Investigation of Interfacial Friction and Inverse Flowing Behavior under the Adhesive State

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  • Ma Qingxian
    Department of Mechanical Engineering, Tsinghua University
  • Li Weiqi
    Department of Mechanical Engineering, Tsinghua University

書誌事項

公開日
2016
DOI
  • 10.2320/matertrans.m2015434
公開者
公益社団法人 日本金属学会

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説明

For improving the precision of numerical simulations in metal forming, it is critical to accurately evaluate the interfacial friction between die/specimen and material deformed behavior. However, there is a huge challenge to assess interfacial friction and material deformed behavior due to the complex mechanisms of tribology at the interfaces. In this study, a program of experimental work directed by ring upsetting has been carried out to evaluate interfacial friction and material deformed behavior on account of the specific adhesive friction state. The behavior of adhesive friction was qualitatively identified with characterized phenomenon and quantitatively identified with friction coefficient, which was obtained by taking advantage of Boltzmann distribution characteristics between the radial velocity field and the relative displacements relevant to metal particles on the meridian plane. Furthermore, simple mathematics methods were applied to analyze inverse flowing behavior under the condition of adhesive friction based on the transients displacement achieved by ring upsetting. And the driven mechanism of inverse flowing behavior was also revealed systematically. Finally, a new theory of bi-directionality theory was proposed to illustrate inverse flowing behavior, and the sustainability of adhesive friction was synthetically analyzed.

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