Geometrical and mechanical characterisation of hollow thermoplastic microspheres for syntactic foam applications

Curd, Matthew E.; Morrison, N. A.; Smith, Margaret S.; Gajjar, Parmesh; Yousaf, Zeshan; Parnell, William J.

doi:10.1016/j.compositesb.2021.108952

Cited by 19 publications

(19 citation statements)

References 51 publications

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“…By calculating the model's prediction of the stiffness of a SF containing HTMs with sizes and aspect ratios distributed identically to the imaging data, we are able to solve iteratively for the optimal fitting values of the unknown (or unverified) properties of the HTMs. In particular, we extend previous results on the characterization of the HTMs by computing values for their Young's moduli and Poisson's ratios, comparing these to analogous values found in [26] via fits to compression experiments [4], and we determine a representative value of the shell thickness of 551 DE 40 d42 grade HTMs, complementing the directly measured value of the average shell thickness of the 920 DE 80 d30 grade HTMs determined in [26]. Furthermore, the thermal degradation of these HTM SFs is studied by using thermogravimetric analysis (TGA).…”

Section: Introductionmentioning

confidence: 57%

“…Monotonic tensile tests are also carried out to study the elongation of the SFs at break. Furthermore, we consider the physical characterization of the HTMs in question, by using a model based on the Generalized Self-Consistent Method, combining geometrical polydispersity data obtained via imaging techniques [26] with the measured tensile response of HTM SFs. By calculating the model's prediction of the stiffness of a SF containing HTMs with sizes and aspect ratios distributed identically to the imaging data, we are able to solve iteratively for the optimal fitting values of the unknown (or unverified) properties of the HTMs.…”

Section: Introductionmentioning

confidence: 99%

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Tensile properties of all-polymeric syntactic foam composites: Experimental characterization and mathematical modelling

Yousaf

Morrison

Parnell

2022

Composites Part B: Engineering

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Section: Introductionmentioning

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Tensile properties of all-polymeric syntactic foam composites: Experimental characterization and mathematical modelling

Yousaf

Morrison

Parnell

2022

Composites Part B: Engineering

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“…By comparing our work with the traditional absorbers, such as the anechoic coatings (13,(44)(45)(46)(47) and penta-mode structures (19), we find that our design scheme is straightforward and more effective because only the longitudinal modes are involved, achieved by both the rod geometry separated by air gaps, and the subwavelength lateral dimension of each rod. In this manner, the lateral modes can only exist in the form of evanescent waves, which cannot couple to the incident wave (48).…”

Section: Discussionmentioning

confidence: 99%

Underwater metamaterial absorber with impedance-matched composite

Gao

Tinel

et al. 2022

Sci. Adv.

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By using a structured tungsten-polyurethane composite that is impedance matched to water while simultaneously having a much slower longitudinal sound speed, we have theoretically designed and experimentally realized an underwater acoustic absorber exhibiting high absorption from 4 to 20 kHz, measured in a 5.6 m by 3.6 m water pool with the time-domain approach. The broadband functionality is achieved by optimally engineering the distribution of the Fabry-Perot resonances, based on an integration scheme, to attain impedance matching over a broad frequency range. The average thickness of the integrated absorber, 8.9 mm, is in the deep subwavelength regime (~λ/42 at 4 kHz) and close to the causal minimum thickness of 8.2 mm that is evaluated from the simulated absorption spectrum. The structured composite represents a new type of acoustic metamaterials that has high acoustic energy density and promises broad underwater applications.

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“…Hollow particles of different material types, shapes and sizes have been successfully used to develop syntactic foams and are extensively documented in literature. [ 4,14–18 ] A new type of lightweight hollow filler is the expanded glass (EG) particles. These particles are made from post‐consumer recycled glass that serve as excellent light weight aggregates and fillers while helping reduce waste and improve sustainability.…”

Section: Introductionmentioning

confidence: 99%

Effect of expanded glass particle size on compressive properties of vinyl ester syntactic foams

et al. 2022

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The most common fillers for syntactic foam development are glass microballoons or fly ash cenospheres. However, the need for improved properties and reduced cost requires exploring other possibilities. In this work, syntactic foams of vinyl ester resin reinforced with expanded glass particles (EG) were fabricated and compressive properties of the composites were studied. The foam EGS was reinforced with smaller particles of size 0.04–0.125 mm in 15, 30, and 45 vol.% and EGL had larger particles of size 0.25–0.5 mm in 15 and 30 vol.%. Compression testing reveals that 45 vol.% smaller particles enhance the modulus of the EGS foam by up to 48% with a 3.4% reduction in yield strength compared to neat resin. Strain rate sensitivity was observed in both the modulus and yield strength values for all composites. Composite EGS with 15 and 30 vol.% filler showed better strength and modulus than the neat resin at 0.01 s−1 strain rate, which is an overall improvement in the material. When compared with the literature data, the foams made in the present work have the highest compressive strength and modulus for the same density.

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Geometrical and mechanical characterisation of hollow thermoplastic microspheres for syntactic foam applications

Cited by 19 publications

References 51 publications

Tensile properties of all-polymeric syntactic foam composites: Experimental characterization and mathematical modelling

Tensile properties of all-polymeric syntactic foam composites: Experimental characterization and mathematical modelling

Underwater metamaterial absorber with impedance-matched composite

Effect of expanded glass particle size on compressive properties of vinyl ester syntactic foams

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