Abstract
The coupled deformation of composite structures of discrete media filled thin-walled tubes under the action of forces is a complicate mechanical process, especially when it is superimposed with external vibration. A Jenike shear cell connected with an ultrasonic exciting system was used to test the friction angles of the aggregations of ferric powder and steel ball under quasi-static and high frequency vibration conditions; then forward extrusion of Al6061 tubes filled with these discrete materials under different conditions were examined by experiment and numerical simulation. The results showed that the friction angles of both the discrete materials decreased under vibration, and those of the powders were reduced more, indicating that the “surface effect” of vibration on the particles with smaller granularity is more obvious. Under the combining action of “volume” and “surface” effects of vibration, the extrusion loads of the structures significantly decrease with the superposition of vibration, meanwhile the loads of the tubes filled with powders reduced more. With the imposed vibration, the density of fillers after forming are higher and the tube wall thickness distribution is more uniform.
Highlights
Since the pioneering work of Blaha and Langenecker [1, 2] for superimposing mechanical vibration on the monocrystal zinc during tensile tests, a great number of studies had been conducted to reveal the effect of vibration on the plastic deformation of metals [3,4,5,6]
It can be seen that the friction angles of both the discrete materials are reduced under vibration; the friction angle of the ferric powders decreases more than that of the steel balls under the action of ultrasonic agitation
This paper studied the forward extrusion of discrete media filled Al6061 tubes under the states of quasi-static and ultrasonic vibration
Summary
Since the pioneering work of Blaha and Langenecker [1, 2] for superimposing mechanical vibration on the monocrystal zinc during tensile tests, a great number of studies had been conducted to reveal the effect of vibration on the plastic deformation of metals [3,4,5,6]. The composite structure of discrete media filled hollow profiles is frequently encountered in industrial environment, for instance, the PIT (powder in tube) methods for production of superconducting wires [14, 15], the solid granule medium forming [16], and others [17,18,19,20,21]. Integral deformation of these types of structures is a complicated mechanical process, coupled with elastic-plastic deformation of mother tube, flow of inner media, and the interactions between filler and tube wall as well. Deformation characteristics, densification and uniformity of the fillers after forming were examined
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
