铝蜂窝填充CFRP结构的弯曲性能研究

EXPERIMENTAL AND NUMERICAL INVESTIGATION OF THE BENDING CHARACTERISTICS OF CFRP SQUARE TUBE FILLED WITH ALUMINUM HONEYCOMB

CFRP相对于金属材料更加轻质高强,并且具有良好的抗冲击性能和成型工艺性能,已成为未来汽车轻量化的重要材料。采用三点弯曲实验和有限元仿真相结合的方法,对铝蜂窝填充CFRP结构的侧向力学性能和破坏机理开展了研究。实验结果表明,相对CFRP空管,铝蜂窝填充管件的平均峰值载荷、吸收能量和比吸能率分别提高17.09%、32.31%和0.9%,并且破坏过程也更加稳定。此外,采用了Ls-dyna软件对其受力进行了有限元仿真,获得了与物理实验相吻合的破坏模式和力-位移曲线。研究表明,利用轻质铝蜂窝结构填充CFRP管件,能有效改善CFRP结构的侧向弯曲性能,对指导轻量化汽车结构的设计具有重要意义。

Carbon fiber reinforced plastic（ CFRP） has become the very important material for the lightweighting automotive in the future because of its lighter weight, higher strength and better performance compared with metallic materials. Combining the three-point bending experiment and finite element simulation method,the performance and failure mechanisms of CFRP tube filled aluminum honeycomb are carried out. The test results show that the peak load,absorbed energy and specific energy absorption（ SEA） of the filled CFRP tube are increased by 17. 09%,32. 31% and 0. 9%,respectively,compared with the bare CFRP tube,and the failure mode is more stable. In addition,by the finite element simulation using Ls-dyna software,the failure mode and load-displacement curve agreed well with the physical experiments. It indicates that CFRP tube filled with lightweight aluminum honeycomb structure can effectively improve the lateral bending properties of bare CFRP structure,which is useful for the design of lightweight vehicle structure.