Measurement and analysis of in-plane tensile non-uniform full-field strain of ceramic fiber reinforced SiO<sub>2</sub> aerogel composites

LV Shuangqi; SUN Yantao; TENG Xuefeng; YANG Xiaoguang; SHI Duoqi

doi:10.13801/j.cnki.fhclxb.20201029.001

Volume 38 Issue 7

Jul. 2021

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LV Shuangqi, SUN Yantao, TENG Xuefeng, et al. Measurement and analysis of in-plane tensile non-uniform full-field strain of ceramic fiber reinforced SiO2 aerogel composites[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2336-2347. doi: 10.13801/j.cnki.fhclxb.20201029.001

Citation:

LV Shuangqi, SUN Yantao, TENG Xuefeng, et al. Measurement and analysis of in-plane tensile non-uniform full-field strain of ceramic fiber reinforced SiO₂ aerogel composites[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2336-2347. doi: 10.13801/j.cnki.fhclxb.20201029.001

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Measurement and analysis of in-plane tensile non-uniform full-field strain of ceramic fiber reinforced SiO₂ aerogel composites

doi: 10.13801/j.cnki.fhclxb.20201029.001

1.
Aviation Engineering Institute, Civil Aviation Flight University of China, Guanghan 618307, China
2.
Beijing Aeronautical Engineering Technical Research Center, Beijing 100076, China
3.
School of Energy and Power Engineering, Beihang University, Beijing 100191, China

Received Date: 2020-08-31
Accepted Date: 2020-10-19

Available Online: 2020-10-29

Publish Date: 2021-07-15

Abstract

Abstract

By designing the circular arc edge griping scheme and dog bone type tensile specimen, the in-plane tensile property tests of ceramic fiber reinforced SiO₂ aerogel composites at room temperature were conducted. The full field deformation of ceramic fiber reinforced SiO₂ aerogel composites surface was measured and analyzed based on digital image correlation method. The non-uniform strain distribution results were obtained and discussed. The mechanical behavior characteristics and deformation and fracture mechanisms were further discussed. The results show that the in-plane tensile behavior of the ceramic fiber reinforced SiO₂ aerogel composites exhibits some nonlinear and ductile characteristics due to fiber reinforced and toughened mechanisms. Under certain load level, the strain distribution on the ceramic fiber reinforced SiO₂ aerogel composites surface shows significantly non-uniform. This is related to the internal random fiber arrangements and the different force transferring situations. In the mechanical tests, larger calculation areas can be selected for averaging treatment to reduce the non-uniform influence on the strain measurement. In the process of loading and fracture, the local strain concentration phenomenon exists on the ceramic fiber reinforced SiO₂ aerogel composites surface and evolves with the crack propagation. The fracture appearance under the in-plane tensile load has a serrated feature. It is mainly caused by the matrix fracture dominated by shear stress and the constraint effect of normal needling on the fiber layers. Results can point out the direction to improve the strengthening and toughening of thermal insulation composites.
- thermal protection system,
- aerogel composites,
- digital image correlation method,
- in-plane tensile,
- deformation and fracture
Long Abstrsct
Innovation Points

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References(22)

References

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