Mechanical response of sapphire transparent ceramic glass at different strain rates

NIU Huanhuan; YAN Xiaopeng; LUO Haoshun; CHEN Jiajun; LI Zhiqiang

doi:10.11883/bzycj-2021-0434

Volume 42 Issue 7

Jul. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(7): 073105

NIU Huanhuan, YAN Xiaopeng, LUO Haoshun, CHEN Jiajun, LI Zhiqiang. Mechanical response of sapphire transparent ceramic glass at different strain rates[J]. Explosion And Shock Waves, 2022, 42(7): 073105. doi: 10.11883/bzycj-2021-0434

Citation:

NIU Huanhuan, YAN Xiaopeng, LUO Haoshun, CHEN Jiajun, LI Zhiqiang. Mechanical response of sapphire transparent ceramic glass at different strain rates[J]. Explosion And Shock Waves, 2022, 42(7): 073105. doi: 10.11883/bzycj-2021-0434

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Mechanical response of sapphire transparent ceramic glass at different strain rates

doi: 10.11883/bzycj-2021-0434

NIU Huanhuan^1
,,
YAN Xiaopeng^{1, 2, 3},
LUO Haoshun¹,
CHEN Jiajun¹,
LI Zhiqiang^{1, 2, 3
,
,}

1.
Institute of Applied Mechanics, College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
2.
Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China
3.
National Demonstration Center for Experimental Mechanics Education, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received Date: 2021-10-18
Rev Recd Date: 2022-02-21

Available Online: 2022-03-29

Publish Date: 2022-07-25

Abstract

Abstract

Sapphire (Al₂O₃) transparent ceramic glass has excellent light transmittance and retains the excellent mechanical properties comparing with traditional ceramics. In order to understand the relationship between strength and strain rate of sapphire transparent ceramic glass and its failure process, the electronic tensile machine and split Hopkinson bar equipment were used to load the specimen at different strain rates (10⁻⁴, 10⁻³, 10⁻², 850, 1 100, 1 300, 1 450 s⁻¹). The quasi-static and dynamic compression failure processes of specimen were recorded by high-speed camera. The experimental results show sapphire transparent ceramic glass is a typical brittle material with strain rate effect. With the increase of strain rate, the compressive strength of the sapphire transparent ceramic glass will also increase. The failure cycle of sapphire is long under quasi-static compression, and the crack will expand along the path with the weakest bearing capacity. In addition, the strength curve of sapphire will decline briefly and then continue to rise, which is caused by the increase and propagation of the number of cracks. In the process of dynamic compression, the sapphire reaches the cracking strength in many places, forming more crack sources, and then the crack forms and expands to split the sapphire. When the sapphire transparent ceramic glass is subjected to compression, cracks will appear in the region with the weakest bearing capacity in the process of loading; soon after the cracks take shape and expand along the loading direction, the cracks interlace to reach a saturation state; and finally reach the compressive strength failure. Under dynamic compression, however, due to the loading rate is much higher than the propagation of the crack, several crack sources appear in the sapphirine transparent ceramic glass within a very short period of time, which requires more energy to make the crack forming and extending, exhibiting as the strain rate effect on its macro-scale performance.
- sapphire transparent ceramic glass,
- compressive strength,
- failure mode,
- failure process,
- strain rate effect

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References

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