Influence of Wet and Thermal Environment on Low Speed Collision Damage of Carbon Fiber Composite Anti-collision Beams
CHEN Li1, ZHU Sunke1,*, DONG Shaojiang1, XIAO Yong1, SONG Xia2
1 School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 School of Mechatronics and Vehicle Engineering, Wuhan Huaxia University of Technology, Wuhan 430223, China
Abstract: In order to study the influence of humid and thermal environment on the mechanical properties of carbon fiber reinforced composite(CFRP) anti-collision beams, a failure prediction model of carbon fiber composite considering the humid and thermal effect was established to predict the properties of 23 ℃ dry state (RTD) materials under humid and thermal environment, and the material properties under 70 ℃ dry state (ETD) and 70 ℃ equilibrium moisture absorption (ETW) were predicted respectively. By using solid elements to simulate the mechanical properties of composite materials, builted a finite element explicit dynamic model of CFRP anti-collision beams at low speed. Developed a VUSDFLD subroutine considering Hashin failure criterion to determine the damage degree of CFRP anti-collision beams in 7 directions under low speed collision. On this basis, conbined the failure prediction model with VUSDFLD subroutine to run a tensile simulation to the carbon fiber composite under the same experimental conditions. The simulation results agreed well with the experimental results, and the validity of the model was verified. A Python automatic post-processing program based on ABAQUS interface was developed to calculate the number of damage elements in each layer and direction of CFRP anti-collision beams. The calculated results showed that, compared with under 23 ℃ dry condition, the damage rates of CFRP anti-collision beam units under 70 ℃ dry condition and 70 ℃ equilibrium hygroscopic condition increased by 22% and 49.6%, and the displacement of the two ends of the CFRP anti-collision beam increased by 1.33 mm and 4.51 mm respectively. This study provides a new method and idea for evaluating the influence of wet and thermal environment on the low-speed collision damage of carbon fiber composite anti-collision beams.
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2024, Vol. 38 
