Table of Contents Author Guidelines Submit a Manuscript
Advances in Materials Science and Engineering
Volume 2014, Article ID 274502, 6 pages
http://dx.doi.org/10.1155/2014/274502
Research Article

A Method to Determine Energy and Power of a Fracture Process in Polycrystals by Means of HVTEM

1Instituto Politécnico Nacional, Escuela Superior de Ingeniería Mecánica y Eléctrica, Sección de Estudios de Posgrado e Investigación, Laboratorio de Fuerza Atómica Avenida de las Granjas No. 682, 02250 Azcapotzalco, DF, Mexico
2Institute of Metallurgy BAIKOV, Russian Academy of Science, Lenninsky Prozpekt No. 49, Moscow, Russia

Received 1 October 2013; Revised 23 December 2013; Accepted 30 December 2013; Published 17 February 2014

Academic Editor: Rui Zhang

Copyright © 2014 Pedro Alejandro Tamayo-Meza et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Main crack propagation process in polycrystalline materials is very complex due to intercrystalline sliding mechanism effects. Multiple factors make it considerably difficult to analyze the state of stresses in the crack tip within the theoretical scope of linear fracture mechanics (LFM). As a basis for the suggested Bilby-Cottrell-Swinden model, we propose a method to determine the state of stresses in the tip of a propagating crack in microspecimens subjected to tension and measured inside a high voltage transmission electron microscope (HVTEM). Based on the electron microscopy observations of a main crack and the formation of microcracks in the plastic zone, the J-integral was determined.