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Mechanical behaviors and damage constitutive model of ceramics under shock compression

ISSN号：0567-7718
期刊名称：Acta Mechanica Sinica
时间：0
页码：305-315
语言：英文
分类：O34[理学—固体力学;理学—力学]
作者机构：[1]State Key Laboratory ot Explosion Science and Technology,Beijing Institute of Technology, 100081 Beijing, China, [2]Laboratory for Shock Wave and Detonation Physics Research,Institute of Fluid Physics, CAEE 621900 Mianyang, China
相关基金：The project supported by the National Natural Science Foundation of China （10632080, 10625208, 10772027）.
相关项目：陶瓷材料的动态力学特性和抗侵彻机理研究

关键词：拉格朗日分析, 机械性质, 张力, 裂缝, 压缩力, Mechanical behaviors , Lagrange analysis , Damage , Tensile wing crack

中文摘要：

一个阶段轻煤气的枪被利用学习受到装载的吃惊的 AD90 氧化铝的动态机械性质。锰铜计量器被采用获得压力时间历史。为任何反射镜(VISAR ) 的速度干涉仪系统被用来获得免费表面速度侧面并且决定 Hugoniot 有弹性的限制。Hugoniot 曲线与试验性的数据被适合。从 Hugoniot 曲线， AD90 氧化铝的压缩行为被发现从橡皮典型地改变到“塑料”。为在影响装载下面的氧化铝的动态机械行为被使用 Lagrange 分析的路径线原则分析，包括在材料的冲击波的非线性的特征，紧张率依赖，分散和偏斜。对受到动态压缩装载的陶艺适用的一个损坏模型被开发了。模型基于损坏微力学和翅膀裂缝成核和生长。动态破裂力量上的微裂缝的成核和起始的裂缝尺寸的参数的效果被讨论。动态损坏进化模型的结果与试验性的结果相比，一个好协议被发现。

英文摘要：

One-stage light gas gun was utilized to study the dynamic mechanical properties of AD90 alumina subjected to the shock loading. Manganin gauges were adopted to obtain the stress-time histories. The velocity interferometer system for any reflector （VISAR） was used to obtain the free surface velocity profile and determine the Hugoniot elastic limit. The Hugoniot curves were fitted with the experimental data. From Hugoniot curves the compressive behaviors of AD90 alumina were found to change typically from elastic to ＂plastic＂. The dynamic mechanical behaviors for alumina under impact loadings were analyzed by using the path line principle of Lagrange analysis, including the nonlinear characteristics, the strain rate dependence, the dispersion and declination of shock wave in the material. A damage model applicable to ceramics subjected to dynamic compressive loading has been developed. The model was based on the damage micromechanics and wing crack nucleation and growth. The effects of parameters of both the micro-cracks nucleation and the initial crack size on the dynamic fracture strength were discussed. The results of the dynamic damage evolution model were compared with the experimental results and a good agreement was found.

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