Design maps for failure of all-ceramic layer structures in concentrated cyclic loading
Design maps for failure of all-ceramic layer structures in concentrated cyclic loading
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DOI：
10.1016/j.actamat.2006.11.042
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发表时间：
2007-04-01
期刊：
影响因子：
9.4
通讯作者：
Lawn, Brian R.
中科院分区：
文献类型：
--
作者：
Bhowmick, Sanjit;Melendez-Martinez, Juan Jose;Lawn, Brian R.
一项研究是由陶瓷为基础的双层结构加入到聚合物为基础的基板，在模拟牙冠状结构的功能，但弱的“单板”层结合到一个强大的“核心”层的故障模式之间的竞争。循环接触疲劳试验在水中对由玻璃板连接到玻璃、蓝宝石、氧化铝或氧化锆支撑层（粘合到聚碳酸酯基底上）组成的模型平板系统进行。将每种裂纹模式失效的临界循环次数绘制为失效图上峰值接触载荷的函数，该失效图显示了每种断裂模式占主导地位的区域。在低周波条件下，径向和外锥裂纹是有竞争力的试样与氧化铝芯，而外锥裂纹占上风的试样与氧化锆芯;在高周波条件下，内锥裂纹占上风的所有情况下。其他因素的作用，如基板模量，层厚度，压头半径和残余应力从试样制备，被简要地考虑。由爱思唯尔有限公司代表Acta Materialia Inc.出版。
A study is made of the competition between failure modes in ceramic-based bilayer structures joined to polymer-based substrates, in simulation of dental crown-like structures with a functional but weak "veneer" layer bonded onto a strong "core" layer. Cyclic contact fatigue tests are conducted in water on model flat systems consisting of glass plates joined to glass, sapphire, alumina or zirconia support layers glued onto polycarbonate bases. Critical numbers of cycles to take each crack mode to failure are plotted as a function of peak contact load on failure maps showing regions in which each fracture mode dominates. In low-cycle conditions, radial and outer cone cracks are competitive in specimens with alumina cores, whereas outer cone cracks prevail in specimens with zirconia cores; in high-cycle conditions, inner cone cracks prevail in all cases. The roles of other factors, e.g. substrate modulus, layer thickness, indenter radius and residual stresses from specimen preparation, are briefly considered. Published by Elsevier Ltd on behalf of Acta Materialia Inc.