在不同应力比(R)条件下研究珠光体片层距(d)对疲劳裂纹近门槛区扩展的影响,测定了材料闭合应力强度因子(K_(cl))和门槛值(ΔK_(th))以及在门槛区扩展时裂纹尖端张开位移范围(ΔCOD)。
The effect of pearlite interlamellar spacing of steel T_8 on fatigue crackpropagation near threshold has been investigated at different stress ratios. The clo-sure intensity factor, threshold value and crack tip opening displacement range weremeasured.
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