@article{oai:ir.kagoshima-u.ac.jp:00007761,
 author = {若原, 稔 and WAKAHARA, Minoru and 末永, 勝郎 and SUENAGA, Katsuro and 永江, 次夫 and NAGAE, Tsugio},
 journal = {鹿児島大学工学部研究報告, The research reports of the Faculty of Engineering, Kagoshima University},
 month = {Dec},
 note = {It has been recognizd that a series of closely spaced notches represnts lower degree of stress concentration than that of a single notch.
As the first step, to obtain information for the fatigue strength in such a case, we studied
following experiments ;
(1) The stress concentration factor of flat bar specimene of Epoxy Resin with one or tow 60°-V
notches of identical shape on both edges subjected to pure bending, was measured by the photo elastic
method varying the root radius of notches.
(2) We measured the fatigue strength of shaft of the carbon steel for machine structural use,
S35C, with one or two 60°-V groove notches subjected to rotary bending.
The results obtained are summarized as follows ;
(1) The experimental values of stress concentration factor for a single notch are almost coincident
with Neuber's theoritical ones.
(2) In computing the stress concentration factor, we suggest to use the effective notch depth at
the end notches instead of actual notch depth, and obtained good results.
(3) The root radius of notch at the branch point, ρ_0 is nearly 0.4~0.5mm for the tow notch
specimens as single ones.
(4) The fatigue crack initiated at a point of maximum stress, slightly out of the notch bottom.},
 pages = {37--44},
 title = {二連切欠き材の疲れについて : 応力集中係数および疲れ限度},
 volume = {18},
 year = {1976}
}