US 12,379,348 B2
Air-coupled ultrasonic plane stress detection method for composite material based on dual-modal sound-time ratios of lamb wave
Bingquan Wang, Harbin (CN); Jiubin Tan, Harbin (CN); Bo Zhao, Harbin (CN); and Weijia Shi, Harbin (CN)
Assigned to Harbin Institute of Technology, Harbin (CN)
Filed by Harbin Institute of Technology, Harbin (CN)
Filed on Mar. 1, 2023, as Appl. No. 18/115,790.
Claims priority of application No. 202211246109.4 (CN), filed on Oct. 12, 2022.
Prior Publication US 2024/0133844 A1, Apr. 25, 2024
Int. Cl. G01N 29/04 (2006.01); G01L 1/25 (2006.01); G01N 29/07 (2006.01)
CPC G01N 29/041 (2013.01) [G01L 1/255 (2013.01); G01N 29/07 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An air-coupled ultrasonic plane stress detection method for a composite material based on dual-modal sound-time ratios of a Lamb wave, comprising the following steps:
S1: configuring a detection device to emit a signal to a detection point of the composite material in the form of the Lamb wave;
S2: receiving a reflected signal by the detection device; measuring unidirectionally loaded stress; based on the reflected signal and the dual-modal sound-time ratios of the Lamb wave in S1, and using unidirectionally loaded stress to obtain different stress coefficient relations;
S3: based on the stress coefficient relations in S2, solving stress coefficients;
S4: based on the stress coefficients in S3, acquiring three sound-time ratios;
S5: based on the three sound-time ratios in S4, describing a stress state of the detection point; and
S6: repeating S4 and S5 till completing detection and scanning of all points.