In this paper we propose a methodology for a fast numerical determination of low cycle fatigue lifetime of superelastic shape memory alloy structures. This method is based on the observation that generally, in low cycle fatigue, shape memory alloy (SMA) structures are subject to loadings that lead to a confined non-linear behaviour at stress concentration points, such as notches. Numerical fatigue lifetime prediction requires the computation of the mechanical state at critical points.
View Article and Find Full Text PDFOral Surg Oral Med Oral Pathol Oral Radiol Endod
January 2011
Objectives: The objectives of this study were to compare numerically the bending and torsional mechanical behavior of 5 endodontic rotary Ni-Ti instruments with equivalent size and various designs for tapers, pitch, and cutting blades.First, the geometries of Hero (20/0.06), HeroShaper (20/0.
View Article and Find Full Text PDFOral Surg Oral Med Oral Pathol Oral Radiol Endod
March 2010
Objectives: The aim of this study was to develop a numeric method to study the mechanical behavior of an endodontic instrument during different loading paths and to demonstrate the importance of the behavior model in the finite element results.
Study Design: A numeric study of an endodontic instrument was carried out. At first, the geometry was meshed with a finite element code.