Process mechanics in deep rolling of Magnesium-Calcium (MgCa) biomaterial

M. Salahshoor, Y. B. Guo

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Magnesium-Calcium (MgCa) alloys have received considerable attention recently in medical device manufacturing industry specially in making biodegradable bone implants. Deep rolling (DR) is as a promising manufacturing technique to adjust surface characteristics of implants with the ultimate goal of being able to adjust corrosion rates of MgCa implants. Contact mechanics between rolling ball and the workpiece is essential to understand the DR process. Contact mechanics is further complicated by the normal force reduction due to hydraulic pressure loss at the tip of DR tool, and the penetration depth reduction due to elastic recovery. The measured normal force, in this study, shows maximum 23% reduction compared to theoretical value. The normal force drop is not uniform and increases with increasing applied pressure. A 2D axisymmetric, semi-infinite FEM model is developed and validated to predict the amount of elastic recovery after deep rolling. The dynamic mechanical behavior of the material is simulated using the internal state variable (ISV) plasticity model and implemented in FEM code using a user material subroutine. The simulated dent geometry agrees with the measured ones in terms of profile and depth. Simulation results suggest 8% elastic recovery on average.

Original languageEnglish (US)
Title of host publicationASME 2011 International Manufacturing Science and Engineering Conference, MSEC 2011
Pages303-311
Number of pages9
DOIs
StatePublished - 2011
Externally publishedYes
EventASME 2011 International Manufacturing Science and Engineering Conference, MSEC 2011 - Corvallis, OR, United States
Duration: Jun 13 2011Jun 17 2011

Publication series

NameASME 2011 International Manufacturing Science and Engineering Conference, MSEC 2011
Volume1

Other

OtherASME 2011 International Manufacturing Science and Engineering Conference, MSEC 2011
Country/TerritoryUnited States
CityCorvallis, OR
Period6/13/116/17/11

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

Keywords

  • Contact mechanics
  • Deep rolling
  • FEA
  • Magnesium alloy
  • Orthopedic biomaterial

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