Al2O3陶瓷动静态压缩下碎片形貌与破坏机理分析

谈瑞 李海洋 黄俊宇

谈瑞, 李海洋, 黄俊宇. Al2O3陶瓷动静态压缩下碎片形貌与破坏机理分析[J]. 爆炸与冲击, 2020, 40(2): 023103. doi: 10.11883/bzycj-2019-0050
引用本文: 谈瑞, 李海洋, 黄俊宇. Al2O3陶瓷动静态压缩下碎片形貌与破坏机理分析[J]. 爆炸与冲击, 2020, 40(2): 023103. doi: 10.11883/bzycj-2019-0050
TAN Rui, LI Haiyang, HUANG Junyu. Investigations on the fragment morphology and fracture mechanisms of Al2O3 ceramics under dynamic and quasi-static compression[J]. Explosion And Shock Waves, 2020, 40(2): 023103. doi: 10.11883/bzycj-2019-0050
Citation: TAN Rui, LI Haiyang, HUANG Junyu. Investigations on the fragment morphology and fracture mechanisms of Al2O3 ceramics under dynamic and quasi-static compression[J]. Explosion And Shock Waves, 2020, 40(2): 023103. doi: 10.11883/bzycj-2019-0050

Al2O3陶瓷动静态压缩下碎片形貌与破坏机理分析

doi: 10.11883/bzycj-2019-0050
基金项目: 国家自然科学基金(11802252)
详细信息
    作者简介:

    谈 瑞(1994- ),女,硕士研究生,r__tan@163.com

    通讯作者:

    黄俊宇(1989- ),男,博士,副教授,jyhuang@pims.ac.cn

  • 中图分类号: O347.4

Investigations on the fragment morphology and fracture mechanisms of Al2O3 ceramics under dynamic and quasi-static compression

  • 摘要: 为探究Al2O3陶瓷的宏观力学响应与破坏机理,分别利用材料试验机和分离式霍普金森压杆对其进行准静态和动态压缩实验,同时通过原位光学成像观测试样的破坏过程,并利用同步辐射CT和扫描电镜(SEM)对回收碎片的尺寸和形状以及微观破坏模式进行表征分析。宏观强度数据表明,Al2O3陶瓷的抗压强度符合Weibull分布,且与加载应变率呈现指数增长关系。原位光学成像和SEM回收分析共同揭示了动静态加载下裂纹成核与扩展模式存在明显差异。准静态加载时材料微观上更易发生沿晶断裂,宏观表现为劈裂裂纹较少,且倾向于沿加载方向传播并贯穿整个试样;而动态加载时穿晶断裂占主导地位,劈裂裂纹明显增加并发生相互作用,因此在传播过程中容易分叉而形成大量次生裂纹,提高了试样内裂纹密度。这与碎片的CT表征结果一致,即碎片平均球形度和伸长、扁平指数等均随应变率对数线性增加。破坏模式的改变最终导致高应变率下陶瓷材料应变率敏感性显著增强。
  • 图  1  分离式霍普金森压杆及原位光学成像系统示意图

    Figure  1.  Schematic diagram of the SHPB device implemented with an in-situ optical imaging system

    图  2  SHPB实验数据处理

    Figure  2.  Data processing in SHPB experiments

    图  3  Al2O3陶瓷的压缩破坏强度

    Figure  3.  Compressive fracture strength of Al2O3 ceramics

    图  4  Al2O3陶瓷在应变率为0.001 s−1的准静态 压缩下的原位光学成像结果

    Figure  4.  In-situ optical imaging of the Al2O3 ceramics under quasi-static compression at 0.001 s−1

    图  5  Al2O3陶瓷在应变率为1 000 s −1的动态压缩下的原位光学成像结果

    Figure  5.  In-situ optical imaging of the Al2O3 ceramics under dynamic compression at 1 000 s −1

    图  6  不同应变率下碎片的三维图像与等效直径分布情况

    Figure  6.  Volume renderings and the equivalent diameter of fragments at different strain rates

    图  7  碎片形状参数(均值和标准差)随应变率的变化关系

    Figure  7.  Evolution of the shape parameters (mean and standard deviations) of the fragments with the strain rate

    图  8  不同应变率下碎片的SEM图

    Figure  8.  SEM micrographs of fragments at different strain rates

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出版历程
  • 收稿日期:  2019-02-22
  • 修回日期:  2019-04-01
  • 网络出版日期:  2019-12-25
  • 刊出日期:  2020-02-01

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