SURFACE-BREAKING FATIGUE CRACK DETECTION USING LASER ULTRASOUND

被引：91

作者：

SHAN, Q

DEWHURST, RJ

机构：

[1] DIAS, UMIST, Manchester, M60 1QD

来源：

APPLIED PHYSICS LETTERS | 1993年 / 62卷 / 21期

关键词：

D O I：

10.1063/1.109274

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Surface-breaking tight fatigue cracks in mild steel have been examined with laser-generated ultrasonic pulses. Before the arrival of transmitted Rayleigh waves arriving at the detector, evidence is presented of a fast skimming longitudinal pulse which is also transmitted through the crack. Additionally, another ultrasonic feature is consistent with a longitudinal wave which is mode converted to a diffracted shear pulse by the tip of the fatigue crack. Such an interaction mechanism can form the basis of laser-based fatigue crack depth measurements.

引用

页码：2649 / 2651

页数：3

共 13 条

[1]

BAMFORD WH, 1981, ASTM STP, V738, P281

[2] SURFACE ACOUSTIC-WAVE INTERACTIONS WITH CRACKS AND SLOTS - A NONCONTACTING STUDY USING LASERS [J].