摘要
为探究工程陶瓷边缘碎裂损伤规律与机理,建立工程陶瓷的单晶压痕边缘碎裂实验系统,分析了工程陶瓷边缘碎裂损伤演化过程的能量转化和释放特征,结合断口表面形貌,从能量的角度研究了工程陶瓷边缘碎裂的损伤规律与机理。结果表明:工程陶瓷的边缘碎裂过程具有显著的突变特征,在缓慢断裂期,裂纹扩展缓慢,陶瓷材料内部以穿晶断裂为主,绝大部分机械能通过晶粒变形的方式转变为弹性应变能;在瞬断期,裂纹扩展迅速,弹性应变能通过沿晶断裂、相对运动和滑移等形式转化为动能、表面能、损伤能、摩擦热能和辐射能等。幅值和释能率可较好地反映其损伤演化过程的能量释放特征。
An edge chipping experiment system by single indenter for engineering ceramics was established, and energy transformations and the energy releases during the fracture process were analyzed, the fracture micrographs were observed by SEM to study the fracture regulars and mechanisms of edge chipping from the aspect of energy. The results showed： There ＂s obviously catastrophe characteristics for engineering ceramics during the failure process of edge chipping; During the process of slow fracture, the cracks propagate slowly, and the modes of crack propagations are mainly transcrystalline rupture, most of the mechanical energies convert to elastic strain energies by grain deformations; While during the process of rapid fracture, the cracks propagate quickly, the elastic strain energies would convert to kinetic energy, surface energy, damage energy and so on by intergranular fracture, relative motion and slipping. Amplitude and energy can describe the energy release properties of engineering ceramics during the failure well.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第10期2049-2054,2058,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(51105378)
装甲兵工程学院创新基金(2012CJ073)
关键词
工程陶瓷
边缘碎裂
能量释放
声发射
engineering ceramic
edge chipping
energy release
acoustic emission
