Mechanical properties of brazed ultra-thin GH99 honeycomb sandwich structure

LIU Yazhou; SONG Xiaoguo; CHENG Weiwei; HU Shengpeng; CAO Jian

doi:10.12073/j.hjxb.20220706001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2022 > 43(11): 1-7. > DOI: 10.12073/j.hjxb.20220706001

LIU Yazhou, SONG Xiaoguo, CHENG Weiwei, HU Shengpeng, CAO Jian. Mechanical properties of brazed ultra-thin GH99 honeycomb sandwich structure[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2022, 43(11): 1-7. DOI: 10.12073/j.hjxb.20220706001

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Mechanical properties of brazed ultra-thin GH99 honeycomb sandwich structure

1.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001
2.
Beijing Institute of Aerospace Technology, China Aerospace Science and Industry Corporation Limited, Beijing, 100005

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Received Date: July 05, 2022
Available Online: October 12, 2022

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Abstract

Abstract

In this study, aiming at the fabrication of lightweight ultra-thin metal thermal protection structures, an ultra-thin sandwich structure was fabricated by vacuum brazing. The brazing interface of the sandwich structure and the microstructure of the base metal were characterized by optical microscope and scanning electron microscope. The interfacial peel strength and in-plane/out-plane compression properties of the sandwich structure were tested by a universal testing machine and compared with the finite element simulation results. The results showed that the grains of base metal transform from annealed twin structure to equiaxed structure before and after brazing. The brazing interface is mainly composed of the eutectic structure of Ni(s, s) and Ni₃Si, accompanied by a certain Cr(Mo, Ni) solid solution, Ni₂Si and NiSi₂ phases. The interfacial delamination failure occurred on the thin-walled panel. Both the in-plane and out-of-plane compression failures of the sandwich structure were buckling failures, and the simulation results were consistent with the experimental results.
- GH99,
- ultra-thin sandwich structure,
- mechanical behavior of brazing interface,
- structural failure mode

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References (20)

References

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Mechanical properties of brazed ultra-thin GH99 honeycomb sandwich structure