Description of Brittle Behaviour of Alumina/Zirconia 2 Phase Ceramics

7th International Conference on Advanced Materials and Structures

Sadowski, T.^1 ; Marsavina, L.^2 ; Craciun, E.^3 ; Pietras, D.^1

Department of Solid Mechanics, Lublin University of Technology, Nadbystrzycka 40 str., Lublin

20-618, Poland^1

Polytechnika University Timisoara, Department Strength of Materials, Blvd. M.Viteazu 1, Timisoara

300222, Romania^2

Ovidius University of Constanta, Faculty of Mechanical, Industrial and Maritime Engineering, Bd. Mamaia 124, Consatanta

90052, Romania^3

关键词: Applied loading;    Brittle behaviours;    Critical elements;    Internal microstructure;    Loading process;    Monolithic ceramics;    Uni-axial compression;    Uniaxial tensions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/416/1/012059/pdf
DOI  :  10.1088/1757-899X/416/1/012059

来源: IOP

【 摘 要 】

Alumina/zirconia 2 phase ceramics is innovative composite material applied for thermal barrier coatings of critical elements of jet engines. Its internal microstructure is complex as it consists of: (1) 2 phases of monolithic ceramics, (2) initial porosity and (3) other technological defects. Moreover, during loading process one can observe gradual microcracking, which is strictly connected with the loading path. The actual microstructure becomes much more complex. The crucial point in description of the behaviour of 2 phase ceramics is correlation of microcracking processes with the type of applied loading, for example: uniaxial tension, uniaxial compression or 2D and 3D states of stress. This different gradual composite degradation in tension or compression is typical for brittle materials. Here we describe both microcracking models of 2 phase ceramics associated with types of loading.