摘要
The fatigue notch factors (K_f) of metallic materials with high and low notch sensitivities, which have been derived in theory, are K_t^1/(1+n) and K_t^2/(3+n) respectively. The diagram of K_f vs. K_t is obtained by means of comprehensive analysis of alarge number of data, and the applicable range of the above two K_c relations is given. The calculation results for steel and aluminum alloy agree with the measured values very well. The fatigue limit of smooth specimens are also derived in this paper, i. e. σ_(theory)=(K/E^n)~1/(1+n). The calculation results are σ_(theory)=σ_(cy) (cyclic yield strength).
The fatigue notch factors （K<sub>f</sub>） of metallic materials with high and low notch sensitivities, which have been derived in theory, are K<sub>t</sub><sup>1</sup>/（1+n） and K<sub>t</sub><sup>2</sup>/（3+n） respectively. The diagram of K<sub>f</sub> vs. K<sub>t</sub> is obtained by means of comprehensive analysis of alarge number of data, and the applicable range of the above two K<sub>c</sub> relations is given. The calculation results for steel and aluminum alloy agree with the measured values very well.The fatigue limit of smooth specimens are also derived in this paper, i. e. σ<sub>theory</sub>=（K/E<sup>n</sup>）<sup>1</sup>/（1+n）. The calculation results are σ<sub>theory</sub>=σ<sub>cy</sub> （cyclic yield strength）.
