Al-CFRP复合管的径向压缩性能

Radial Compressive Properties of Al-CFRP Composite Tubes

采用准静态径向压缩实验和有限元仿真相结合的方法,对碳纤维增强复合材料(CFRP)缠绕薄壁铝管(Al-CFRP)复合管的径向压缩性能和破坏机理进行了研究。实验表明,Al-CFRP复合管具有更稳定的失效破坏模式,相比纯CFRP管,其峰值载荷、总吸能和比吸能分别提高了77.4%,223.5%和39.6%,且相较纯Al管和纯CFRP管总吸能之和仍提高了41.6%。进一步对Al-CFRP复合管的破坏过程进行了有限元仿真,仿真得到的载荷位移曲线和总吸能位移曲线与实验结果吻合较好,验证了仿真模型的可靠性。通过结合Al-CFRP复合管实验结果与Al-CFRP复合管应力、应变分析,发现由于外层CFRP的束缚作用抑制了内衬Al管管壁因弯折过大而断裂,同时由于内衬Al管的支撑作用使得外层CFRP管未发生严重的纤维断裂和分层现象,因此Al-CFRP复合管可以有效抵抗管壁变形,提高径向压缩下的稳定性和吸能性。

Using the method of combining quasi-static radial compression experiment with finite element simulation,the radial compression characteristics and failure mechanism of the carbon fiber reinforced plastic(CFRP)wound thin-walled aluminum tube(Al-CFRP)composite tube were investigated.Test results show that the peak load,total absorbed energy and specific energy absorp-tion of Al-CFRP composite tube are increased by 77.4%,223.5%and 39.6%respectively compared to the pure CFRP tube,and the total absorbed energy is also increased by 41.6%compared to the sum of the pure aluminum tube and pure CFRP tube,and the fail-ure mode become more stable.In addition,the failure process of Al-CFRP composite tube was simulated by finite element method,results show that load-displacement curve and energy absorption-displacement curve are in good accordance with experiment results so that the reliability of the simulation model is verified.Study result indicates that the fracture of aluminum tube wall was inhibited by CFRP binding and there were no serious fiber fracture and lamination occurred in the CFRP tube due to the supporting of the lin-ing Al tube by combining the experimental results with the stress and strain analysis of the Al-CFRP composite tube.Therefore,the Al-CFRP composite tube can effectively resist the wall deformation and improve the stability and energy absorption under radial compression.