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不同应变率下蓝宝石透明陶瓷玻璃的力学响应

牛欢欢 闫晓鹏 罗浩舜 陈佳君 李志强

牛欢欢, 闫晓鹏, 罗浩舜, 陈佳君, 李志强. 不同应变率下蓝宝石透明陶瓷玻璃的力学响应[J]. 爆炸与冲击. doi: 10.11883/bzycj-2021-0434
引用本文: 牛欢欢, 闫晓鹏, 罗浩舜, 陈佳君, 李志强. 不同应变率下蓝宝石透明陶瓷玻璃的力学响应[J]. 爆炸与冲击. doi: 10.11883/bzycj-2021-0434
NIU Huanhuan, YAN Xiaopeng, LUO Haoshun, CHEN Jiajun, LI Zhiqiang. Mechanical response of sapphire transparent ceramic glass at different strain rates[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2021-0434
Citation: NIU Huanhuan, YAN Xiaopeng, LUO Haoshun, CHEN Jiajun, LI Zhiqiang. Mechanical response of sapphire transparent ceramic glass at different strain rates[J]. Explosion And Shock Waves. doi: 10.11883/bzycj-2021-0434

不同应变率下蓝宝石透明陶瓷玻璃的力学响应

doi: 10.11883/bzycj-2021-0434
基金项目: 国家自然科学基金(11972244)
详细信息
    作者简介:

    牛欢欢(1996- ),男,硕士研究生,1137390516@qq.com

    通讯作者:

    李志强(1973- ),男,教授,lizhiqiang@tyut.edu.cn

  • 中图分类号: O342

Mechanical response of sapphire transparent ceramic glass at different strain rates

  • 摘要: 蓝宝石(A12O3)是透明陶瓷玻璃,它相较传统陶瓷(A12O3)有优良的透光性,而且保留了陶瓷优良的力学性能。利用电子拉伸机和分离式霍普金森杆设备对试样进行准静态应变率为(10−4、10−3、10−2s−1)和3种动态应变率(850、1 100、1 300、1 450 s−1)下的单轴压缩力学行为,用高速摄像机记录了蓝宝石透明陶瓷玻璃试样在准静态和动态压缩下的破坏过程。实验结果表明:从加载过程中的应力应变曲线是由加载段和失效段组成的,该材料是典型的脆性材料,并且有明显的应变率效应,随着应变率的提高,蓝宝石透明陶瓷玻璃的抗压强度也会提高;准静态和动态压缩下蓝宝石透明陶瓷玻璃都是在宏观裂纹扩展作用下失效破坏。通过分析不同应变率下蓝宝石透明陶瓷玻璃的破坏过程,分析得到该材料的失效是在加载的过程中,在蓝宝石透明陶瓷玻璃承载能力最低的区域出现裂纹源,然后裂纹成形并沿着加载方向扩展,然后裂纹之间相互交错,最终达到饱和状态破坏失效;在高应变率下,极短的时间内产生多处裂纹源,需要更大的能量去使裂纹成形、扩展,宏观上就表现为应变率效应。
  • 图  1  试样

    Figure  1.  Samples

    图  2  电子拉伸机及实验设备

    Figure  2.  Electronic stretching machine and experimental equipment

    图  3  SHPB设备示意图

    Figure  3.  Schematic diagram of SHPB device

    图  4  准静态实验结果

    Figure  4.  Quasi static experimental results

    图  5  强度-时间曲线

    Figure  5.  Strength time curve

    图  6  准静态下试样破坏过程

    Figure  6.  Failure process of specimen under quasi-static state

    图  7  动态压缩中的经典信号

    Figure  7.  Classic signal in dynamic compression

    图  8  真实应力和真实应变率随真实应变的变化

    Figure  8.  Variation of real stress and real strain rate with real strain

    图  9  动态实验结果

    Figure  9.  Dynamic experimental results

    图  10  动态压缩下试件的破坏过程

    Figure  10.  Failure process of specimen under dynamic compression

    图  11  实验数据拟合曲线

    Figure  11.  Fitting curve of experimental data

    图  12  破坏原理示意图

    Figure  12.  Schematic diagram of failure principle

    表  1  准静态实验试样的破坏强度

    Table  1.   Failure strength of the specimen quasi-static test

    应变率/s−1破坏强度/MPa平均值
    试件1试件2试件3
    10−41004.6351061.7801051.3501039.255
    10−31172.8461074.2801085.6871110.937
    10−21251.4471239.0341274.6101255.030
    下载: 导出CSV

    表  2  动态压缩实验结果

    Table  2.   Dynamic experimental results

    应变率/s−1强度/MPa失效应变
    8502044.3330.0210
    11002168.5330.0180
    13002385.3910.0155
    14502753.9090.0130
    下载: 导出CSV
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  • 收稿日期:  2021-10-18
  • 修回日期:  2022-02-21
  • 网络出版日期:  2022-03-29

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