Accession Number : ADA587643


Title :   Acoustic Emission Based Surveillance System for Prediction of Stress Fractures


Descriptive Note : Final rept. 1 Sep 2003-31 Aug 2007


Corporate Author : PURDUE UNIV LAFAYETTE IN


Personal Author(s) : Akkus, Ozan


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a587643.pdf


Report Date : Sep 2007


Pagination or Media Count : 18


Abstract : The overall hypothesis driving this work was that an increase in microdamage activity during repeated loading of bone will signal the approaching fatigue fracture. The formation and propagation of microdamage, in the form of microcracks and diffuse damage, produces detectable acoustic emission events similar to the seismic motions of an earthquake. Therefore, impending fatigue fracture of bone can be detected by acoustic emissions. In order to test this hypothesis, fresh-frozen human tibias from males and females between the ages of 20 and 50 years old were acquired for use in testing procedure outlined below. Sections of the tibias were removed and machined into a proper geometry for fatigue tests. Microdamage formation with characteristic waveform properties was monitored through the use of piezoelectric acoustic emission transducers. The primary aim of this work was to investigate and quantify the damage events during the in vitro fatigue loading of cortical bone fatigue fracture model.


Descriptors :   *BONE FRACTURES , *STRESS(PHYSIOLOGY) , DAMAGE , DIFFUSION , HYPOTHESES , IN VITRO ANALYSIS , MEDICAL RESEARCH , MODELS , MOTION , PREDICTIONS , PROPAGATION , SIGNALS , TEST AND EVALUATION


Subject Categories : Medicine and Medical Research


Distribution Statement : APPROVED FOR PUBLIC RELEASE