The application of ultrasonics in metal forming applications has been shown to reduce the forming load significantly in many research studies. The load reduction has been related to the stress superposition effect, rise in temperature and change in the friction condition between the specimen and die interfaces. This paper reports an investigation into the effects of superimposed ultrasonic oscillation of the die in compression tests on aluminium specimens. In particular, a finite element model is developed to simulate uniaxial compression and to model the effects of a change in the friction boundary condition when ultrasonic excitation is applied to the lower platen. The model predictions of the stress-strain relationship can be compared with test data to provide some insights into the effects of the interfacial condition. The paper shows how the analysis of the test data, combined with finite element models of ultrasonic compression test simulations, allows some initial conclusions to be drawn regarding the influence of the interfacial friction during ultrasonic compression.
[1]
Ivan Kristoffy,et al.
Metal Forming With Vibrated Tools
,
1969
.
[2]
A. Rozner.
Effect of Ultrasonic Vibration on Coefficient of Friction during Strip Drawing
,
1971
.
[3]
Margaret Lucas,et al.
Influence of ultrasonics on upsetting of a model paste.
,
2002,
Ultrasonics.
[4]
Jung-Chung Hung,et al.
The influence of ultrasonic-vibration on hot upsetting of aluminum alloy.
,
2005,
Ultrasonics.
[5]
F. B. Prinz,et al.
Plastic Deformation Under Simultaneous Cyclic and Unidirectional Loading at Low and Ultrasonic Frequencies
,
1985
.
[6]
O. Izumi,et al.
Effects of Superimposed Ultrasonic Vibration on Compressive Deformation of Metals
,
1966
.
[7]
D. H. Sansome,et al.
Review of the application of ultrasonic vibrations to deforming metals
,
1975
.
[8]
Margaret Lucas,et al.
Ultrasonic Compression Tests on Aluminium
,
2005
.