Fatigue behavior of Al2O3-based composite with BaTiO3 piezoelectric phase

✍ Scribed by Sirirat Rattanachan; Yukio Miyashita; Yoshiharu Mutoh

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 562 KB
• Volume: 28
• Category: Article
• ISSN: 0142-1123
• DOI: 10.1016/j.ijfatigue.2006.02.022

✦ Synopsis

Fatigue behavior of Al 2 O 3 -based composite with BaTiO 3 piezoelectric phase was studied by carrying out four-point bending fatigue tests for the poled and unpoled composites, which was compared to that of monolithic Al 2 O 3 . Tests were conducted under load ratio of R = 0.1 at frequency of 20 Hz with sinusoidal waveform. The present composites exhibited high fatigue resistance compared to monolithic Al 2 O 3 . From the detailed observations, it was found that the improvement of fatigue strength was mainly due to stress-induced domain switching. The relationship between da/dN and K max was evaluated by conducting fatigue crack growth tests. The threshold stress intensity factors for unpoled and poled composites were higher than that of monolithic Al 2 O 3 .