氧化铝陶瓷受冲击压缩破坏的细观机理研究

发布时间：2018-05-30 02:20

本文选题：固体力学 + 冲击压缩　；参考：《兵工学报》2017年12期

【摘要】：利用激光速度干涉仪VISAR测试了平板冲击压缩下不同厚度氧化铝陶瓷样品的自由面速度历程。根据自由面速度历程上表征"破坏波"现象的二次压缩信号计算获得了破坏波的传播轨迹,指出陶瓷中破坏波的形成传播机制主要由细观力学行为控制。进一步基于氧化铝陶瓷的细观扫描图像,构建了含晶相、玻璃相等细观特征的力学模型。数值模拟了冲击压缩下陶瓷材料的细观破坏过程,从细观层次分析了破坏波的形成传播机理。结果表明,陶瓷中破坏阵面的形成主要依赖于原生微缺陷在冲击载荷下的快速形核扩展过程,其传播特性满足扩散过程。
[Abstract]:The free surface velocity history of alumina ceramic samples with different thickness under plate impact compression was measured by laser velocity interferometer (VISAR). According to the calculation of the secondary compression signal which represents the phenomenon of "failure wave" in the free surface velocity history, the propagation track of the failure wave is obtained. It is pointed out that the formation and propagation mechanism of the failure wave in ceramics is mainly controlled by the meso-mechanical behavior. Based on the meso-scanning images of alumina ceramics, a mechanical model with the equivalent meso-features of crystalline phase and glass was constructed. The mesoscopic failure process of ceramic materials under impact compression is numerically simulated, and the mechanism of formation and propagation of failure waves is analyzed from the meso level. The results show that the formation of the failure surface in ceramics mainly depends on the rapid nucleation and propagation process of the primary microdefects under impact loading, and its propagation characteristics satisfy the diffusion process.
【作者单位】：中国工程物理研究院总体工程研究所;
【基金】：国家自然科学基金项目(11502258、11272300) 中国工程物理研究院科学技术发展基金项目(2014B0101009)
【分类号】：TQ174.1

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