Vibrodiagnostic parameters of fatigue damage in rectangular plates. Part 3. Through-the-thickness and surface semi-elliptical cracks
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- 作者：V. V. Matveev and O. E. Boginich
- 关键词：rectangular plate ; fatigue damage ; normal ; rupture crack ; vibrodiagnostic damage parameters ; natural frequency ; vibration decrement ; superharmonic resonance
- 刊名：Strength of Materials
- 出版时间：September, 2006
- 出版年：2006
- 期刊代码：65_00392316
- 类别：law
- 卷：38
- 期：5
- 页码：466-480
- 数据来源：sp
摘要
The paper addresses the analytical determination of vibrodiagnostic parameters that describe the presence of normal-rupture flat through-the-thickness and surface semi-elliptical central cracks in a rectangular homogeneous plate of constant thickness for various plate fixing conditions and vibration modes. It is shown that the most sensitive vibrodiagnostic damage parameter of a plate is the variation of the logarithmic decrement in the case of a through-the thickness crack and the second-harmonic ratio of the vibration process in superharmonic resonance in the case of a surface crack.