Parametric modulation mechanism of surface acoustic wave on a partially closed crack

被引:25
作者
Kim, JY [1 ]
Yakovlev, VA [1 ]
Rokhlin, SI [1 ]
机构
[1] Ohio State Univ, Nondestruct Evaluat Program, Edison Joining Technol Ctr, Columbus, OH 43221 USA
关键词
D O I
10.1063/1.1572552
中图分类号
O59 [应用物理学];
学科分类号
摘要
Low-frequency parametric modulation of a pulsed surface acoustic wave by a partially closed fatigue crack is described. The crack is initiated in the plastic-yielding zone induced by a surface cavity and clamped due to the constraint of the surrounding elastic medium. Small periodic loading, superimposed on a static crack opening load, changes periodically the crack closure state and produces a nonlinear modulation of the reflected ultrasonic pulses. We describe quantitative experimental and modeling results relating the reflected modulation spectrum to crack length, closure, and modulation load. Surface acoustic wave measurements, which were performed in situ during a fatigue test, show that the modulation response varies significantly depending on the ratio of the fatigue crack length to the size of the plastic-yielding zone. (C) 2003 American Institute of Physics.
引用
收藏
页码:3203 / 3205
页数:3
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