| 基于局部应力应变场强法的薄壁缺口结构随机声疲劳寿命估算 |
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| 引用本文： | 唐金,沙云东,郭小鹏.基于局部应力应变场强法的薄壁缺口结构随机声疲劳寿命估算[J].沈阳航空工业学院学报,2010,27(3):30-34. |
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| 作者姓名： | 唐金 沙云东 郭小鹏 |
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| 作者单位： | 沈阳航空航天大学辽宁省数字化工艺仿真与实验技术重点实验室,辽宁沈阳,110136 |
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| 基金项目： | 航空基础科学基金资助基金项目 |
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| 摘 要： | 航空发动机火焰筒结构在随机声激励下的寿命估算属于典型的多轴疲劳问题。对航空薄壁结构随机声疲劳寿命估算的峰值概率密度法和功率谱密度法进行了探讨。在应力场强法的基础上,深入研究了一种用于薄壁缺口结构随机疲劳寿命估算的有效方法——局部应力应变场强法,该方法能同时考虑缺口局部应力梯度和应变梯度对疲劳损伤的影响。以薄壁缺口结构作为研究对象,结合声疲劳问题分析的一般方法,对局部应力应变场强法在声疲劳寿命估算中的运用进行了研究。
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| 关 键 词： | 声疲劳 疲劳寿命 应力概率密度 功率谱密度 局部应力应变场强 |
Acoustic fatigue life estimation of gap thin-walled structure by local stress-strain field intensity |
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| TANG Jin,SHA Yun-dong,GUO Xiao-peng.Acoustic fatigue life estimation of gap thin-walled structure by local stress-strain field intensity[J].Journal of Shenyang Institute of Aeronautical Engineering,2010,27(3):30-34. |
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| Authors: | TANG Jin SHA Yun-dong GUO Xiao-peng |
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| Institution: | (Liaoning Key Liaboratory of Digital Technology Simulation and Test Techniques,Shenyang Aerospace University,Liaoning Shenyang 110136) |
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| Abstract: | The life predication of an aero-engine combustor under random acoustic stress is a typical multi-axial fatigue problem.Two method in fatigue life predication：PDF and PSD are discussed.Based on the stress filed intensity,this paper discusses mainly a new approach for fatigue life prediction of thin-walled gap structure under random loads-local stress-strain filed intensity.The impact of local stress-strain gradient on fatigue damage is considered using this method.The method to predicate fatigue life of thin-walled gap structure under acoustic loads is studied also. |
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| Keywords: | acoustic fatigue fatigue life PDF PSD local stress-strain field intensity |
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