Investigations on the Micro-Scale Surface Interactions and Tribological Size Effect in MicroStamping of SS316L Sheet


Peker M. F., Gedikli H., Cora Ö. N., Koç M.

23rd World Hydrogen Energy Conference (WHEC 2022), İstanbul, Turkey, 26 - 30 June 2022, pp.1

  • Publication Type: Conference Paper / Summary Text
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.1
  • Karadeniz Technical University Affiliated: Yes

Abstract

Micro-stamping is a convenient sheet-metal forming technology providing small tolerances, surface accuracy, low-cost and fast production of thin metallic sheets. Compared to macro-forming operations, tribological changes in micro-forming processes are harshened. Tribological size effect should be considered for a better understanding of surface interaction on micro-scale. The objective of this study is to establish numerical and experimental models for micro-stamping of stainless steel blanks regarding the tribological size effect and determine the effects of feature size of the dies and stamping force onto friction, von-Mises stress, plastic strain, part thickness changes. Numerical models of micro-stamping process for the dies with 3 distinct channel sizes (250 µm, 750 µm and 2500 µm) were established in FEA package Ls-Dyna. Several coefficients of friction values were imposed and runs were performed. Micro-stamping were also conducted to verify the established FE models. It was noted that the dies with different channel sizes showed different magnitudes and distributions of von-Mises stress and plastic strain. In addition, different friction coefficients were encountered for the micro-stamping dies with 250 µm, 750 µm and 2500 µm channel sizes. The lower channel size the higher coefficient of friction was observed as a result of tribological size effect.