Crest of the Royal National Institution of Naval Architects - Click to return to the homepage



Marintec_New_July_December 2022


Palfinger August 2022

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



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


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.


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

Search and Order IJME papers

All International Journal of Maritime Engineering (IJME) papers are listed in the RINA Publications Database. You can search the database by author name and paper title. Publications may be ordered and paid for online. Other publications are also listed, some of which may be downloaded free of charge. Follow the link to Search Publications & Order.

RINA membership

Teinbridge Propeller

Euronaval Apr - Oct 2022

Herbert Engineering

Uni Stratchclyde June 2021

Metstrade May 2022