Effect of microstructure on fatigue strength of bovine compact bones

Jong Heon Kim, Mitsuo Niinomi, Toshikazu Akahori, Junji Takeda, Hiroyuki Toda

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Despite its clinical importance in developing artificial bone, limited information is available regarding the microstructure with respect to the fatigue characteristics of bones. In this study, the fatigue characteristics of the bovine humerus and femur were investigated with respect to microstructures. Fatigue tests were conducted on the bovine humerus and femur at a stress ratio of 0.1 and a frequency of 10 Hz. The fatigue strength of the plexiform bone is slightly greater than that of the haversian bone. This is because the volume fraction of voids in the haversian bone, which is the site of stress concentration, is higher than that of voids in the plexiform bone. Several microcracks are observed on the fatigue fracture surface of the haversian bone. The microcracks are short and their propagation directions are random. However, the number of the microcracks in the plexiform bone is very small. The microcracks are relatively long and their propagation directions are parallel to the longitudinal direction of the lamellar bone. Therefore, the crack requires relatively more energy to propagate across the lamella in the plexiform bone.

Original languageEnglish
Pages (from-to)472-480
Number of pages9
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume48
Issue number4
DOIs
Publication statusPublished - 2006 Apr 15

Keywords

  • Compact bone
  • Fatigue strength
  • Microcrack
  • Microstructure
  • Osteon

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering

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