Efeito da direção e da espessura na taxa de propagação de trinca por fadiga de alto ciclo nos aços da classe API 5L-X70 e ASTM A516-GR65.

Abstract

In This work the effect of thickness and crack orientation ("TL" and "SL") on fatigue behaviour of steels class API 5L-X70 and ASTM A516-GR65 was investigated. The tests were conducted at ambient temperature and compact tension tests specimens was used. Fatigue crack propagation was attended with a travell microscope. When the crack propagate in the longitudinal direction in a parallel plane to lamination plane of the plate ("SL"), the test specimen thickness tend to effect the fatigue crack propagation. Fatigue behaviour of the steels was confronted and the differences discussed.