湿热环境对碳纤维复合材料防撞梁低速碰撞损伤的影响

doi:10.11896/cldb.23090157

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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.

Key words： carbon fiber composite humid thermal environment explicit dynamics VUSDFLD subroutine Hashin failure criteria

Published: 10 December 2024 Online: 2024-12-10

CLC number:	TB33
	U465

Fund:Chongqing University Innovation Research Group (CXQT20019) and Science and Technology Research Program of Chongqing Municipal Education Commission (KJQN201900731).

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	CHEN Li
	ZHU Sunke
	DONG Shaojiang
	XIAO Yong
	SONG Xia

Cite this article:

CHEN Li,ZHU Sunke,DONG Shaojiang, et al. Influence of Wet and Thermal Environment on Low Speed Collision Damage of Carbon Fiber Composite Anti-collision Beams[J]. Materials Reports, 2024, 38(23): 23090157-7.

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http://www.mater-rep.com/EN/10.11896/cldb.23090157 OR http://www.mater-rep.com/EN/Y2024/V38/I23/23090157

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