A MODIFIED BOUNDARY ELEMENT METHOD FOR THE SCATTERING FIELD OF LAMB WAVE INTERACTIONS WITH A THINNING DEFECT
In this paper, a modified boundary element method (BEM) is proposed to solve the two-dimensional scattering fields of lamb waves in plates with a defect.For an infinite long plate, the infinite boundary integral in the traditional BEM is directly replaced by finite integral.Therefore, Spurious reflected waves are generated due to the truncated boundaries,which will cause calculation errors.In order to avoid these errors, the omitted integral terms in the traditional BEM are calculated by the reciprocity theorem in elastodynamics and the results are substituted into the traditional BEM.Meanwhile,this modified method is applicable to solving scattered fields for both single-layer and multi-layer models.At the end of this paper, the calculated results for single-layer and multi-layer plates with typical defects are shown, and the convergence of scattering coefficients is verified.Furthermore, the modified BEM, as an efficient numerical calculation method, can be used to study the forward problems of defect detection.
Lamb waves Scattering fields Modified boundary element method Defect detection
Kai HU Bin WANG Zheng-hua QIAN
State Key Laboratory of Mechanics and Control of Mechanical Structure/College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016
国际会议
哈尔滨
英文
171-174
2019-01-11（万方平台首次上网日期，不代表论文的发表时间）