Fabrication and finite element simulation of sequential laser shock peening of biodegradable Mg-Ca implants

M. P. Sealy, Y. B. Guo, M. Salahshoor, R. Caslaru

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

Abstract

Current biocompatible metals such as steel and titanium alloys have excellent corrosive properties and superior strengths. However, their strengths are often too high and as a result have a negative effect on the body. Therefore, Magnesium (Mg) alloys with relatively low strengths are ideal biocompatible metallic materials. The problem with Mg implants is how to control corrosion rates so that the degradation of Mg implants may match with bone growth. The high compressive residual stress induced by laser shock peening (LSP) has a great potential to slow down the corrosion rate. LSP is a known surface treatment method to impart compressive residual stress in subsurface of a metal. Therefore, LSP was initiated in this study to investigate surface topography and integrity produced by peening a Mg alloy. A 3D semi-infinite simulation has also been developed to predict the topography and residual stress fields produced by sequential peening. The dynamic mechanical behavior was modeled using a user material subroutine of the internal state variable plasticity model. The temporal and spatial peening pressure was modeled using a user load subroutine. The simulated dent agrees with the measured dent topography in terms of profile and depth. Sequential peening was found to increase the tensile pile up region which is critical to tribological applications. The predicted residual stress profiles are also presented.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
Pages1-8
Number of pages8
DOIs
StatePublished - 2009
EventASME International Manufacturing Science and Engineering Conference 2009, MSEC2009 - West Lafayette, IN, United States
Duration: Oct 4 2009Oct 7 2009

Publication series

NameProceedings of the ASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
Volume1

Conference

ConferenceASME International Manufacturing Science and Engineering Conference 2009, MSEC2009
CountryUnited States
CityWest Lafayette, IN
Period10/4/0910/7/09

Keywords

  • Corrosion
  • Finite element simulation
  • Implants
  • Laser shock peening
  • Metallic biomaterial
  • Surface integrity

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Mechanical Engineering

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