摘要
为了研究氟金云母微晶玻璃陶瓷的动态力学性能及断裂机理,利用高速液压伺服材料试验机进行了动态压缩实验,得到试样中等应变速率下的动态力学参数,结果表明该陶瓷材料具有明显的应变率效应,并基于损伤力学理论,得到了该材料的弹脆性动态损伤本构方程。通过对试样断口微观形貌的SEM观测,并结合纳米压痕实验,分析了材料的断裂机理。从试样断口的宏观和微观形貌可得:材料断裂方式为脆性解理断裂,云母相与玻璃相交界面存在大量沿晶微裂纹;由纳米压痕实验验证了两相之间弱界面的存在,微裂纹最早成核于两相交界处,并沿弱界面扩展,成核载荷为20 mN。
In order to study the dynamic mechanical properties and fracture mechanism of fluorophlogopite glass-ceramics, a dynamic compression test was carried out with a high-speed hydraulic servo testing machine, and the dynamic mechanical parameters of samples at medium strain rate were obtained. The results show that the ceramic material has an obvious strain rate effect. Based on damage mechanics theory, the dynamic damage constitutive equation of elastic brittleness is obtained. The fracture mechanism is analyzed by SEM observation of the samples fracture microstructure and nano-indentation tests. The fracture macroscopic and microcosmic morphology of samples show that the material fracture mode is of brittle cleavage fracture, and there are lots of microcracks at the interface between a mica phase and glass. The nano-indentation test verifies the existence of the weak interface between two phases. The microcracks are first nucleate at the junction of two phases and extend along the weak interface, and the nucleation load is 20 mN.
作者
李伟
于辉
刘利刚
苑旭冲
董洪旺
吴海兵
LI Wei;YU Hui;LIU Li-gang;YUAN Xu-chong;DONG Hong-wang;WU Hai-bing(College of Mechanical Engineering,Yanshan University,Qinhuangdao,Hebei 066000,China;Key Laboratory of Advanced Manufacturing Technology in Jiangsu Province,Huaian,Jiangsu 223001,China)
出处
《工程力学》
EI
CSCD
北大核心
2019年第11期241-247,256,共8页
Engineering Mechanics
基金
国家自然科学基金项目(51275445)
江苏省先进制造技术重点实验室基金项目(HGAMTL-1704)
关键词
氟金云母微晶玻璃陶瓷
动态压缩
本构方程
纳米压痕
断裂机理
fluorophlogopite glass-ceramics
dynamic compression
constitutive equation
nano-indentation
fracture mechanism