| 任意应力比下涡轮盘的塑性应变能寿命模型 |
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| 引用本文： | 苏运来,陆山,杨茂,谢立.任意应力比下涡轮盘的塑性应变能寿命模型[J].航空动力学报,2017,32(4):828-834. |
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| 作者姓名： | 苏运来 陆山 杨茂 谢立 |
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| 作者单位： | 西北工业大学 动力与能源学院， 西安 710072 |
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| 摘 要： | 以首次加、卸载时由于塑性变形导致循环应力应变曲线偏离弹性线的面积为损伤参量，从能量的角度建立了塑性应变能寿命模型，并运用平方插值的方法获得了任意应力比下塑性应变能和疲劳寿命的关系.利用某发动机涡轮盘的螺栓孔模拟试件与级间盘的跑道孔模拟试件的试验结果进行验证与对比.结果显示:根据应力比采用平方插值时塑性应变能寿命模型计算精度更高.螺栓孔试件的计算寿命与试验结果相差9.42%；跑道孔试件仅相差1.88%.总体上看，该模型计算结果与试验结果吻合很好，具有较高的精度.
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| 关 键 词： | 涡轮盘 塑性应变能 疲劳寿命 应力比 平方插值 |
| 收稿时间： | 2015/6/14 0:00:00 |
Plastic strain energy-life model of turbine disk under various stress ratios |
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| SU Yun-lai,LU Shan,YANG Mao,XIE Li.Plastic strain energy-life model of turbine disk under various stress ratios[J].Journal of Aerospace Power,2017,32(4):828-834. |
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| Authors: | SU Yun-lai LU Shan YANG Mao XIE Li |
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| Abstract: | The area of cyclic stress-strain curve deviated from elastic line due to plastic deformation in the first cycle was taken as fatigue damage parameter, and the plastic strain energy-life model was established from the perspective of energy. With the method of quadratic interpolation for stress ratio, the relation of plastic strain energy and fatigue life under various stress ratios could be obtained. The testing results of the simulated bolt-hole specimens of a turbine disk and the simulated runway-hole specimens of an interstage disk were used for comparison and validation. Results show that the method of quadratic interpolation is more accurate compared with linear interpolation for stress ratio when using the plastic strain energy-life model. The calculated life of simulated bolt-hole specimen is 9.42% less than testing life; meanwhile the calculated life is just 1.88% larger than testing life for the runway-hole specimen. In general, the results of the plastic strain energy-life model fit well with testing life, showing a higher accuracy. |
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| Keywords: | turbine disk plastic strain energy fatigue life stress ratio quadratic interpolation |
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