Cyclic fatigue of a sintered Al2O3/ZrO2ceramic

✍ Scribed by Kai Duan; Yiu Wing Mai; B. Cotterell

• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 826 KB
• Volume: 30
• Category: Article
• ISSN: 0022-2461
• DOI: 10.1007/bf00356069

✦ Synopsis

A systematic experimental and theoretical study on the crack growth behaviour of a sintered AI2Oa/ZrO2 ceramic under cyclic loading is presented. It is found that in the cyclic fatigue experiments conducted on the single-edge-notched beam (SENB) geometry, for similar testing conditions, the crack growth rates are significantly faster than those under static fatigue. AI203/Zr02 therefore suffers genuine mechanical fatigue. Further experiments with the compact tension (CT) geometry show that the mechanical fatigue effect arises mainly from the degradation of the bridging mechanism. A theoretical analysis based on the compliance technique and a power law relationship between the crack-wake bridging stress and the crack-face separation is developed to evaluate quantitatively the degradation of the bridging stress due to cyclic fatigue.