Experimental and numerical investigation of ultrasonically assisted micro-ring compression test

  • R. Shahrokh
  • A. Ghaei
  • M. Farzin
  • F. Ahmadi


In this study, ultrasonically assisted ring compression test was used to study the frictional behavior of contacting surfaces. Samples of above- and sub-millimeter sizes were prepared using stainless steel 316. Two commonly used lubricants in micro-forming, i.e., MoS2 and graphite powder, were used to lubricate the ring surfaces. The effects of ram speed, die material, ultrasonic vibration amplitude, and specimen size on the friction coefficient and deformation load were studied. In addition, the contribution of material softening and friction reduction on the deformation load decrease was identified using the test data and finite element simulation. The general trend of increase in friction coefficient with miniaturization was observed in ultrasonically assisted micro-ring compression test. However, the percentage of increase in friction coefficient due to miniaturization reduced when ultrasonic vibrations were applied. The results also showed that both friction reduction and material softening phenomena contribute to the decrease of the deformation load; however, the contribution of friction reduction was more than that of material softening.


Friction Metal forming Ultrasonic vibrations Micro-ring compression test 


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© Springer-Verlag London Ltd., part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIsfahan University of TechnologyIsfahanIran
  2. 2.Department of Manufacturing, Faculty of Mechanical EngineeringUniversity of KashanKashanIran

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