in the material.
This will cause additional stress concentrations in a highly
stressed area, which wassubject to special consideration at
the design stage. In this case the cracks seem to have started
from one of the lower shedder plate terminations and into the
deck plating, and it is likely that the cracks are caused by
dynamic stresses due to a combination of torsion of the hull
girder and longitudinal hull girder stresses, and the local
stress concentration factor due to the weld. Further propagation
of the cracks in the main deck may seriously affect the vessels
structural integrity if not dealt with in time.
-Courtesy
DNV Maritime Casualty Information