光学精密工程2011，Vol.19Issue(1)：132-137,6.DOI:10.3788/OPE.20111901.0132
微纳米级裂纹的非线性超声检测
Nonlinear ultrasonic test of micro-nano crack
摘要
Abstract
A self-built nonlinear ultrasonic test system was established and the interaction between ultrasonic waves and cracks in metal materials and the distortion effects of ultrasonic waves were researched to implement the ultrasonic test of micro-nano cracks in metal materials. On the basis of the presumption that nonlinearity of ultrasonic waves in solid materials is universal, the distortion effect caused by the interaction between ultrasonic waves and the micro-nano cracks in metal materials was explored. Then, according to the analysis on the distortiot effect, the measurement of ultrasonic high-order harmonic amplitude was illustrated. Finally,a regular ultrasonic test and a nonlinear ultrasonic test were conducted respectively on fatigue cracks in metal materials, which proves that the nonlinear ultrasonic testis more effective for the micro-nano crack detection. Experiments show that the length of a fatigue crack is relative closely to the exciting efficiency of the second harmonics and the length of the crack detected by the nonlinear ultrasonic method based on the second harmonics is 30％ longer than that by the regular ultrasonic test, which realizes the test for micro-nano cracks in metal materials.关键词
非线性超声检测/无损检测/二次谐波/微纳裂纹Key words
nonlinear ultrasonic detection/ non-contack detection/ second harmonic/ micro-nanocracks分类
通用工业技术引用本文复制引用
敦怡,师小红,王广龙,周兆英..微纳米级裂纹的非线性超声检测[J].光学精密工程,2011,19(1):132-137,6.基金项目
国家自然科学基金资助项目(No.50805145) （No.50805145）
