Static/dynamic tensiletest of unidirectional reinforced GFRP composites

LIU Zishang; YANG Zhe; WEI Yanpeng; CAI Junshuang; ZHAO Shizhong; HUANG Chenguang

doi:10.11883/bzycj-2018-0193

Volume 39 Issue 9

Sep. 2019

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LIU Zishang, YANG Zhe, WEI Yanpeng, CAI Junshuang, ZHAO Shizhong, HUANG Chenguang. Static/dynamic tensiletest of unidirectional reinforced GFRP composites[J]. Explosion And Shock Waves, 2019, 39(9): 093101. doi: 10.11883/bzycj-2018-0193

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Static/dynamic tensiletest of unidirectional reinforced GFRP composites

doi: 10.11883/bzycj-2018-0193

1.
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
CRRC Qingdao Sifang CO., LTD, Qingdao 266111, Shandong, China

Received Date: 2018-06-01
Rev Recd Date: 2018-10-16

Available Online: 2019-08-25

Publish Date: 2019-09-01

Abstract

Abstract

In this paper, a series of static/dynamic tensile tests are performed for unidirectionally reinforced GFRP composites. Using the combination of high-speed photography and DIC (digital image correlation) technology, true stress-strain curves in different directions and strain rates are obtained. We also obtained the dynamic failure strain of the material in different directions, which are used to accurately describe the dynamic tensile and failure behavior of the material. The experimental results show that there is a stiffness change point N in the fiber reinforcement direction under different strain rate (10⁻³, 10, 10² s⁻¹) tensile conditions, and the modulus E_changed is 67.5%, 39% and 21.4% of the initial elastic modulus E_initial, respectively. The fiber has the highest strength in the 1 direction which is reinforced (608, 967 and 1 123 MPa, respectively) under different strain rates (10⁻³, 10 and 10² s⁻¹). The direction 2 has the lowest strength (75, 67 and 58 MPa, respectively). The strength of direction 3 is a little weak (90, 151 and 221 MPa, respectively). With the combination of high-speed photography and the DIC technology, the dynamic failure parameters of different directions under the strain rate of 100 s⁻¹ are obtained. The dynamic failure strain in 1−3 directions is 0.267, 0.078 and 0.099 respectively. The dynamic failure behavior of this unidirectional reinforced fiberglass composite can be more accurately described.
- dynamic failure strain,
- digital image correlation,
- strain rate effect,
- stiffness

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References

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