Feasibility of nondestructive testing using transient vibrations excited by acoustic radiation force

Abstract

The use of the transient response in vibro-acoustography to image the mechanical properties of objects was investigated. Verification of the proposed method using aluminum foil showed that transient vibrations are generated by a step-function acoustic radiation force exerted on an object. These vibrations can be used to obtain the frequency characteristics of the object. The proposed method was applied to the one-dimensional imaging of aluminum foil with various mechanical properties. This method captured the distributions of the vibrational amplitude and mode frequencies, which vary according to local mechanical properties. These results show that the proposed method effectively visualizes the mechanical properties of objects.

Ultrasonic complex vibration source equipped with a step horn with a welding tip and its welding characteristics

“…Ultrasonic vibration is widely used for non-contact and nondestructive inspection and measurement [1][2][3][4][5][6][7][8][9] and for applications including ultrasonic welding and ultrasonic processing. [10][11][12] Ultrasonic welding does not require the application of external heat to the objects for welding; thus, this method is suitable for welding dissimilar metals that cannot be welded by hot welding methods due to their different melting points.…”

Visualization of slit defect by scanning nonlinear airborne ultrasound source technique using compressed sensing

“…Non-destructive testing 1) is used to maintain the safety of large structures, such as chemical plants, power plants and tunnels, and the testing must not interfere with the operation of the structure. Various methods 2,3) have been developed that can quickly and accurately test the condition of structures. Ultrasound testing [4][5][6] is widely used because of its safety and convenience.…”