Some factors influencing the low cycle fatigue behaviour of pre-cracked, high strength structural steels in sea water

Abstract

It is recognised that large, welded, unstress-relieved structures, constructed for a number of marine applications, contain crackso Their service lives will be determined by the time taken for the cracks to grow to some critical size, rather than by the level of fracture toughness per se. These structures are known to contain residual tensile stresses of up to yield strength in magnitude, and are likely to fail as a result of low cycle corrosion fatigue, when operating conditions involve the application of high levels of cyclic stresso Few data exist concerning the low cycle fatigue behaviour of pre-cracked high strength structural steels in marine environments, under constant load conditionso In order to carry out meaningful tests it is necessary to employ low testing frequencies which reflect the sensitivity of the material to the conjoint effects of fatigue and corrosiono This creates a requirement for a large number of testing machines. The need was met by the design and construction of multi-specimen machines based on a novel principle which involved the removal of the load by flotation in water. Low cycle fatigue testing was carried out in air and sea water environ ments using pre-cracked SEN specimens, with specially modified side grooves which had been developed to control the ratio of plane-strain to plane stress in order to simulate full plate thickness, by compensating for

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