IMPLICATIONS OF TRANSFORMATION PLASTICITY IN ZRO2-CONTAINING CERAMICS .1. SHEAR AND DILATATION EFFECTS
IMPLICATIONS OF TRANSFORMATION PLASTICITY IN ZRO2-CONTAINING CERAMICS .1. SHEAR AND DILATATION EFFECTS
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DOI：
10.1111/j.1151-2916.1986.tb07403.x
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发表时间：
1986-03-01
影响因子：
3.9
通讯作者：
MOREL, PER
中科院分区：
文献类型：
--
作者：
CHEN, IW;MOREL, PER
含ZrO 2陶瓷的相变塑性通常表现出相当大小的剪切和膨胀效应。外部应力和晶体学应变之间的耦合有助于四斜-单斜转变，其通过剪切局部化引起宏观剪切和塑性变形。基于剪切和膨胀效应的屈服准则的应用正确地关联了来自拉伸、压缩、弯曲和压痕的变形数据，并进一步描绘了与实验观察到的裂纹尖端过程区相当的裂纹尖端过程区。类似的剪切和膨胀效应，在微裂纹由于相变塑性进行了探讨。这些结果表明，最终相变增韧结构陶瓷的强度应受屈服限制，并对应力状态敏感。建议了裂缝控制策略。
Transformation plasticity in ZrO2‐containing ceramics generally exhibits shear and dilatation effects of comparable magnitude. The coupling between external stresses and crystallographic strains assists the tetragonal‐monoclinic transformation, which, via shear localization, gives rise to macroscopic shear and dilatant deformation. Application of a yield criterion based on both shear and dilatation effects correctly correlates deformation data from tension, compression, bending, and indentation, and further delineates a crack‐tip process zone comparable to the one observed experimentally. Similar shear and dilatation effects in microcracking due to transformation plasticity are explored. These findings suggest that the strength of the ultimate transformation‐toughened structural ceramics should be yield limited and sensitive to the stress state. Strategies for fracture control are recommended.