Abstract
To investigate the relation between the notch strength of a rod and that of the corresponding plate mild steel specimens, fatigue and tensile experiments are carried out. The results are summarized as follows. (1) The notch strength of a rod is greater than that of a plate for the same profile. (2) An experimental relation between fatigue notch factors of a rod and those of a plate is given. (3) Static notch strength doesn't depend on the notch root radius ρ, and local yielding is induced at earlier stage before the apparent yielding. When the yielded zone connects the opposite notchs, the stress is comparable with the lower yield point and doesn't depend on the notch shape. The notch factor of a rod estimated from that of a plate is greater than the measured one. (4) Relation between fatigue strength and static strength varies with ρ. (5) A notch constrains the deformation.
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