在疲劳试验机上试验所用的试样直径通常为6~10mm，而一般零件的尺寸与试样有很大的差别。 1）尺寸增大时，材料的疲劳极限降低。 2）强度高的合金钢比强度低的合金钢尺寸影响大。 3）应力分布不均匀性增大时，尺寸影响大。 为在设计中计入这种影响，引入尺寸系数ε。 其数值可在机械工程手册上查到，不必计算。
基于该优化设计并结合试验得到了适合正流群孔电解加工的分流均匀度系数和相应的尺寸系数。
Based on the optimization, experiments are conducted to obtain the uniformity ratio and the corresponding dimension ratio which suit the multiple hole drilling process.
综合考虑了接触线应力集中系数、尺寸系数、表面质量系数和材料疲劳强度的影响，得到了接触线疲劳极限的统计特征。
Statistical characteristic of fatigue strength of contact wires was obtained by comprehensively considering such coefficients as stress concentration, size and surface quality.
暗穴临界安全厚度随着暗穴断面尺寸、暗穴半径收敛值、安全系数、地面荷载等参数的增大而增大。
The critical safety thickness of hidden cavity increases with the augment of hidden cavity section size, radial constringency, safety coefficient and surface loading.
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