A numerical study of co-linear mixing of two longitudinal waves
SUN Zhenghao1,3, LI Hongguang2, LI Fucai2, MENG Guang2,3， SUN Hui1
1.Shanghai Institute of Spacecraft Equipment, Shanghai 200240, China;
2.Shanghai Jiao Tong University, State Key Laboratory of Mechanical System and Vibration, Shanghai 200240, China;
3.Shanghai Academy of Spaceflight Technology, Shanghai 201109, China
Abstract：It is an urgent problem to identify and evaluate early weak fatigue damage of large complex equipment, and nonlinear ultrasonic nondestructive testing techniques based on the higher-order elastic modulus have aroused much attention in recent years because of their sensitivities to micro structural changes.Using a high-resolution semi-discrete central scheme, the ultrasonic wave mixing, a novel nonlinear ultrasonic nondestructive testing technique, was numerically investigated in the case of collinear wave mixing of two longitudinal waves in the same direction.The results of the generated components of resonant waves show that, both components of sum and different frequencies can be produced and propagate in two mutually perpendicular directions, and the component of different frequency brought about in the shear direction increases monotonically with material nonlinearity, which potentially offers an accurate measurement of material nonlinearity, and further provides effective methods and evidence for early weak damage of materials using the ultrasonic wave mixing technique.
孙征昊1,3，李鸿光2，李富才2，孟光2，3，孙晖1. 两列同向共线纵波混叠的数值研究[J]. 振动与冲击, 2021, 40(12): 219-226.
SUN Zhenghao1,3, LI Hongguang2, LI Fucai2, MENG Guang2,3， SUN Hui1. A numerical study of co-linear mixing of two longitudinal waves. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(12): 219-226.
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