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温度对PVA/ECC动态压缩性能影响

刘泽军 王昌野 李艳 张文彬

刘泽军, 王昌野, 李艳, 等. 温度对PVA/ECC动态压缩性能影响[J]. 复合材料学报, 2022, 40(0): 1-14
引用本文: 刘泽军, 王昌野, 李艳, 等. 温度对PVA/ECC动态压缩性能影响[J]. 复合材料学报, 2022, 40(0): 1-14
Zejun LIU, Changye WANG, Yan LI, Wenbin ZHANG. Effect of temperature on dynamic compression properties of PVA/ECC[J]. Acta Materiae Compositae Sinica.
Citation: Zejun LIU, Changye WANG, Yan LI, Wenbin ZHANG. Effect of temperature on dynamic compression properties of PVA/ECC[J]. Acta Materiae Compositae Sinica.

温度对PVA/ECC动态压缩性能影响

基金项目: 国家自然科学基金(U1904188);河南省科技攻关项目(222102320431)
详细信息
    通讯作者:

    李艳,博士,教授,硕士生导师,研究方向为高性能混凝土及其结构设计 E-mail: liyan@hpu.edu.cn

  • 中图分类号: TU528.58

Effect of temperature on dynamic compression properties of PVA/ECC

  • 摘要: 为研究不同温度、不同聚乙烯醇(PVA)纤维体积掺量和不同应变率对高延性纤维增强水泥基复合材料(PVA/ECC)动态压缩性能的影响,采用直径50 mm分离式霍普金森压杆(SHPB),对高温浸水冷却后的PVA/ECC进行了冲击压缩试验,结果表明:当温度≥250℃,PVA/ECC试件冲击破坏后的整体性变差,应力-应变曲线更趋于扁平,其动态峰值应变提高不明显但动态峰值应力、冲击韧度显著降低,且高温对较大纤维体积掺量PVA/ECC动态峰值应力、冲击韧度的劣化效应更明显;温度≤150℃时,增大PVA纤维体积掺量,PVA/ECC动态峰值应力、峰值应变和冲击韧度均明显提高,但当温度≥250℃时,增大PVA纤维体积掺量,PVA/ECC动态峰值应变增大,而冲击韧度的提高幅度显著降低且动态峰值应力下降;高温水冷后的PVA/ECC仍具有明显的应变率效应,但温度≥150℃后,其抗压强度的应变率敏感性有所降低。

     

  • 图  1  PVA/高延性纤维增强水泥基复合材料(ECC)哑铃型试件单轴受拉试验

    Figure  1.  Tensile testing of dumbbell-shaped PVA/engineered fiber reinforced cementitious composite (ECC) specimens

    图  2  不同纤维掺量PVA/ECC试件单轴受拉应力-应变曲线

    Figure  2.  Tensile stress-strain curves of PVA/ECC specimens with different fiber volume contents

    图  3  SHPB试验装置示意图

    Figure  3.  Schematic diagram of SHPB test device

    4  PVA/ECC试件典型破坏形态

    4.  Typical failure patterns of PVA/ECC specimens

    图  5  PVA/ECC试件SEM显微图像[22]

    Figure  5.  SEM images of PVA/ECC specimens[22]

    图  6  不同温度下PVA/ECC试件平均应力-应变曲线

    Figure  6.  Average stress-strain curves of PVA/ECC specimens at different temperatures

    图  7  不同纤维掺量PVA/ECC试件平均应力-应变曲线

    Figure  7.  Average stress-strain curves of PVA/ECC specimens with different fiber contents

    图  8  不同应变率下PVA/ECC试件平均应力-应变曲线

    Figure  8.  Average stress-strain curves of PVA/ECC specimens at different strain rates

    图  9  PVA/ECC动态强度增长因子(μDIF)与应变率对数lgέ的关系

    Figure  9.  Relationship between dynamic increase factor (μDIF) and logarithm of strain rate lgέ of PVA/ECC

    10  不同温度下PVA/ECC试件冲击韧度对比

    10.  Impact toughness comparison of PVA/ECC specimens at different temperatures

    图  11  不同纤维掺量PVA/ECC试件冲击韧度对比

    Figure  11.  Impact toughness comparison of PVA/ECC specimens with different fiber contents

    图  12  不同应变率PVA/ECC试件冲击韧度对比

    Figure  12.  Impact toughness comparison of PVA/ECC specimens at different strain rates

    表  1  聚乙烯醇(PVA)纤维性能

    Table  1.   Properties of polyvinyl alcohol (PVA) fiber

    Diameter
    /μm
    Length
    /mm
    Elasticity modulus
    /GPa
    Ultimate strain
    /%
    Tensile strength
    /MPa
    Density
    /(g·cm-3)
    391242.87.016201.2
    下载: 导出CSV

    表  2  PVA/ECC试件拉伸试验结果

    Table  2.   PVA/ECC specimen tensile test results

    Fiber volume content/vol%Ultimate tensile strain εtu/%Tensile strength ftu/MPa
    0.50.423.01
    1.01.643.64
    1.52.814.16
    2.03.214.44
    下载: 导出CSV

    表  3  PVA/ECC试件动态压缩试验结果

    Table  3.   Test results of PVA/ECC specimens under dynamic compression

    SpecimenMeasured strain rate/s−1fcu/MPafc/MPafcd/MPaεP/10−6ST/(MJ·m−3)
    0.5vol%PVA/ECC-25-707443.4735.3052.966560.912
    0.5vol%PVA/ECC -25-909359.882001.132
    0.5vol%PVA/ECC -25-11011070.989301.334
    1.0vol%PVA/ECC -25-707544.8436.8960.974201.097
    1.0vol%PVA/ECC -25-909669.187601.449
    1.0vol%PVA/ECC -25-11011579.9106301.885
    1.5vol%PVA/ECC -25-707145.8037.5668.0105401.450
    1.5vol%PVA/ECC -25-909278.4110201.703
    1.5vol%PVA/ECC -25-11011187.8121902.301
    2.0vol%PVA/ECC -25-707246.2038.8474.8112401.738
    2.0vol%PVA/ECC -25-909385.1136502.156
    2.0vol%PVA/ECC -25-11011295.7147602.520
    0.5vol%PVA/ECC -150-707245.437.255.966700.945
    0.5vol%PVA/ECC -150-909163.083601.182
    0.5vol%PVA/ECC -150-11011274.990301.412
    1.0vol%PVA/ECC -150-707347.039.564.975501.153
    1.0vol%PVA/ECC -150-908974.088401.452
    1.0vol%PVA/ECC -150-11011182.9107501.877
    1.5vol%PVA/ECC -150-707250.140.671.8107001.456
    1.5vol%PVA/ECC -150-909481.4111601.733
    1.5vol%PVA/ECC -150-11011390.9123002.237
    2.0vol%PVA/ECC -150-707151.241.776.8114501.732
    2.0vol%PVA/ECC -150-909189.1138202.131
    2.0vol%PVA/ECC -150-11011297.0151002.505
    0.5vol%PVA/ECC -250-707338.231.544.869200.697
    0.5vol%PVA/ECC -250-909551.484300.925
    0.5vol%PVA/ECC -250-11011258.090601.093
    1.0vol%PVA/ECC -250-707236.829.642.975400.777
    1.0vol%PVA/ECC -250-909547.189301.003
    1.0vol%PVA/ECC -250-11011155.9112401.271
    1.5vol%PVA/ECC -250-707235.728.540.9108000.858
    1.5vol%PVA/ECC -250-909343.8112501.016
    1.5vol%PVA/ECC -250-11011553.1123501.301
    2.0vol%PVA/ECC -250-707334.127.238.5114600.914
    2.0vol%PVA/ECC -250-909141.4140601.073
    2.0vol%PVA/ECC -250-11011350.0151601.328
    0.5vol%PVA/ECC -350-707434.628.338.170600.593
    0.5vol%PVA/ECC -350-909143.991400.798
    0.5vol%PVA/ECC -350-11011252.193400.981
    1.0vol%PVA/ECC -350-707132.826.935.079000.677
    1.0vol%PVA/ECC -350-909239.991400.889
    1.0vol%PVA/ECC -350-11011347.8112601.034
    1.5vol%PVA/ECC -350-707231.225.233.3113500.697
    1.5vol%PVA/ECC -350-909136.9115600.899
    1.5vol%PVA/ECC -350-11011544.8128901.037
    2.0vol%PVA/ECC -350-707428.323.129.8119500.737
    2.0vol%PVA/ECC -350-909533.1141300.915
    2.0vol%PVA/ECC -350-11011540.0154801.068
    Notes: 0.5vol%PVA/ECC-25-70 represents that the fiber content by volume of PVA/ECC specimen is 0.5vol%, the temperature is 25℃, and the design strain rate is 70s−1; fcu is the cubic compressive strength of PVA/ECC; fc is the axial compressive strength of PVA/ECC; fcd is the dynamic peak strain of PVA/ECC; εP is the dynamic peak stress of PVA/ECC; ST is the impact toughness of PVA/ECC.
    下载: 导出CSV
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  • 收稿日期:  2021-12-08
  • 录用日期:  2022-03-09
  • 修回日期:  2022-02-25
  • 网络出版日期:  2022-03-30

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