摘要
以航空发动机涡轮盘GH4133合金材料为例,通过比较和分析SWT模型和Morrow模型,综合考虑平均应力效应对低周疲劳寿命的影响,提出了一种改进的适合轮盘疲劳寿命预测的能量模型,进行了寿命预测和可靠性分析,并依据试验数据对能量模型进行拟合和模型验证。结果表明该方法有较高的准确性,能用于不同载荷谱下的疲劳寿命预测和可靠性评估。
A method for analysis of low cyclic fatigue （LCF） reliability is proposed based on analyzing the SWT model and the Morrow equation. In consideration of the effect of mean stress on LCF life, an improved energy-based fatigue life prediction model is developed for the life prediction and reliability assessment of turbine disks. Using the tests of aero-engine turbine disk material GH4133 as an example, the predicted fatigue life usinn the proposed model was found in very good agreement with the reported experimental data in literatures. Furthermore, the results show that the proposed method can be extended for the fatigue life prediction and reliability assessment under different loading spectra.
出处
《中国科技论文》
CAS
北大核心
2012年第8期616-621,共6页
China Sciencepaper
基金
国家自然科学基金资助项目(51075061)
高等学校博士学科点专项科研基金资助项目(20090185110019)
中央高校基本科研业务费资助项目(E022050205)
关键词
低周疲劳
涡轮盘
总应变能密度
寿命预测
可靠性分析
low cyclic fatigue
turbine disks
total swain energy density
life prediction
reliability analysis
