超声作用下SiC陶瓷表面振动强度分布模拟

The transient analysis and harmonic response analysis of SiC ceramics under ultrasonic action were performed using ANSYS finite element simulation software. The vibration intensity and vibration distribution of SiC ceramic surface under ultrasonic action were investaged by the laser vibrometer. The results show that the ultrasonic vibration of the SiC ceramic surface spreads around the ultrasonic tool head after the application of ultrasonic. The vibration intensity distribution of the SiC ceramic surface changes rapidly. The vibration first reaches the three boundaries closer to the ultrasonic tool head, and then reaches the farther boundary. With the increase of ultrasonic time, the vibration of SiC ceramics reaches a steady state of harmonic response. The vibration intensity of SiC ceramic surface increases with the increase of ultrasonic amplitude. When the ultrasonic amplitude is 4 μm, the amplitude of the ceramic surface vibration intensity can reach 18.6 μm in one period. When the ultrasonic amplitude is 8 μm, the vibration intensity amplitude is 36.6 μm. After the application of ultrasonic, the vibration intensity of the SiC ceramic surface is on the horizontal centerline, which gradually increases along the right edge of the ultrasonic tool head, and gradually increases along the horizontal centerline toward the two boundaries. Under the action of ultrasonic, the vibration at the center of the ultrasonic tool head on the ceramic surface is sinusoidal. In the direction away from the tool head, the vibration is no longer sinusoidal, but it also shows some characteristics of sinusoidal fluctuation. The vibration distribution characteristics and propagation law of SiC ceramic surface under the action of ultrasonic were analyzed. It can help to grasp the bonding method and mechanism of ultrasonic-assisted brazing of SiC ceramics, which makes the application of ultrasonic technology in SiC ceramic brazing possible.