Hierarchical network structural composites for extraordinary energy dissipation inspired by the cat paw

Lu, Wenjiang; Zhang, Qicheng; Qin, Faxiang; Xu, Peng; Chen, Qian; Wang, Huan; Scarpa, Fabrizio; Peng, Hua-Xin

doi:10.1016/j.apmt.2021.101222

Cited by 15 publications

(14 citation statements)

References 47 publications

(44 reference statements)

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“…As shown in Figure d, the peak force attenuation rates of PU foam and CS@PU are 21% and 71%, respectively. It should be mentioned that the peak force attenuation rate η of SCS@PU reaches 81%, which is much higher than those of STG/PU (63%), polyborosiloxane/melamine sponge (45%), and polyborosiloxane/PU (37%) . This is due to the combination of porous PU foam and STG with a shear-thickening effect.…”

Section: Resultsmentioning

confidence: 89%

“…This is due to the combination of porous PU foam and STG with a shear-thickening effect. The introduction of CNT/STG and SiO 2 /STG enhances the cell walls of PU, accordingly increasing the energy loss coefficient of SCS@PU . The addition of CNT/STG and SiO 2 /STG also reduces the pore size of the foam and decelerates the expulsion of the air in the pores when the sample faces impact.…”

Section: Resultsmentioning

confidence: 99%

“…It should be mentioned that the peak force attenuation rate η of SCS@PU reaches 81%, which is much higher than those of STG/PU (63%), 12 polyborosiloxane/ melamine sponge (45%), 13 and polyborosiloxane/PU (37%). 42 This is due to the combination of porous PU foam and STG with a shear-thickening effect. The introduction of CNT/STG and SiO 2 /STG enhances the cell walls of PU, accordingly increasing the energy loss coefficient of SCS@PU.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The introduction of CNT/STG and SiO 2 /STG enhances the cell walls of PU, accordingly increasing the energy loss coefficient of SCS@PU. 42 The addition of CNT/ STG and SiO 2 /STG also reduces the pore size of the foam and decelerates the expulsion of the air in the pores when the sample faces impact. The air is expelled out and absorbed back into the foam slowly, which dissipates energy by a viscous flow.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…These results confirm that the SCS@PU developed offers multifunctional performances. To the best of our knowledge, as shown in Table S2, 12,13,16,17,42,44,45,48 a soft body armor with simultaneous strain-sensing ability and superhydrophobicity has never been reported.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 4 more Smart Citations

Multifunctional Polyurethane Composite Foam with Outstanding Anti-impact Capacity for Soft Body Armors

Fan

Xue

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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Herein, a multifunctional polyurethane (PU) composite foam with a hierarchical structure is fabricated by dip-coating a carbon nanotube/shear-thickening gel (CNT/STG) and spray-coating nano-SiO 2 /STG on PU foam. The prepared nano-SiO 2 / CNT/STG@PU (SCS@PU) composite foam is lightweight, highly compressive, electrically conductive, superhydrophobic, and impact-energy absorptive. As a result, it possesses an excellent sensing ability to compression with a stable response up to 80% strain, an outstanding linearity of R 2 > 0.99, and a wide response frequency of 0.01 to 1 Hz; it can also be used for effectively detecting impact force and sensing various human motions. Moreover, the superhydrophobicity with a water contact angle up to 154°of SCS@PU composite foam endows it with an excellent resistance to hazardous liquids (strong acid and alkali) to ensure its service reliability under harsh circumstances. In particular, the SCS@PU exhibits an outstanding anti-impact capability with an impact force attenuation rate of SCS@PU as high as 81%. Finally, its applications as soft body armors are demonstrated in protecting a wearer wearing a helmet with the SCS@PU as liner and using the SCS@PU as a smart kneecap against impact. On consideration of its excellent strain-sensing ability, superhydrophobicity, and outstanding anti-impact capability, the multifunctional SCS@PU composite foam developed is promising for personal safety protection.

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Multifunctional Polyurethane Composite Foam with Outstanding Anti-impact Capacity for Soft Body Armors

Fan

Xue

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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Bioinspired Structural Composite Flexible Material with High Cushion Performance

Zhuang,

Qian,

Wang

et al. 2023

Advanced Science

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Impacts occur everywhere, and they pose a serious threat to human health and production safety. Flexible materials with efficient cushioning and energy absorption are ideal candidates to provide protection from impacts. Despite the high demand, the cushioning capacity of protective materials is still limited. In this study, an integrated bionic strategy is proposed, and a bioinspired structural composite material with highly cushioning performance is developed on the basis of this strategy. The results demonstrated that the integrated bionic material, an S‐spider web‐foam, has excellent energy storage and dissipation as well as cushioning performance. Under impact loading, S‐spider web‐foam can reduce peak impact forces by a factor of 3.5 times better than silicone foam, achieving unprecedented cushioning performance. The results of this study deepen the understanding of flexible cushioning materials and may provide new strategies and inspiration for the preparation of high‐performance flexible cushioning materials.

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Elevated‐temperature mechanical performance of GFRP composite with functionalized hybrid nanofiller

Nuli

Fulmali

et al. 2022

J of Applied Polymer Sci

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In this article, alteration in the mechanical performance of glass fiber/epoxy (GE) composite due to individual and simultaneous incorporation of multi‐walled carbon nanotubes (CNT) and multi‐layered graphene sheets (MLG) in both their pristine and oxidized forms are discussed. Further, the effect of two different nanofiller concentrations (0.1 and 0.3 wt%) were also studied to optimize the performance. Flexural testing of these composites was performed at room temperature (RT), 70 and 110°C in‐situ temperatures to understand their temperature dependence behavior. From all considered composites, GE composite with 0.1 wt% of oxidized CNT and MLG mixture (O‐(CNT‐MLG)) (1:1) showed best flexural performance at all the in‐situ temperatures. The presence of oxidized CNTs and MLGs in the GE composite provided a synergetic strengthening effect like CNT pull‐outs and crack bridging confirmed through SEM imaging. Besides, oxidation helped in the dispersion of CNT and MLG in the composite. Glass transition temperature (Tg) of all the considered composites was evaluated using Differential Scanning Calorimetry (DSC). Fourier Transformed Infra‐red Spectroscopy (FTIR) was also conducted to confirm the functionalization of CNT and MLG after oxidation. During the fractography study, these composites showed variation in fiber/matrix interfacial bonding, matrix deformation, dispersion of nanofillers and fiber imprints, which helped to understand different failure modes responsible for the gross failure of the composites.

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Hierarchical network structural composites for extraordinary energy dissipation inspired by the cat paw

Cited by 15 publications

References 47 publications

Multifunctional Polyurethane Composite Foam with Outstanding Anti-impact Capacity for Soft Body Armors

Multifunctional Polyurethane Composite Foam with Outstanding Anti-impact Capacity for Soft Body Armors

Bioinspired Structural Composite Flexible Material with High Cushion Performance

Elevated‐temperature mechanical performance of GFRP composite with functionalized hybrid nanofiller

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