This study experimentally investigates the static and impact response of a new single phase syntactic foam which has been newly developed for impact energy absorption. The syntactic foam had different densities ranging from 172 kg/m 3 to 366 kg/m 3 depending on the thickness and composition of the coating layers. The impact response and impact energy absorption were investigated by using instrumented drop-weight impact tests. Under static loads, the mechanical properties of the syntactic foam including the compressive strength, the yield stress, and Young's modulus increased with the density but the rate of increment decreased at higher densities. There were two types of progressive failures of the syntactic foam under impact loads. The failure propagation was examined and found to be dependent on the material density and the impact velocity. Interestingly, the densification only occurred in the low-density specimens while this phenomenon was not observed for the specimens with the density greater than 288 kg/m 3. The impact energy absorption capacity increased significantly with the density and the wall thickness of the macrospheres.

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Section: Specimen Manufacturingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact response and energy absorption of single phase syntactic foam

Pham

Chen

Kingston

et al. 2018

Composites Part B: Engineering

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“…It is mainly used to provide net buoyancy for various underwater operating systems, ensuring that its counterweight equipment can work stably and safely under water. , At the same time, it also has the advantages of low water absorption, good weather resistance, resistance to hydrostatic pressure, and large safety and reliability. It can be applied to the buoy system, marine mining system, deep sea carrying operation equipment, marine survey and monitoring system, offshore oil system, and so forth. − The syntactic foam buoyancy material forming process can be further subdivided into the casting method, the vacuum impregnation method, the liquid-transfer molding method, the particle deposition method, and the molding method . Among them, the compression molding method is ideal, and it is also the most commonly used molding method.…”

Section: Introductionmentioning

confidence: 99%

Development and Mechanical Characterization of HGMS–EHS-Reinforced Hollow Glass Bead Composites

et al. 2020

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Hollow glass microsphere-reinforced epoxy hollow spheres (HGMS–EHSs) were prepared by a “rolling ball method” using expanded polystyrene beads, HGMSs, and epoxy resin (EP). The three-phase epoxy syntactic foam (epoxy/HGMS–EHS–HGMS composite) was fabricated by combining HGMS–EHS as a lightweight filler with EP and HGMS by a “molding method”. The HGMS–EHS and epoxy curing agent systems were well mixed by scanning electron microscopy. Experiments show that higher HGMS–EHS stack volume fraction, lower HGMS–EHS layer number, higher HGMS–EHS diameter, lower HGMS–EHS density, higher HGMS volume fraction, and lower HGMS density result in a decrease in the density of the three-phase epoxy syntactic foam. However, the above factors have the opposite effect on the compressive strength of the three-phase epoxy syntactic foam. Therefore, in order to obtain the “high-strength and low-density” three-phase epoxy syntactic foam, the influence of various factors should be considered comprehensively to achieve the best balance of compressive strength and density of the three-phase epoxy syntactic foam. This can provide some advice for the preparation of buoyancy materials for deep sea operations.

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“…The “rolling ball” method is the most popular way to prepare HCSs with EPS beads [ 15 , 16 , 17 , 18 ]. Figure 2 outlines the manufacture procedures of the experiment.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Properties of C/C Hollow Spheres and the Energy Absorption Capacity of the Corresponding Aluminum Syntactic Foams

Zhao

Dong

et al. 2018

Materials

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The present study focuses on the preparation and characterization of lab-scale aluminum syntactic foams (ASFs) filled with hollow carbon spheres (HCSs). A new and original process for the fabrication of HCSs was explored. Firstly, expanded polystyrene beads with an average diameter of 6 mm and coated with carbon fibers/thermoset phenolic resin were produced by the “rolling ball” method. In the next step, the spheres were cured and post-cured, and then carbonized at 1050 °C under vacuum to form the HCSs. The porosity in the shell of the HCSs was decreased by increasing the number of impregnation–carbonization cycles. The aluminum syntactic foams were fabricated by casting the molten aluminum into a crucible filled with HCSs. The morphology of the hollow spheres before and after carbonization was investigated by scanning electron microscope (SEM). The compressive properties of the ASF were tested and the energy absorption capacities were calculated according to stress–strain curves. The results showed that the ASF filled with HCSs which had been treated by more cycles of impregnation–carbonization had higher energy absorption capacity. The aluminum syntactic foam absorbed 34.9 MJ/m3 (28.8 KJ/Kg) at 60% strain, which was much higher than traditional closed cell aluminum foams without particles. The HCSs have a promising future in producing a novel family of metal matrix syntactic foams.

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A “rolling ball method” to make glass fiber reinforced hollow epoxy macrospheres used for a three phase epoxy syntactic foam

Cited by 13 publications

References 42 publications

Impact response and energy absorption of single phase syntactic foam

Impact response and energy absorption of single phase syntactic foam

Development and Mechanical Characterization of HGMS–EHS-Reinforced Hollow Glass Bead Composites

Preparation and Properties of C/C Hollow Spheres and the Energy Absorption Capacity of the Corresponding Aluminum Syntactic Foams

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