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本文是珠光体和珠光体-铁素体球墨铸铁齿轮弯曲疲劳极限应力σ_(Flim)测定的试验总结。作者根据13对齿轮的寿命试验结果,用最小二乘法求得疲劳曲线方程为σ_F~(3.23726)N=2.941478×10~(11) 同时求得99％可靠度的疲劳曲线方程为: σ_F~(3.23726)N=8.6050375×10~(10) 据此,确定当循环基数N_0=5×10~6次时,其相应的弯曲疲劳极限应力为: 当可靠度为99％时σ_(Flim)=29.4公斤/毫米~2 σ_(Flim)=20.4公斤/毫米~2 上述数值可供设计齿轮时参考。
This paper is a summary of the experimental results of bending fatigue ultimate stress σ_ (Flim) measurement of pearlite and pearlite ferrite ductile iron gear. According to the life test results of 13 pairs of gears, the equation of fatigue curve obtained by the least square method is σ_F ~ (3.23726) N = 2.941478 × 10 ~ (11) The fatigue curve equation with 99% reliability is obtained as follows: σ_F ~ 3.23726) N = 8.6050375 × 10 ~ (10) Accordingly, it is confirmed that the corresponding bending fatigue ultimate stress when the cyclic basis N_0 = 5 × 10 ~ 6 times is: σ_ (Flim) = 29.4 when the reliability is 99% Kg / mm ~ 2 σ_ (Flim) = 20.4 kg / mm ~ 2 These values are for reference when designing gears.