TITLE:
Simulation Studies of Nodular Iron’s Bull’s Eye Effect on Stress Concentration under Plane Stress Conditons
AUTHORS:
O.O. Oluwole, O.E. Olorunniwo
KEYWORDS:
Simulation, Ductile iron, Bull’s eye, Stress concentration, Plane stress
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.6 No.2,
October
20,
2007
ABSTRACT: A simulation study on the effect of the “bull’s eye” in ductile iron on stress
concentrations was done in this work. Using the model of graphite nodules in a cavity, a
two dimensional plate strip was subjected to plane stress conditions. The results were
compared to the traditional theory of modeling the graphite as holes (cavity) in the iron
matrix. In plane stress conditions, while the graphite in the hole model showed the hole
as areas of stress concentration and therefore very critical as regards fracture, the hole
model showed stress concentrated away from the holes making the holes not very
critical factor as regards fracture. It was observed that areas of stress application were
more critical than the voids when using the hole model. Also the graphite in the hole
model was able to predict the good damping behaviour of ductile iron and the increasing
elongation with decreasing nodule count.