Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
THERMOMECHANICAL FATIGUE LIFE OF GRAY AND COMPACTED GRAPHITE CAST IRON ALLOYS
Submission Author:
Douglas Bon , SP
Co-Authors:
Douglas Bon, Waldek Wladimir Bose Filho, Wilson Luiz Guesser
Presenter: Douglas Bon
doi://10.26678/ABCM.COBEM2019.COB2019-1431
Abstract
The automotive industry has been committed to meet the growing demands of sustainability required by the competitive market and by society concerned to combustion engines energy efficiency as well as a low rate of degradation of their components, this is the objective to be achieved by manufacturers. The ever-growing power density and consequently higher-pressure peaks and temperatures, has demanded cylinder heads and engine blocks with improved mechanical resistance and ductility. The thermo-mechanical fatigue life of cylinder head has been one of the limiting factors in heavy duty engine design. Therefore, this work compares the thermomechanical fatigue strength of two cast iron types used for cylinder head fabrication, named as gray cast iron grade 300 (GI300) and compacted graphite cast iron grade 500 (CGI 500). Therefore, out of phase thermomechanical fatigue tests were carried out in temperature range of 50-420ºC, considering a trapezoidal wave shape and complete mechanical constraint. The results show that. CGI can withstand the presence of a higher number of cracks than GI, before the final fracture.
Keywords
gray cast iron, compacted graphite iron, thermomechanical fatigue, cycle thermal, cylinder heads.
