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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Effects of frequency on hysteretic heating and fatigue life of unreinforced injection molded polyamide 66 spur gears
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Effects of frequency on hysteretic heating and fatigue life of unreinforced injection molded polyamide 66 spur gears

机译：频率对未粘接注射成型聚酰胺66型旋转齿轮滞回和疲劳寿命的影响

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摘要

Gears are subjected to different rotational speeds/frequencies during their service life. The effect of the rotational speed on the performance of a metal gear is insignificant; however, it affects the thickness of the lubricant film. Polymer gears generate hysteretic self-heating because of the viscoelastic behavior of the material, thereby limiting their performance and usage in applications. The injection molded polyamide 66 spur gears were loaded by ground steel gear at different torques and frequencies using in-house realized servo motor driven gear test rig. Bidirectional loads at frequencies 2, 5, and 7.5 Hz and unidirectional loads at double the frequencies (4, 10, and 15 Hz) were applied on the polymer gears. The surface temperature of the gear due to the material hysteretic self-heating was continuously monitored and was recorded using an infrared thermal camera. Torque applied and angular displacement of the gear mesh were acquired to plot a hysteresis loop. The hysteresis loop area and surface temperature increase with the increase in the torque. Moreover, the bidirectional loads induce higher temperature than the unidirectional loads. This is because the gear tooth deflection increases under the bidirectional loads compared to that under the unidirectional loads for the tested frequencies. The fatigue life of the polymer gears was evaluated at higher frequency for different torques and was compared with that obtained at lower frequency. The gears tested at frequencies 15 and 7.5 Hz under unidirectional and bidirectional loads, respectively, exhibited inferior fatigue life compared to that at 10 and 5 Hz under unidirectional and bidirectional loads, respectively, because the temperature of the gear increases (30.6% and 43.7% for unidirectional and bidirectional loads, respectively) at higher frequencies. Both thermomechanical and root crack failures were observed under the bidirectional loads, whereas the gears exhibited only the root crack failures under the unidirectional loads. The failure morphology studied using the scanning electron microscope indicated straight root crack with overlapping fractured surfaces under both the bidirectional and unidirectional loads.
机译：在他们的使用寿命期间，齿轮在不同的转速/频率下进行不同的旋转速度/频率。转速对金属齿轮性能的影响是微不足道的;但是，它会影响润滑膜的厚度。聚合物齿轮由于材料的粘弹性行为而产生滞后自加热，从而限制了它们在应用中的性能和用法。注塑成型聚酰胺66正钢齿轮由地面钢齿轮装载，在不同的扭矩和频率使用内部实现伺服电机驱动齿轮试验台。在聚合物齿轮上施加双向频率2,5和7.5Hz处的双向载荷和7.5Hz的单向载荷，并在聚合物齿轮上施加频率（4,10和15 Hz）。连续监测由于材料滞后自加热引起的齿轮的表面温度，并使用红外线热相机记录。获取扭矩施加和齿轮网的角位移以绘制滞后回路。滞后环区域和表面温度随着扭矩的增加而增加。此外，双向载荷诱导比单向负载更高的温度。这是因为与测试频率的单向负载下方相比，齿轮齿偏转在双向载荷下增加。在不同扭矩的较高频率下评价聚合物齿轮的疲劳寿命，并与在较低频率下获得的频率进行比较。在单向和双向载荷下，在单向和双向载荷下，在单向和双向载荷下，在单向和双向载荷下分别在单向和双向载荷下，分别在单向和双向载荷下进行的齿轮分别表现出较差的疲劳寿命，因为齿轮的温度增加（30.6％和43.7％对于单向和双向负载，分别为更高的频率。在双向载荷下观察到热机械和根裂纹故障，而齿轮仅在单向负载下呈现根裂纹故障。使用扫描电子显微镜研究的失败形态表明了在双向和单向负载下的重叠裂缝表面的直根裂。

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