リブ補強に関する研究 : 第1報, 三角形リブすみ肉部の応力集中

The authors have studied on the stress concentration at the reentrant corner of triangular rib under pure bending by the two dimensional photoelastic method. Further experiment has been made on the triangular rib, the apex of which was cut off, and the change or the stress concentration (s.c.f.) at the reentrant corner aue to the amount or cutting the apex off has been examined. The results obtained are as follows : 1) The s.c.f. decreases with the increasing of the rib size, but no appreciable reduction of s.c.f. can be recognized when the rib size exceeds a cirtain value. 2) The value of s.c.f. and the rate of its increase become larger with the fillet radius. 3) When the apex of the triangular rib is cut off, the s.c.f. at the reentrant corner becomes smaller than the s.c.f. for the triangular rib and increases with the increase of the amount to be cut off.