典型螺栓连接CFRP薄壁C型柱轴压失效行为:试验及数值模拟  

Axial compression failure behavior of typical bolted CFRP thin-walled C-channels: Experimental and numerical simulation

作　　者：解江 宋山山 牟浩蕾 刘冰 冯振宇 XIE Jiang;SONG Shanshan;MOU Haolei;LIU Bing;FENG Zhenyu(College of Safety Science and Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学安全科学与工程学院,天津300300

出　　处：《复合材料学报》2021年第10期3361-3372,共12页Acta Materiae Compositae Sinica

基　　金：天津市教委科研计划项目(2019KJ135)。

摘　　要：为了研究典型螺栓连接碳纤维增强树脂复合材料(CFRP)薄壁C型柱的轴压失效模式及吸能特性,进行了5组不同铺层方式C型柱的准静态轴压试验,即[0/90]_(4s)、[±45]_(4s)、[±45/90_(2)/0_(4)]_(s)、[±45/90/0_(2)/90/0_(2)]_(s)、[90/±45/0]_(2s),获得其失效形貌及载荷-位移曲线。采用Lavadèze单层壳单元模型、Puck-Yamada失效准则、层间胶粘单元及螺栓模型,建立C型柱层合壳模型进行轴压仿真,并与试验失效形貌、载荷-位移曲线及吸能特性评估指标进行对比分析。结果表明:0°、±45°、90°纤维可以显著影响C型柱轴压失效模式及吸能特性。在轴压载荷下,±45°纤维铺设C型柱发生局部屈曲失效模式,吸能特性差。±45°纤维铺设在外部,0°和90°纤维交替铺设在内部的C型柱,其轴压失效过程平稳,吸能特性好。与C型柱轴压试验结果相比,层合壳模型获得的整体变形和局部失效形貌吻合较好,载荷-位移曲线变化趋势和吸能特性评价指标基本一致。研究结果对CFRP薄壁C型柱吸能设计具有一定的指导意义。Aiming at studying the axial compressive failure mode and energy-absorbing characteristics of typical bolted carbon fiber reinforced polymer(CFRP) thin-walled C-channels, the quasi-static axial compression tests of five groups of C-channels with different layups, i.e. [0/90]_(4s), [±45]_(4s), [±45/90_(2)/0_(4)]_(s), [±45/90/0_(2)/90/0_(2)]_(s) and[90/±45/0]_(2s), were conducted. The failure morphology and load-displacement curves were obtained. Considering the Lavadèze single-layer shell element model, Puck-Yamada failure criterion, interlayer cohesive element and bolt connection model, the stacked shell models of C-channels were established to perform the axial compression simulation, and the failure morphology, force-displacement curve and energy-absorbing metrics were compared with the test and analyzed. The results show that the 0°, ±45° and 90° fibers can significantly affect the axial compression failure mode and energy-absorbing characteristics of C-channels. Under the axial compression loading, the local buckling failure mode occurs for the C-channels with ± 45 ° fiber, resulting in poor energy-absorbing characteristics.For the C-channels with outside ± 45° fiber, and the inside 0° and 90° fiber, the axial compression failure process is stable, resulting in good energy-absorbing characteristics. The overall deformation and local failure morphology obtained by stacked shell models are in good agreement with the test results, the force-displacement curves and the energy-absorbing metrics are basically consistent with the test results. The research results can provide guidance for energy-absorbing design of CFRP thin-walled C-channels.

关 键 词：CFRP薄壁C型柱 铺层方式 失效模式 吸能特性 层合壳模型 

分 类 号：V214.8[航空宇航科学与技术—航空宇航推进理论与工程] TQ327.3[化学工程—合成树脂塑料工业]