Abstract
A submarine hull structure is repeatedly subjected to the stresses resulting from diving and manoeuvring, and is continuously exposed to the seawater environment. The work described in this paper characterizes a new steel, designated as BIS 812 EMA, for submarine hull applications, in terms of its corrosion fatigue behaviour. Smooth hourglass-shaped fatigue specimens and precracked compact tension specimens were subjected to cyclic loading at R = 0 to generate S−N data and crack growth rates in air and seawater, respectively. Laboratory results show that steel of type BIS 812 EMA is susceptible to seawater corrosion fatigue over a wide range of stress amplitudes applied using a low-frequency trapezoidal waveform. Fatigue crack growth rates are faster in seawater than in air. Emphasis was given to the fatigue crack growth rate characteristics. Using these characteristics along with some simplified assumptions about crack shape, structural geometry and stress level an estimation of the fatigue life was carried out.
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