基于次级声源指向性的微裂纹取向定征方法-陕西师范大学学报期刊社网站

陕西师范大学学报（自然科学版）

全国声学大会专题

基于次级声源指向性的微裂纹取向定征方法

王积硕，刘良兵，胡宁，邓明晰*

(重庆大学航空航天学院，重庆 400044)

王积硕,男, 博士研究生,主要研究方向为非线性超声无损检测。E-mail:359785780@qq.com;邓明晰, 教授, 博士生导师,研究方向为超声学。E-mail: dengmx65@yahoo.com.

摘要:

基于接触声非线性理论和双线性本构模型，构建了超声纵波与微裂纹相互作用的物理模型,发展了一种基于次级声源指向性的微裂纹取向定征方法。借助于ABAQUS仿真软件，通过添加VUMAT子程序对其进行了数值仿真，研究了不同取向的微裂纹与超声纵波之间的相互作用，分析了所产生的非线性谐波。结果表明，次级声源指向性随微裂纹取向的改变而敏感变化，可将其用于定征微裂纹的取向特性。

关键词：

微裂纹取向；接触声非线性；次级声源；指向性

收稿日期：

2019-09-30

中图分类号：

O422.7

文献标识码：

文章编号：

1672-4291(2019)06-0059-06

基金项目：

国家自然科学基金(11834008, 11632004)

Doi:

Characterization of micro-crack′s orientation using secondary acoustic source directivity induced by an incident ultrasonic longitudinal wave

WANG Jishuo, LIU Liangbing, HU Ning, DENG Mingxi*

(College of Aerospace Engineering, Chongqing University, Chongqing 400044, China)

Abstract:

A method is developed to characterize the orientation of the micro-crack based on the directivity of the secondary sound sources. Based on contact acoustic nonlinear ( CAN ) theory and the bilinear constitutive model, a physical model of the interaction between the ultrasonic longitudinal wave and a micro-crack is established and then the numerical simulation is carried out by adding the VUMAT subroutine, and the influence of the different orientations of the micro-crack on the nonlinear harmonic wave produced by the interaction between the micro-crack and the ultrasonic longitude wave is investigated. The simulation results show that the directivity of the secondary sound source is highly sensitive to the change of the micro-crack′s orientation. The method can be used to identify the micro-crack in any orientation.

KeyWords:

micro-crack orientation; ultrasonic nonlinear; secondary sound source; directivity