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聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟

刘晋铭 张寿松 周亭 尹青 谢伟

刘晋铭, 张寿松, 周亭, 等. 聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟[J]. 复合材料学报, 2023, 40(6): 3613-3625. doi: 10.13801/j.cnki.fhclxb.20220901.002
引用本文: 刘晋铭, 张寿松, 周亭, 等. 聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟[J]. 复合材料学报, 2023, 40(6): 3613-3625. doi: 10.13801/j.cnki.fhclxb.20220901.002
LIU Jinming, ZHANG Shousong, ZHOU Ting, et al. Influence of polyvinyl alcohol and ultrahigh molecular weight polyethylene fibers on dynamic mechanical properties of coral aggregate concrete and numerical simulation[J]. Acta Materiae Compositae Sinica, 2023, 40(6): 3613-3625. doi: 10.13801/j.cnki.fhclxb.20220901.002
Citation: LIU Jinming, ZHANG Shousong, ZHOU Ting, et al. Influence of polyvinyl alcohol and ultrahigh molecular weight polyethylene fibers on dynamic mechanical properties of coral aggregate concrete and numerical simulation[J]. Acta Materiae Compositae Sinica, 2023, 40(6): 3613-3625. doi: 10.13801/j.cnki.fhclxb.20220901.002

聚乙烯醇和超高分子量聚乙烯纤维对全珊瑚混凝土动态力学性能影响与数值模拟

doi: 10.13801/j.cnki.fhclxb.20220901.002
基金项目: 国家自然科学基金(51709200)
详细信息
    通讯作者:

    谢伟,本科,高级工程师,硕士生导师,研究方向为结构工程 E-mail: xieweixiongqi@163.com

  • 中图分类号: TU528;TB333

Influence of polyvinyl alcohol and ultrahigh molecular weight polyethylene fibers on dynamic mechanical properties of coral aggregate concrete and numerical simulation

Funds: Natural Science Foundation of China (51709200)
  • 摘要: 随着海洋资源的不断开发利用,在岛礁上就地取材制备全珊瑚混凝土已经成为岛礁工程建设与防护的关键技术。为探究不同有机非金属纤维掺量对全珊瑚混凝土的力学性能的影响,使用分离式霍普金森压杆(SHPB)试验研究其动态力学性能并采用LS-DYNA软件对冲击过程进行数值模拟。结果表明:当有机纤维质量分数为1.2wt%时,全珊瑚混凝土的静态抗压强度可达到113 MPa,相比未掺纤维的珊瑚混凝土增长了约7.5%。动态试验下,在应变率为120 s−1时动态抗压强度可达到247 MPa,比未掺加纤维的试样提高约32.6%。全珊瑚混凝土的韧性指标也随着有机纤维掺量的增加而增大。此外,随着有机纤维掺量的增加,珊瑚混凝土试件在相同冲击条件下完整性越高。动态强度试验值与模拟值的误差7%在允许误差内。

     

  • 图  1  不同粒径珊瑚集料

    Figure  1.  Coral aggregates with different particle sizes

    图  2  混凝土试样

    Figure  2.  Concrete specimens

    图  3  50 mm直锥变截面分离式霍普金森压杆(SHPB)装置示意图

    Figure  3.  Split hopkinson pressure bar (SHPB) diagram of 50 mm straight cone variable cross-section

    v—Velocity

    图  4  典型的力平衡图

    Figure  4.  Dynamic force balance for a typical text

    图  5  应变率-时程曲线

    Figure  5.  Strain rate-time history curve

    t0—Starting time of the constant loading platform segment; t1—Ending time of the constant loading platform segment

    图  6  PVA-UHMWPE/全珊瑚混凝土试件破坏形态

    Figure  6.  Failure modes of PVA-UHMWPE/coral aggregate concrete specimens

    图  7  PVA-UHMWPE/全珊瑚混凝土应力-应变曲线

    Figure  7.  Stress-strain curve of PVA-UHMWPE/coral aggregate concrete

    图  8  PVA-UHMWPE/全珊瑚混凝土动态压缩强度(a)和动态增长因子(b)随应变率的变化关系

    Figure  8.  Variation of dynamic compressive strength (a) and dynamic increase factor (b) with strain rate for PVA-UHMWPE/coral aggregate concrete

    图  9  混凝土韧性计算示意图

    Figure  9.  Schematic diagram of the calculation for toughness of concrete

    T—Toughness

    图  10  PVA-UHMWPE/全珊瑚混凝土韧性指标随纤维质量分数变化关系

    Figure  10.  Variation of toughness index of PVA-UHMWPE/coral aggregate concrete with the mass percent of organic fiber

    图  11  PVA-UHMWPE/全珊瑚混凝土有限元计算模型

    Figure  11.  Finite element calculation model of PVA-UHMWPE/coral aggregate concrete

    图  12  PVA-UHMWPE/全珊瑚混凝土应力-应变试验与模拟曲线

    Figure  12.  Stress-strain test and simulation curves of PVA-UHMWPE/coral aggregate concrete

    图  13  PVA-UHMWPE/全珊瑚混凝土不同应变率下破坏形态的数值模拟与实验结果

    Figure  13.  Numerical and experimental results of failure modes for PVA-UHMWPE/coral aggregate concretes under different strain rates

    表  1  目标混凝土配合比

    Table  1.   Mixing ratio of designed concrete

    Cement/
    (kg·m−3)
    Micro-silica/
    (kg·m−3)
    Slag/
    (kg·m−3)
    Cenos-phere/
    (kg·m−3)
    A1/
    (kg·m−3)
    A2/
    (kg·m−3)
    A3/
    (kg·m−3)
    Fiber mass
    percent/wt%
    Mixed water/
    (kg·m−3)
    Water reducing
    agent/(kg·m−3)
    567230140632406401200, 0.6, 1.22202.2
    Notes: A1—Coral fine sand (0.075-0.3 mm); A2—Coral medium sand (0.3-0.6 mm); A3—Coral coarse sand (0.6-1.18 mm).
    下载: 导出CSV

    表  2  不同纤维质量分数的PVA-UHMWPE/全珊瑚混凝土的力学参数

    Table  2.   Mechanical parameters of PVA-UHMWPE/coral aggregate concrete with different fiber mass percent

    Fiber
    mass fraction/wt%
    fcs/MPaEs/GPaStrain rate/s−1fDDynamic compressive
    strength/MPa
    Dynamic peak
    strain/10−3
    0105.3135.7853.61.22128.565.6
    69.41.44152.895.7
    126.91.78187.046.4
    0.6108.2636.2163.71.36147.165.3
    105.51.76191.065.4
    140.91.84199.706.1
    1.2113.2437.5669.81.39157.495.3
    101.61.86210.446.7
    137.12.19247.996.9
    Notes: fcs—Static compressive strength; Es—Static modulus of elasticity; fD—Dynamic increase factor.
    下载: 导出CSV

    表  3  PVA-UHMWPE/全珊瑚混凝土的HJC本构模型参数

    Table  3.   HJC model parameters for PVA-UHMWPE/coral aggregate concrete

    $ \rho $/(kg·m−3)Es/GPaABCNSf, maxfcs/MPa
    220035.780.791.600.0070.617105.31
    T/MPaS0εf, minPc/MPaUcPl/GPaUlD1
    6.3610.0135.100.0010.80.110.04
    D2K1/GPaK2/GPaK3/GPa
    1.085171208
    Notes: ρ—Density; Es—Elastic modulus; A, B, N, C, Sf, max—Strength parameter; fcs—Static compressive strength; T—Tensile strength; S0—Reference strain rate; εf, min—Minimum plastic strain; Pc—Crushing pressure; Uc—Crushing volumetric strain; Pl—Locking pressure; Ul—Volumetric strain at the locking pressure Pl; D1, D2—Damage constants; K1, K2, K3—Pressure constants.
    下载: 导出CSV

    表  4  PVA-UHMWPE/全珊瑚混凝土试验值与数值模拟值对比

    Table  4.   Comparison of experimental and numerical simulation values for PVA-UHMWPE/coral aggregate concretes

    Fiber mass fraction/wt%Strain rate/s−1Compressive strength/MPaAbsolute value of error/MPa
    Test valueSimulation value
    0 53.6 128.56 122.24 6.32
    69.4 152.89 159.66 6.77
    126.9 187.04 169.42 17.62
    0.6 63.7 147.16 153.13 5.97
    105.5 191.06 180.77 10.29
    140.9 199.70 197.83 1.87
    1.2 69.8 157.49 164.60 7.11
    101.6 210.44 198.62 11.82
    137.1 247.99 247.39 0.60
    下载: 导出CSV
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  • 收稿日期:  2022-06-17
  • 修回日期:  2022-08-22
  • 录用日期:  2022-08-25
  • 网络出版日期:  2022-09-02
  • 刊出日期:  2023-06-15

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