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采用率相关晶体塑性滑移理论模型,考虑镍基单晶的晶体取向和涡轮盘/片配合间隙的影响,针对涡轮叶片榫头/榫槽的复杂接触状况,研究了温度梯度载荷和离心载荷作用下三种取向的接触应力和低周疲劳损伤。结果表明:当榫头/榫槽的配合间隙小于3.7μm时,榫头/榫槽的接触应力随间隙值突变比较明显;而间隙值大于5.4μm时影响较小。接触应力和低周疲劳寿命对第一齿间隙值比较敏感,随间隙值的波动变化范围较大;第二齿的间隙对接触应力影响也较大,但对疲劳寿命的影响只在较小间隙值下较为明显。晶体取向对榫头/榫槽接触低周疲劳寿命有比较显著的影响,表现出明显的疲劳性能各向异性。
Considering the crystal orientation of the nickel-based single crystal and the influence of the gap between the turbine disk and the disk, the temperature-gradient loading and the centrifugal load were studied for the complicated contact condition of turbine blade tenon / mortise. Three orientation contact stress and low cycle fatigue damage. The results show that the contact stress of the tenon / mortise groove changes obviously with the gap when the fit clearance of the tenon / mortise is less than 3.7μm; The contact stress and low-cycle fatigue life are sensitive to the first tooth gap value, and vary greatly with the fluctuation of the gap value. The second tooth gap has greater influence on the contact stress, but the fatigue life is only affected by the smaller gap The value is more obvious. The crystal orientation has a significant influence on the low-cycle fatigue life of the tenon / mortise groove contact, showing obvious fatigue anisotropy.