%0 Journal Article
%T Sistema de baixo custo para nuclea  o de pr¨¦-trincas por fadiga em corpos de prova de tenacidade ¨¤ fratura
%A Guimar£¿es V.A.
%A Hein L.R.O.
%A Zangrandi Filho J.
%J Materials Research
%D 2001
%I ABM, ABC, ABPol, SBCC, SBCr, SBMM, SBPMat
%X Fracture toughness testing becomes a very important parameter for mechanical design and maintenance of parts and structures. This work presents the design and construction of a machine device to perform the pre-crack nucleation on SE(B) specimens for fracture toughness testing. Employing this device, it is possible to test materials for K Ic, CTOD and J Ic in a conventional tensile test equipment, assisted by a data acquisition system. The device is based on the concept of loading from an eccentric mechanism, controlling the displacement by means of a marking ring. The main contribution of this work is the low cost technology offered for laboratories, without high priced servo-hydraulic testing machines, giving them autonomy for the execution of fracture toughness tests. The experimental results satisfied the expectation about crack nucleation on SE(B) and applied loading control.
%K fracture toughness
%K fracture mechanic
%K mechanical testing
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392001000300011