平板冲击下氧化铝陶瓷弹性前驱波衰减的细观机理

发布时间：2018-03-14 08:39

  本文选题：冲击压缩　切入点：氧化铝陶瓷　出处：《物理学报》2016年16期 　论文类型：期刊论文

【摘要】：利用一级轻气炮开展了不同厚度氧化铝陶瓷样品的平板冲击压缩实验,并借助激光速度干涉仪(VISAR)测试了样品的自由面速度历程.根据自由面速度历程确定了不同厚度氧化铝陶瓷样品的Hugoniot弹性极限值,结果显示,冲击压缩下氧化铝陶瓷中存在弹性前驱波衰减现象.进一步基于氧化铝陶瓷的细观结构扫描电镜(HEL)图像,分析了氧化铝陶瓷的细观结构特征,构建了含晶相、玻璃相等细观特征的力学模型.数值模拟冲击压缩加载下氧化铝陶瓷细观结构的力学响应过程,从细观层次上分析了弹性前驱波衰减现象的产生机理,指出冲击压力低于HEL时材料的细观损伤引起的能量耗散以及前驱波在细观结构晶界处反射和透射引起的能量分散过程是其产生的主要原因.
[Abstract]:The plate impact compression experiments of alumina ceramic samples with different thickness were carried out by the first-order light gas gun. The free surface velocity history of the samples was measured by using the laser velocity interferometer (VISAR). According to the free surface velocity history, the Hugoniot elastic limit values of alumina ceramic samples with different thickness were determined. The results show that, The phenomenon of elastic front wave attenuation exists in alumina ceramics under impact compression. Based on the SEM images of alumina ceramics, the microstructure characteristics of alumina ceramics are analyzed, and the crystalline phases are constructed. The mechanical response process of alumina ceramic meso-structure under shock compression loading was numerically simulated. The mechanism of elastic front wave attenuation was analyzed from the meso level. It is pointed out that the energy dissipation caused by the meso-damage of the material and the energy dispersion caused by the reflection and transmission of the precursor wave at the grain boundary of the mesoscopic structure are the main reasons for the energy dissipation when the impact pressure is lower than HEL.
【作者单位】： 中国工程物理研究院总体工程研究所;
【基金】：国家自然科学基金(批准号:11502258,11272300) 中国工程物理研究院科学技术发展基金(批准号:2014B0101009)资助的课题~~
【分类号】：O343
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本文编号：1610444