Fatigue crack growth mechanism in ferroelectric ceramics under alternating electric field: An investigation by digital image correlation technique

Li，Yingwei1,2,3; Chen，Zeji1; Duan，Guan1,4

2022-08-15

10.1016/j.actamat.2022.118065

ACTA MATERIALIA   影响因子和分区

1359-6454

The deformation of crack tip in PZT ceramics under cyclic electric field loading was characterized by Digital Image Correlation (DIC) technique. Two other specimens without speckles were used to observe the physical processes during the crack propagation in-situ. The deformation of the region of interest is elucidated. Near the U-shaped notch, the DIC results directly reveal the existence of incompatible deformation. However, in the front of the newly formed crack, no incompatible deformation was observed. Additionally, in-situ observation reveals that, the crack growth occurs at the stage of crack closure when the crack propagates steadily. The observed pop-in behavior of the crack during the first cycle of electric field loading is rationalized by the interaction between the incompatible domain switching zones with and without U-shaped notch, which is consistent with the explanation of Westram et al. The subsequent crack propagation after the pop-in cannot be rationalized by the model exploited by Zhu and Yang, Westram et al., and Liu and Fang, which is thought to be related to three different factors – arcing, wedging and grain-to-grain interaction. The mechanism for the appearance and the disappearance of the incompatible domain switching zone near the U-shaped notch and around the tip of the newly formed crack is discussed based on the electrical boundary condition (EBC) of the crack surfaces we proposed recently.

Digital image correlation technique Domain switching Electric field loading Fatigue crack growth Lead zirconate titanate

EI

英语

通讯

National Natural Science Foundation of China[11972262];

20222412220865

Correlation methods ; Crack closure ; Crack tips ; Deformation ; Fatigue crack propagation ; Fatigue of materials ; Image analysis ; Image segmentation ; Lead zirconate titanate ; Strain ; Strain measurement

Electricity: Basic Concepts and Phenomena:701.1 ; Ceramics:812.1 ; Mathematical Statistics:922.2 ; Mechanical Variables Measurements:943.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85131662198

Scopus

1.School of Civil Engineering and State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei,430072,China
2.School of Intelligent Construction,Wuchang University of Technology,Wuhan,Hubei,430223,China
3.Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices,Southern University of Science and Technology,Shenzhen,Guangdong,518055,China
4.School of Chemistry and Civil Engineering,Shaoguan University,Shaoguan,Guangdong,512005,China

Li，Yingwei,Chen，Zeji,Duan，Guan. Fatigue crack growth mechanism in ferroelectric ceramics under alternating electric field: An investigation by digital image correlation technique[J]. ACTA MATERIALIA,2022,235.

Li，Yingwei,Chen，Zeji,&Duan，Guan.(2022).Fatigue crack growth mechanism in ferroelectric ceramics under alternating electric field: An investigation by digital image correlation technique.ACTA MATERIALIA,235.

Li，Yingwei,et al."Fatigue crack growth mechanism in ferroelectric ceramics under alternating electric field: An investigation by digital image correlation technique".ACTA MATERIALIA 235(2022).