Crescimento de trincas em fadiga torsional / Fatigue crack growth in torsional fatigue

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

19/07/2011

RESUMO

With increasing competition and reliability in modern equipment, is of vital importance to studies on the structural fatigue life in the time domain and frequency domain, the advance speed and cost reduction in computing greatly simplifies the prediction fatigue life. But it is also necessary to know the modes of fatigue crack growth, and its mechanisms. After a review appropriate to implement a program to estimate the loss of torsional stiffness in a specimen with a crack in Mode II, was developed a device torsional fatigue tests in an attempt to identify the onset of macroscopic crack and study its growth. With learning the operation of the drive system, the system data acquisition device testing, and design and construction of an electronic circuit to shutdown device tests at the beginning of the crack in the specimen, an adequate control and calibration of these components was performed, generating confidence in that joint. This document is the experimentally determined curve of fatigue specimens of SAE 1020 Steel, Grey Cast Iron and Aluminum 6063. They also studied the failure modes of cracks from the beginning until the final rupture of the specimen to verify the failure modes, the crack initiation and propagation of macroscopic materials. It still made a numerical prediction by finite element method the size of the crack.

ASSUNTO(S)

fadiga torção crescimento de trinca modos de falha engenharia de materiais e metalurgica fatigue twist crack growth failure modes

ACESSO AO ARTIGO

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