Finite Element Analysis of Machining Damage in Single-Grit Grinding of Ceramic Knee Implants

D. W. Sun, M. P. Sealy, Z. Y. Liu, C. H. Fu, Y. B. Guo, F. Z. Fang, B. Zhang

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations

Abstract

Alumina is a common biomaterial used for knee implants due to its excellent biomechanical properties. However, the complex geometry and required surface integrity make precision machining of knee implants very difficult. Machining mechanics and damage mechanism is not well understood. In order to better understand the mechanism of alumina grinding, this work presents a numerical simulation of single point grinding of alumina at a shallow depth-of-cut. A 3D finite element model of single-grit ceramic grinding has been developed using the pressure dependent Johnson-Holmquist constitutive model. Failure strain (FS) was adopted as a user-defined element removal criterion to reveal damage mechanism during the grinding process. The predicted machining groove topography correlated well with the experimental observations. Surface and subsurface microcracks were characterized at different FS. The thrust, frictional, and grinding force histories were also investigated. Furthermore, material behaviors at different locations below the machined groove were analyzed to shed light on subsurface microcrack initiation and propagation.

Original languageEnglish (US)
Pages (from-to)644-654
Number of pages11
JournalProcedia Manufacturing
Volume1
DOIs
StatePublished - 2015
Event43rd North American Manufacturing Research Conference, NAMRC 2015 - Charlotte, United States
Duration: Jun 8 2015Jun 12 2015

Keywords

  • Bioceramics
  • finite element analysis
  • grinding
  • machining damage
  • surface integrity

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Artificial Intelligence

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