摘要
采用实验的方法研究全瓷冠切片在受触压载荷下的破坏机制。制作了新颖的全瓷冠切片模型,平板层状切片模型的破坏模式验证了切片模型的可行性,颊舌向切片试件不仅具有锥形裂纹和放射状裂纹,还具有肩台脱粘新型破坏模式。结合高分辨率的图像采集系统,应用数字图像相关法分析研究两种类型试件的微裂纹产生和扩展过程,精确地确定了微裂纹产生时的临界载荷大小。为在实验室环境中研究全瓷冠的破坏机制和使用寿命提供了实际测试手段。
The experimental investigation was carded out to explore the fracture mechanism of all-ceramics under occlusal contact loads in this paper. A novel sectioned crown specimen was designed such that digital image correlation （DIC） can be used to identify the crack initiation and propagation in ceramic layers. Results from the fiat trilayer sectioned specimens had good agreement with the well established fracture theory for ceramics, while the facial-lingual sectioned crown has debonding at crown shoulder besides the regular conic and radial cracking. Combined with high resolution imaging system, DIC was applied to detect the initiation and extending of cracks. The proposed experimental method provides an essential routine in studying the fracture mechanism of all ceramic crowns under either static or fatigue occlusal loads.
出处
《工程力学》
EI
CSCD
北大核心
2009年第12期246-248,256,共4页
Engineering Mechanics
基金
国家自然科学基金项目(30672348
10772111)
上海市浦江计划(2006)
关键词
生物力学
全瓷冠
数字图像相关法
触压实验
裂纹
biomechanics
all-ceramic crown
digital image correlation
Hertz contact test
crack
