Abstract
The casting stresses of ordinally, innoculated and spheroidal cast irons were compared with using the same shape of specimens as θ, and it was found out that the casting stress increases in the order mentioned above.
And also, the relation between the ratios of ring, arm and boss in size and the casting stress of the specimen was investigated putting a boss in the center arm of the Θ shape specimen. It was found that the casting stress becomes almost neglible when V/S ratios of ring and boss are equal. (V : Volume, S : Surface area)
This is true without respect to the kind of material.
