FRACTURE-TOUGHNESS OF NIOBIUM/ALUMINA INTERFACES - AN ANALYSIS BASED ON A MICROMECHANICAL MODEL

被引：3
|
作者：
SHU, JY [1 ]
BLUME, JA [1 ]
SHIH, CF [1 ]
机构：
[1] BROWN UNIV, DEPT ENGN, PROVIDENCE, RI 02912 USA
来源：
ACTA METALLURGICA ET MATERIALIA | 1995年 / 43卷 / 12期
关键词：
Although the current model predicts trends that are in good agreement with experimental data; it is still approximate in the way it treats the plastic zone at the main crack tip. A more rigorous finite element analysis with an accurate representation of plastic deformation may yield a toughness curve which fits the experimental data even better. Furthermore; 3D effects of the penny-shaped microcracks ahead of the main crack may be important; Acknowledgements--Authors acknowledge the support of the Brown University Materials Research Group on Plasticity and Fracture; funded by the National Science Foun-dation. Suggestions from Dr N. A. Fleck were very helpful and greatly appreciated;
D O I：
10.1016/0956-7151(95)00125-F
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The fracture toughness is predicted for an interface between niobium and alumina. It is assumed that voids at the triple points of grain junctions on the interface are the sites of cleavage decohesion. These voids are treated as microcracks and the plastic zone is modelled by a cohesive zone of constant shear stress. The interaction between the microcrack and the main crack is studied using an integral equation approach. The fracture toughness is calculated via various fracture criteria and compared against experimental data. Scatter in the experimental data is related to the variability in microdefect size.
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页码：4301 / 4307
页数：7
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