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C型CFRP薄壁结构轴向吸能特性及其触发机制

吕睿 任毅如

吕睿, 任毅如. C型CFRP薄壁结构轴向吸能特性及其触发机制[J]. 复合材料学报, 2023, 40(10): 5948-5957. doi: 10.13801/j.cnki.fhclxb.20230112.003
引用本文: 吕睿, 任毅如. C型CFRP薄壁结构轴向吸能特性及其触发机制[J]. 复合材料学报, 2023, 40(10): 5948-5957. doi: 10.13801/j.cnki.fhclxb.20230112.003
LV Rui, REN Yiru. Axial energy absorption characteristics and trigger mechanism of C-channel CFRP thin-walled structures[J]. Acta Materiae Compositae Sinica, 2023, 40(10): 5948-5957. doi: 10.13801/j.cnki.fhclxb.20230112.003
Citation: LV Rui, REN Yiru. Axial energy absorption characteristics and trigger mechanism of C-channel CFRP thin-walled structures[J]. Acta Materiae Compositae Sinica, 2023, 40(10): 5948-5957. doi: 10.13801/j.cnki.fhclxb.20230112.003

C型CFRP薄壁结构轴向吸能特性及其触发机制

doi: 10.13801/j.cnki.fhclxb.20230112.003
基金项目: 国家自然科学基金 (52172356);湖南省自然科学基金(2022JJ10012)
详细信息
    通讯作者:

    任毅如,博士,教授,博士生导师,研究方向为先进结构设计 E-mail: renyiru@hnu.edu.cn

  • 中图分类号: TB332;V214.8

Axial energy absorption characteristics and trigger mechanism of C-channel CFRP thin-walled structures

Funds: National Natural Science Foundation of China (52172356); Hunan Provincial Natural Science Foundation of China (2022JJ10012)
  • 摘要: 为了提高C型碳纤维增强树脂复合材料(CFRP)薄壁结构的耐撞性,对其在轴向压溃载荷作用下的吸能特性和失效行为进行研究。考虑层间分层效应,建立了C型CFRP薄壁结构的渐进损伤模型。采用二次名义应力失效和基于混合模式能量方法的非线性损伤演化准则分别对层间初始失效和损伤演化进行预测。针对该结构提出混合角度倒角触发和尖顶触发,对比分析了不同触发配置对C型CFRP薄壁结构耐撞性指标和失效模式的影响。结果表明混合角度倒角触发所对应的初始峰值随着混合角度的增大呈减小的趋势。通过减小混合角度尖顶触发与加载板在初始压溃阶段的接触面积,能够有效降低初始峰值。混合角度尖顶触发能够改善失效过程,对提高该结构的耐撞性有积极的影响。

     

  • 图  1  C型碳纤维增强树脂复合材料(CFRP)薄壁结构有限元模型(FEM)

    Figure  1.  Finite element model (FEM) of C-channel carbon fiber reinforced polymer (CFRP) thin-walled structure

    图  2  C型CFRP薄壁结构最终失效形貌:(a) 仿真;(b) 试验[20]

    Figure  2.  Final failure morphologies of C-channel CFRP thin-walled structure: (a) Simulation; (b) Experiment[20]

    图  3  C型CFRP薄壁结构的试验[20]与仿真的载荷响应

    Figure  3.  Load response of experiment[20] and simulation of C-channel CFRP thin-walled structure

    图  4  不同混合角度倒角触发所对应的C型CFRP薄壁结构载荷响应对比

    Figure  4.  Comparison of load responses of C-channel CFRP thin-walled structures corresponding to different hybrid-angle chamfer triggers

    C45—45° chamfer trigger; H—Hybrid-angle chamfer trigger; 30/45—Hybrid angle is 30°/45°; 45/30—Hybrid angle is 45°/30°;45/60—Hybrid angle is 45°/60°; 60/45—Hybrid angle is 60°/45

    图  5  不同混合角度倒角触发所对应的C型CFRP薄壁结构吸能特性对比

    Figure  5.  Comparison of energy absorption characteristics of C-channel CFRP thin-walled structures corresponding to different hybrid-angle chamfer triggers

    SEA—Specific energy absorption

    图  6  不同混合角度倒角触发所对应的C型CFRP薄壁结构失效形貌对比

    Figure  6.  Comparison of failure morphologies of C-channel CFRP thin-walled structures corresponding to different hybrid-angle chamfer triggers

    S—Stress

    图  7  不同混合角度尖顶触发所对应的C型CFRP薄壁结构载荷响应对比

    Figure  7.  Comparison of load responses of C-channel CFRP thin-walled structures corresponding to different hybrid-angle steeple triggers

    S—Steeple trigger; O—Steeple trigger with hybrid angle on the outside; I—Steeple trigger with hybrid angle on the inside; IO—Steeple trigger with hybrid angles on the inside and outside; 45/60—Hybrid angle is 45°/60°; 60/45—Hybrid angle is 60°/45°

    图  8  不同混合角度尖顶触发所对应的C型CFRP薄壁结构吸能特性对比

    Figure  8.  Comparison of energy absorption characteristics of C-channel CFRP thin-walled structures corresponding to different hybrid-angle steeple triggers

    图  9  不同混合角度尖顶触发所对应的C型CFRP薄壁结构失效形貌对比

    Figure  9.  Comparison of failure morphologies of C-channel CFRP thin-walled structures corresponding to different hybrid-angle steeple triggers

    图  10  不同触发所对应的C型CFRP薄壁结构吸能特性对比

    Figure  10.  Comparison of energy absorption characteristics of C-channel CFRP thin-walled structures corresponding to different triggers

    图  11  C45、H45/30、H60/45、SIO45/60和SIO60/45所对应的C型CFRP薄壁结构失效过程对比

    Figure  11.  Comparison of failure process of C-channel CFRP thin-walled structures corresponding to C45, H45/30, H60/45, SIO45/60 and SIO60/45

    l—Crushing displacement

    表  1  T700/2510碳纤维/树脂复合材料材料及损伤参数[27, 30]

    Table  1.   T700/2510 carbon fiber/resin composite material and damage parameters[27, 30]

    ParameterValueParameterValue
    $ {E_{11}} $/GPa 55.8 $ {X_{{\text{2c}}}} $/MPa 703.3
    $ {E_{22}} $/GPa 54.9 $ {X_{12}} $/MPa 131
    $ {v_{12}} $ 0.043 $ G_{\text{f}}^{1{\text{t}}} $/(kJ·m−2) 125
    $ {G_{12}} $/GPa 4.2 $ G_{\text{f}}^{{\text{1c}}} $/(kJ·m−2) 250
    $ {X_{{\text{1t}}}} $/MPa 910.1 $ G_{\text{f}}^{{\text{2t}}} $/(kJ·m−2) 95
    $ X{}_{{\text{1c}}} $/MPa 710.2 $ G_{\text{f}}^{{\text{2c}}} $/(kJ·m−2) 245
    $ {X_{{\text{2t}}}} $/MPa 772.2
    Notes: $ {E_{11}} $/$ {E_{22}} $—Young's modulus in the longitudinal/transverse direction; $ {v_{12}} $—Poisson's ratio; $ {G_{12}} $—Shear modulus; $ {X_{{\text{1t}}}} $/$ {X_{{\text{1c}}}} $—Longitudinal tensile/compressive strength; $ {X_{{\text{2t}}}} $/$ {X_{{\text{2c}}}} $—Transverse tensile/compressive strength; $ {X_{12}} $—Shear strength; $ G_{\text{f}}^{{\text{1t}}} $/$ G_{\text{f}}^{{\text{1c}}} $—Tensile/compressive fracture energy in the longitudinal direction; $ G_{\text{f}}^{{\text{2t}}} $/$ G_{\text{f}}^{{\text{2c}}} $—Tensile/compressive fracture energy in the transverse direction.
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  • 收稿日期:  2022-10-31
  • 修回日期:  2022-12-16
  • 录用日期:  2022-12-29
  • 网络出版日期:  2023-01-12
  • 刊出日期:  2023-10-15

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