人造结石的静动态巴西劈裂试验研究

顾春苗 刘冠琳 周风华 李科斌

顾春苗, 刘冠琳, 周风华, 李科斌. 人造结石的静动态巴西劈裂试验研究[J]. 高压物理学报, 2024, 38(5): 054105. doi: 10.11858/gywlxb.20240738
引用本文: 顾春苗, 刘冠琳, 周风华, 李科斌. 人造结石的静动态巴西劈裂试验研究[J]. 高压物理学报, 2024, 38(5): 054105. doi: 10.11858/gywlxb.20240738
GU Chunmiao, LIU Guanlin, ZHOU Fenghua, LI Kebin. Study on Static and Dynamic Brazilian Splitting Test of Artificial Stones[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054105. doi: 10.11858/gywlxb.20240738
Citation: GU Chunmiao, LIU Guanlin, ZHOU Fenghua, LI Kebin. Study on Static and Dynamic Brazilian Splitting Test of Artificial Stones[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 054105. doi: 10.11858/gywlxb.20240738

人造结石的静动态巴西劈裂试验研究

doi: 10.11858/gywlxb.20240738
基金项目: 国家自然科学基金(12202217);宁波市自然科学基金(2021J122)
详细信息
    作者简介:

    顾春苗(1996- ),男,硕士研究生,主要从事冲击动力学研究. E-mail:gcm842343496@foxmail.com

    通讯作者:

    李科斌(1988- ),男,博士,讲师,主要从事冲击动力学、生物力学研究. E-mail:likebin@nbu.edu.cn

  • 中图分类号: O521.3; O347

Study on Static and Dynamic Brazilian Splitting Test of Artificial Stones

  • 摘要: 为探讨人造结石在不同条件下的力学性能,制备了不同配比(硬度、孔隙率、粉水比、蛋白含量)的牙科石膏试样(人造结石),对其开展准静态巴西劈裂试验,并利用$\varnothing$40 mm 分离式霍普金森压杆进行动态加载,结合高速相机、数字图像相关等测试方法观察试样在劈裂过程中的破坏过程以及应变场演化规律,获得应变时程曲线。试验结果表明:人造结石的准静态拉伸强度与硬度、粉水比成正比,与孔隙率成反比,而蛋白质含量对拉伸强度的影响不大,但会影响其韧脆性。在动态加载下,人造结石试样具有明显的应变率强化效应,拉伸强度动态增强因子与应变率对数之间呈线性增长关系。研究方法为人造结石的力学特性研究提供了一种有效的实验方法和分析手段。

     

  • 图  弧形加载装置

    Figure  1.  Arc loading device

    图  动态巴西劈裂试验计算模型

    Figure  2.  Calculation model of dynamic Brazilian splitting test

    图  不同硬度的牙科石膏试件

    Figure  3.  Dental plaster sample with different hardnesses

    图  准静态巴西劈裂测试系统

    Figure  4.  Quasi-static Brazilian splitting test system

    图  动态巴西劈裂试验装置示意图

    Figure  5.  Schematic diagram of dynamic Brazilian splitting test device

    图  试样2-4-1的加载时程曲线

    Figure  6.  Loading-time curve of specimen 2-4-1

    图  试样2-4-1的裂纹扩展过程

    Figure  7.  Crack growth process of specimen 2-4-1

    图  不同参数条件下人造结石的抗拉强度变化

    Figure  8.  Changes in tensile strength of artificial stones under different variables

    图  试样2-4-1的表面应变场演化云图

    Figure  9.  Evolution of surface strain field of specimen 2-4-1

    图  10  试样2-4-1中心位置的拉伸应变时程曲线

    Figure  10.  Strain-time curve at the center of specimen 2-4-1

    图  11  试样2-4-1的应力-应变曲线

    Figure  11.  Stress-strain curves of specimen 2-4-1

    图  12  应力平衡检验结果

    Figure  12.  Stress balance test results

    图  13  动态巴西劈裂破坏过程

    Figure  13.  Dynamic Brazilian splitting failure process

    图  14  不同冲击气压下试样的应变时程曲线

    Figure  14.  Strain-time curves under different air pressure

    图  15  动态抗拉强度的应变率效应

    Figure  15.  Strain rate effects on dynamic tensile strength

    表  1  草酸钙结石和BegoStone石膏的部分物理参数[8]

    Table  1.   Some physical parameters of calcium oxalate stones and BegoStone[8]

    Material CL/(m·s–1) CT/(m·s–1) ρ/(kg·m³) ZL/(kg∙m−2∙s−1) ZT/(kg∙m−2∙s−1) μ E/GPa K/GPa G/GPa
    COM 4476±41 2247±16 1823±69 8.160 4.096 0.332 24.259 9.204 9.204
    BegoStone 4400±65 2271±18 2174±29 9.568 4.939 0.318 29.584 30.890 11.221
    下载: 导出CSV

    表  2  试样的分组情况

    Table  2.   Sample details list

    Hardness/MPa Porosity/%
    1-1 1-2 1-3 1-4 2-1 2-2 2-3 2-4
    60 100 220 300 5 15 20 25
    Protein content/% Powder-to-water ratio
    3-1 3-2 3-3 3-4 3-5 4-1 4-2 4-3 4-4
    1.0 1.5 2.0 2.5 3.0 6.0∶1 5.0∶1 4.0∶1 3.5∶1
    下载: 导出CSV

    表  3  动态加载试验中试样的物理参数

    Table  3.   Physical parameters of specimen in dynamic loading test

    Density/
    (kg·m–3)
    E/GPa Hardness/
    MPa
    Powder to
    water ratio
    Porosity/%
    Tensile
    strength/MPa
    Compressive
    strength/MPa
    2264.80 31 300 6.0∶1 5 4.64 44.29
    下载: 导出CSV

    表  4  试样的的动态巴西劈裂试验结果

    Table  4.   Dynamic Brazilian splitting test results of specimen

    Specimen No. Air pressure/MPa Tensile strength/MPa Average tensile strength/MPa
    1-1 0.2 13.47
    1-2 0.2 13.61 13.46
    1-3 0.2 13.30
    2-1 0.4 20.60
    2-2 0.4 18.78 20.30
    2-3 0.4 21.51
    3-1 0.6 29.23
    3-2 0.6 27.11 28.20
    3-3 0.6 28.26
    下载: 导出CSV
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出版历程
  • 收稿日期:  2024-02-29
  • 修回日期:  2024-03-20
  • 刊出日期:  2024-09-29

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