Deck OpeningとStressとの關係を試驗片によりて試驗せし實驗

抄録

About 40 test pieces were prepared for this purpose. These test pieces consisted of various kinds, i.e., some with one opening in single plate, some made thicker on both sides of the opening, some with coaming to the opening and side coamings corresponding to shell plate of ship, some having two openings consecutively, some with rounded corners, and others with straight coner doublings or with doublings round the corners etc. These test pieces were pulled by a testing machine along the centre line or with some inclination to the centre line, or obliquely shifting the grips of the mochine to a different plane, or combined. The results were recorded with regard to the elastic limit, the maximum and after broken. The fracture occured in some at corners and in the others between corners, and no distinct relation was to be found between the points of fracture and the direction of pull, but the lines of fracture appeared withoute xception at right angle to the longer edge of the test piece. When the fracture occured at corner, it was at the end of the round or the doubling, with one exception which occurred across the doubling (that doubling being very thin, i.e., one-quarter of deck plate). With respect to the deformation of the opening, the breadth was not changed or changed very slightly within the elastic limit, but the length became visibly longer. The strength of the test piece per square inch section became approximately 3% greater than that of the standard test piece of the same plate.