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The Royal Institute of Naval Architects

Delner Brakes Oct 2018

US Coast Guard

IJME 265tn

Paper title: Change of Steel’s Yield Stress over Ship’s Service Life and its Effect on the First Yield Hull Girder Bending Moment

 

Authors

Lyuben D Ivanov, retired (formerly with American Bureau of Shipping ­ Houston, USA)

Summary 

The publication deals with the decrease of the yield and tensile stress of high tensile shipbuilding steel AH-32 over ship’s service life and its effect on the first yield bending moment as a representative of the hull girder capacity. An example is given for a sample 25K DWT (25 thousand tons deadweight) bulk carrier. The probability of failure is calculated as the probability of the total hull girder bending moment exceeding the first yield bending moment. The probabilistic distributions of yield and tensile stress are obtained from laboratory test of the specimen of AH-32 steel (corroded plates of a 20 year old ship). It is found that although the decrease of yield stress may not be great, the increase of the probability of failure (i.e., the probability that the total hull girder bending moment will exceed the first yield bending moment) could be substantial.

Reference

Transactions RINA, Vol 155, Part A3, International Journal Maritime Engineering, Jul-Sep 2013 

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