Apparent stress intensity factor KI with different radius are calculated by the stress method and KI is obtained by interpolation to the crack tip circular arc.
采用应力法计算不同半径处的表观应力强度因子，插值到裂尖圆弧而得。
In arc ignition process, it has apparent effect and improves the stability of arc, so that power factor is advanced and current drain is reduced.
在引弧过程中，有明显的效果，提高了电弧的稳定性，从而使功率因数是先进的，漏电流减少。
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