端部增强方式对CFRP管轴压力学性能的影响
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摘要
端部局部破坏严重制约CFRP(Carbon Fiber Reinforced Polymer)管轴压承载力的发挥,对采用金属加强箍-金属端帽增强与碳纤维-金属内衬增强两种端部增强方式的CFRP层合管进行了轴压试验,得到了试件受力过程和破坏形式。基于Hashin失效准则,利用有限元模型分析两种端部增强方式下CFRP管首层失效模式和承载力,并解释了增强机理。研究表明:与未施加端部增强的试件相比,端部增强可改变试件失效模式并提高承载力;端部增强时,外部增强约束刚度不宜过大,增强件与试件较大的刚度差会导致变形不一致,易在增强端边缘处发生剪切破坏;采用碳纤维-金属内衬的端部增强方式可有效防止端部发生"开花式"破坏和剪切破坏,可使层合管发生整体破坏,轴压承载力提高了46.37%。
The CFRP( carbon fiber reinforced polymer) tube is used to control the axial load bearing capacity of the CFRP( carbon fiber reinforced polymer) pipe,and the CFRP laminates are reinforced with the metal reinforcing hoop-metal end cap and the carbon fiber-metal lining reinforcement. The stress test and the failure form of the specimen are obtained by axial compression test. Based on the Hashin failure criterion,the finite element model was used to analyze the failure mode and bearing capacity of the CFRP pipe under the two end enhancement modes,and the enhancement mechanism was explained. The results show that the end enhancement can change the failure mode of the specimen and increase the bearing capacity compared with the specimen with no end reinforcement. When the end is strengthened,the external reinforcement stiffness should not be too large,and the reinforcement and the specimen are larger. The difference in stiffness will lead to inconsistent deformation,easy to occur at the edge of the enhanced edge of the shear damage. The use of carbon fiber-metal as the enhanced way of the end can effectively prevent the end of the " flowering" damage and shear damage. The overall bearing damage and axial load capacity increased by 46. 37%.
The CFRP( carbon fiber reinforced polymer) tube is used to control the axial load bearing capacity of the CFRP( carbon fiber reinforced polymer) pipe,and the CFRP laminates are reinforced with the metal reinforcing hoop-metal end cap and the carbon fiber-metal lining reinforcement. The stress test and the failure form of the specimen are obtained by axial compression test. Based on the Hashin failure criterion,the finite element model was used to analyze the failure mode and bearing capacity of the CFRP pipe under the two end enhancement modes,and the enhancement mechanism was explained. The results show that the end enhancement can change the failure mode of the specimen and increase the bearing capacity compared with the specimen with no end reinforcement. When the end is strengthened,the external reinforcement stiffness should not be too large,and the reinforcement and the specimen are larger. The difference in stiffness will lead to inconsistent deformation,easy to occur at the edge of the enhanced edge of the shear damage. The use of carbon fiber-metal as the enhanced way of the end can effectively prevent the end of the " flowering" damage and shear damage. The overall bearing damage and axial load capacity increased by 46. 37%.
引文
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[15]刘勇,陈世健,高鑫,等.基于Hashin准则的单层板渐进失效分析[J].装备环境工程,2010,7(1):34-39.
[2]刘书田,陈秀华,曹先凡,等.夹芯圆柱壳稳定性优化[J].工程力学,2005,22(01):135-140.
[3]陈立.纤维增强树脂基复合材料组合轴心压杆的强度与稳定性研究[D].南京:中国人民解放军理工大学,2012.
[4]林松,王俊锋,张建宝,等.大载荷缠绕杆件的拉伸和压缩性能[J].宇航材料工艺,2012,42(3):86-90.
[5]周继凯,杜钦庆,袁明亮,等.GFRP筋抗压力学性能试验研究[J].河海大学学报,2008,36(4):542-545.
[6]薛晓敏,孙清,王虎长,等.玻璃纤维增强环氧树脂基复合材料受压管件稳定性试验及理论研究[J].工程力学,2013,30(9):251-258.
[7]郑志才,孙士祥,陈艳,等.碳纤维复合材料薄壁管的制备及其轴向压缩性能研究[J].工程塑料应用,2008,36(4):44-47.
[8]田春雷,皮爱国,黄风雷.CFRP复合材料层合圆筒轴向压缩试验与数值模拟[J].复合材料学报,2013,30(2):159-164.
[9]Pfeil M S,Teixeira A M A J,Battista R C.Experimental tests on GFRP truss modules for dismountable bridges[J].Composite Structures,2009,89(1):70-76.
[10]杜刚,曾竟成,肖加余,等.复合材料圆管端部加强对其轴压性能影响的实验分析[J].材料科学与工程学报,2007,25(3):457-459.
[11]彭超义.空间运载器推力支架用复合材料管件轴压性能研究[D].长沙:国防科学技术大学,2006.
[12]钟卫洲,张青平,黄西成,等.碳纤维复合材料结构抗压性能实验研究[C]//全国爆炸力学实验技术学术会议.2006.
[13]Hashin Z.Failure criteria for unidirectional fiber composites[J].Journal of Applied Mechanics,1980,47(12):329-334.
[14]李梦佳.复合材料T型接头界面增强设计方法研究[D].南京:南京航空航天大学,2015.
[15]刘勇,陈世健,高鑫,等.基于Hashin准则的单层板渐进失效分析[J].装备环境工程,2010,7(1):34-39.