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飞艇用织物膜材单轴拉伸蠕变强度试验与模型

宋寅搏 陈务军 高成军 陈龙龙 王晓情 闫勇升

宋寅搏, 陈务军, 高成军, 等. 飞艇用织物膜材单轴拉伸蠕变强度试验与模型[J]. 复合材料学报, 2021, 39(0): 1-8
引用本文: 宋寅搏, 陈务军, 高成军, 等. 飞艇用织物膜材单轴拉伸蠕变强度试验与模型[J]. 复合材料学报, 2021, 39(0): 1-8
Yinbo SONG, Wujun CHEN, Chengjun GAO, Longlong CHEN, Xiaoqing WANG, Yongsheng YAN. Uniaxial tensile creep experiment and creep model of fabric for airship structures[J]. Acta Materiae Compositae Sinica.
Citation: Yinbo SONG, Wujun CHEN, Chengjun GAO, Longlong CHEN, Xiaoqing WANG, Yongsheng YAN. Uniaxial tensile creep experiment and creep model of fabric for airship structures[J]. Acta Materiae Compositae Sinica.

飞艇用织物膜材单轴拉伸蠕变强度试验与模型

基金项目: 国家自然科学基金 (51778362)
详细信息
    通讯作者:

    陈务军,博士,教授,博士生导师,研究方向为超轻航空、宇航、近空间结构构造物分析理论与设计技术 E-mail: cwj@sjtu.edu.cn

  • 中图分类号: TB332

Uniaxial tensile creep experiment and creep model of fabric for airship structures

  • 摘要: 聚酯纤维织物类膜材因其轻质高强、耐候性好等特点常被用于飞艇结构的蒙皮材料,其在高应力水平下的蠕变失效行为决定飞艇结构长期安全性能,但目前尚未有相关的性能测试标准及研究。为研究此类膜材的蠕变性能,选用以Vectran纤维为基布材料的膜材在极限应力的85%、80%、75%、70%四组应力水平下进行单轴拉伸蠕变试验,分析了蠕变过程中膜材应变、模量以及蠕变破坏时间等参数关于应力水平的变化规律,并给出基于应力水平的蠕变强度包络线拟合公式;通过牛顿迭代法建立了参数化的四单元蠕变模型及蠕变破坏准则,可以较为准确反映材料在高应力水平下的蠕变破坏规律。

     

  • 图  1  Vectran-PVF织物膜材的细观结构

    Figure  1.  Mesostructure of Vectran-PVF fabric material

    图  2  Vectran-PVF膜材试样尺寸及试验方案

    Figure  2.  Configuration of Vectran-PVF fabric specimens and experimental scheme

    图  3  Vectran-PVF膜材蠕变应变曲线阶段划分

    Figure  3.  Stage division of Vectran-PVF fabric creep strain curve

    图  4  各应力水平下的Vectran-PVF膜材试样应变值

    Figure  4.  Strain comparison of Vectran-PVF fabric specimens under various stress levels

    图  5  各应力水平下Vectran-PVF膜材试样的蠕变应变曲线

    Figure  5.  Creep strain curves of Vectran-PVF fabric specimens under various stress levels

    图  6  各应力水平下Vectran-PVF膜材试样的蠕变模量曲线

    Figure  6.  Creep modulus curves of Vectran-PVF fabric specimens under various stress levels

    图  7  基于应力水平的Vectran-PVF膜材蠕变强度包络线

    Figure  7.  Envelope of Vectran-PVF fabric creep strength based on stress levels

    图  8  基于蠕变强度包络线的Vectran-PVF膜材试样寿命预测

    Figure  8.  Life prediction based on Vectran-PVF fabric creep strength envelope

    图  9  宏观和细观尺度的Vectran-PVF膜材试样破坏形态

    Figure  9.  Macroscopic and mesoscopic views of Vectran-PVF fabric specimen failure

    图  10  聚合物的四单元蠕变模型

    Figure  10.  Common creep model of polymers based on combination of spring elements and dashpot elements

    图  11  蠕变模型与Vectran-PVF膜材蠕变试验结果对比

    Figure  11.  Comparison between Vectran-PVF fabric creep model and experimental results

    表  1  Vectran-PVF膜材蠕变试验设备及参数

    Table  1.   Instruments parameters of Vectran-PVF fabric creep testing

    Test equipmentMeasuring rangeAccuracyError
    Electronic universal testing machine0~5000 N0.1 N±0.5%
    Displacement meter0~800 mm0.008 mm±1%
    Thickness gauge0~12.7 mm0.001 mm±1%
    下载: 导出CSV

    表  2  Vectran-PVF膜材模型预测带与试验结果的极限应变值对比

    Table  2.   Comparison of ultimate strain values of Vectran-PVF fabric between model prediction zone and test results

    StressUltimate strain/%Error/%
    ExperimentCreep model
    85%σu2.402.33-2.550.0
    80%σu2.332.29-2.370.0
    75%σu2.222.04-2.105.4
    70%σu2.111.78-1.8910.4
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-09-14
  • 录用日期:  2021-11-08
  • 修回日期:  2021-10-26
  • 网络出版日期:  2021-12-07

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