Study on Fracture Regulars and Mechanisms of Edge Chipping for Engineering Ceramics Based on Energy
Study on Fracture Regulars and Mechanisms of Edge Chipping for Engineering Ceramics Based on Energy
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发表时间：
2013
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通讯作者：
Tang Xiu-jia
中科院分区：
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作者：
Tang Xiu-jia
建立了工程陶瓷单头切边实验系统，分析了断裂过程中的能量转换和能量释放，用扫描电子显微镜对断口进行了观察，从能量的角度研究了切边的断裂规律和机理。结果表明：工程陶瓷在切边破坏过程中具有明显的突变特征：在慢速断裂过程中，裂纹扩展缓慢，裂纹扩展方式主要是穿晶断裂，大部分机械能通过颗粒变形转化为弹性应变能；而在快速断裂过程中，裂纹快速扩展，弹性应变能通过沿晶断裂、相对运动和滑移等方式转化为动能、表面能、损伤能等，其幅值和能量可以描述工程陶瓷在井边崩裂破坏过程中的能量释放特性。
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 process of edge chipping well.