Experimental investigation of vibrational mode shape influence on compression behaviour of Ti-6Al-4V alloy under superimposed ultrasonic vibration

Authors

1 Amirkabir University of technology

2 Industrial Design Department. Art Faculty. Alzahra University

3 Amirkabir university of technology

4 Mechanical Engineering / Iran University of Science and Technology

Abstract

Superimposing high power ultrasonic vibration on metal forming processes changes the mechanical behavior of the material and reduces its flow stress. These phenomena improve the ductility of material and reduce forming forces. To investigate the influence of ultrasonic vibration on various materials, standard compression and tensile tests under ultrasonic vibration could be performed. This research investigates the compression behavior of Ti-6Al-4V alloy under superimposed ultrasonic vibration. For this purpose, a special set-up was designed, fabricated and tested. Ultrasonic vibration is transmitted from the ultrasonic transducer to the booster and then guided by horn (punch) to apply to test sample. Horn geometry, vibrational mode shape and ultrasonic power were selected as input variables. The effect of specimen position in system vibrational mode shape was studied by using different ultrasonic transmitters, which allowed the specimen to place at node and anti-node positions. It is found that ultrasonic vibrations reduced the formability of this alloy. Acoustic hardening phenomena do not observe in this material. Also, flow stress of the material reduced under ultrasonic vibration up to 17.63% which has direct relation to ultrasonic power. In addition, the most efficiency was observed when the specimen placed in the node position.

Keywords

Main Subjects

References

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Journal of Solid and Fluid Mechanics
Volume 12, Issue 4
September and October 2022
Pages 55-68

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