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dynamic tensile and failure behavior of bi-directional reinforced GFRP materials

Acta Mechanica Sinica 2020年第2期36卷 460-471页

作者： Zishang Liu Zhe Yang Yuchao Chen Yangyang Yu Yanpeng Wei Maohui Li Chenguang Huang Institute of Mechanics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China CRRC Qingdao Sifang Co. LTDQingdao 266111China The Quartermaster Research Institute of Engineering and Technology Beijing 100010China

In this paper,a series of static/dynamic tensile tests are performed for glass fiber reinforced plastic(GFRP)composites.Using the combination of high-speed photography and digital image correlation(DIC)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 three directions under different strain rate(10-3 s-1,10 s-1,100 s-1)tensile conditions.The stiffness before and after N point is recorded as Einitial and Echanged respectively.The values of Echanged in weft direction and warp direction are about 30%to 50%of Einitial,while Echanged in tilt direction is only about 10%of Einitial.The fiber has the highest strength in the weft direction and the tilt direction has the lowest strength.With the combination of high-speed photography and DIC technology,the dynamic failure parameters of different directions under the strain rate of 100 s-1 are obtained.The dynamic failure strains in three directions are 0.245,0.373 and 0.341,respectively.The parameters are verified by impact three-point bending test.These works can more accurately describe the dynamic mechanical behavior of glass fiber reinforced plastic(GFRP)composites and provide reference for the design of GFRP structures.

关键词： Solid mechanics dynamic failure strain Digital image correlation strain rate effect Stiffness

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