Mechanical properties and fracture mechanisms of low-density fiber preforms reinforced phenolic aerogel composites

ZHANG Hongyu; QIAN Zhen; NIU Bo; ZHANG Yayun; LONG Donghui

doi:10.13801/j.cnki.fhclxb.20210909.002

Volume 39 Issue 8

Aug. 2022

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ZHANG Hongyu, QIAN Zhen, NIU Bo, et al. Mechanical properties and fracture mechanisms of low-density fiber preforms reinforced phenolic aerogel composites[J]. Acta Materiae Compositae Sinica, 2022, 39(8): 3663-3673. doi: 10.13801/j.cnki.fhclxb.20210909.002

Citation:

ZHANG Hongyu, QIAN Zhen, NIU Bo, et al. Mechanical properties and fracture mechanisms of low-density fiber preforms reinforced phenolic aerogel composites[J]. Acta Materiae Compositae Sinica, 2022, 39(8): 3663-3673. doi: 10.13801/j.cnki.fhclxb.20210909.002

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Mechanical properties and fracture mechanisms of low-density fiber preforms reinforced phenolic aerogel composites

doi: 10.13801/j.cnki.fhclxb.20210909.002

State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

Received Date: 2021-07-26
Accepted Date: 2021-08-20
Rev Recd Date: 2021-08-16

Available Online: 2021-09-09

Publish Date: 2022-08-31

Abstract

Abstract

Three kinds of needled fiber preforms reinforced phenolic aerogel composites (NF/PA) were prepared using lightweight needled preforms of glass fibers, carbon fibers and quartz fibers as reinforcements, respectively. The resultant fiber-dependent mechanical properties and fracture behavior were studied systematically. It is found that the NF/PA has a low density of ~0.45 g/cm³ and good insulation with room-temperature thermal conductivity as low as 0.046-0.067 W/(m·K). The phenolic aerogel has typical 3D porous structure with the overlapped and interconnected phenolic aerogel nanoparticles filling in fiber preforms, which has excellent interface structure with fiber. The NF/PA have obvious plastic deformation in the process of tension and compression. Furthermore, this work analyze the energy absorption of NF/PA during the crack propagate, and conclude that the type of fiber significantly affects the interface characteristics and thereby the fracture and failure mechanisms of composites. The interfacial bonding strength of carbon fiber is less than the ultimate shear stress of phenolic aerogel, and thereafter fibers are initially deboned with phenolic nanoparticles during the fracture process, responding to a “slip interface” feature. On the other hand, the bonding strengths of glass fiber and quartz fiber are both greater than the limit of shear stress of phenolic aerogel. Therefore, the phenolic aerogel is destroyed initially during the fracture process, which manifests as a “sticky interface” feature. Compared with glass fiber and quartz fiber, the carbon fiber shows more toughening and reinforcing effect on NF/PA.
- thermal protection material,
- needled fiber preforms,
- phenolic aerogel,
- mechanical properties,
- fracture mechanisms
Long Abstrsct
Innovation Points

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References(30)

References

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