| 基于应力循环特征的裂纹萌生寿命预测方法 |
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| 引用本文： | 魏大盛,王延荣,王相平,王洪斌.基于应力循环特征的裂纹萌生寿命预测方法[J].航空动力学报,2012,27(10):2342-2347. |
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| 作者姓名： | 魏大盛 王延荣 王相平 王洪斌 |
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| 作者单位： | 1. 北京航空航天大学能源与动力工程学院,北京,100191
2. 中国航空工业集团公司沈阳发动机设计研究所,沈阳,110015 |
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| 基金项目： | 国家自然科学基金(51105023) |
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| 摘 要： | 以两种镍基高温合金的应力循环特征为基础，即粉末高温合金FCH95的循环硬化继而软化及变形高温合金CH4169的循环软化特性，寻求载荷历程相关的损伤参量，进而建立应力弱化损伤模型，以考虑载荷历程对疲劳寿命的影响.建立的应力弱化损伤模型可以较好地预测不同循环载荷条件下的疲劳寿命，其预测精度不低于传统方法，且优势在于使建立模型所需要的试样数量大大减少.
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| 关 键 词： | 裂纹萌生 寿命预测 粉末高温合金 循环硬化 循环软化 |
| 收稿时间： | 2012/2/29 0:00:00 |
Life prediction method based on characteristic of cyclic stress |
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| WEI Da-sheng,WANG Yan-rong,WANG Xiang-ping and WANG Hong-bin.Life prediction method based on characteristic of cyclic stress[J].Journal of Aerospace Power,2012,27(10):2342-2347. |
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| Authors: | WEI Da-sheng WANG Yan-rong WANG Xiang-ping and WANG Hong-bin |
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| Institution: | School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China;School of Jet Propulsion, Beijing University of Aeronautics and Astronautics,Beijing 100191,China;Shenyang Aeroengine Design and Research Institute,Shenyang 110015,China;Shenyang Aeroengine Design and Research Institute,Shenyang 110015,China |
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| Abstract: | Based on the characteristics of cyclic stress of two nickel-based superalloys, i.e .,the cyclic softening followed by hardening of powder metallurgy (PM) FGH95 and the cyclic softening of cast GH4169,a stress-weaken damage model (SWDM) was established to evaluate the effect of load histories on lives.The model can be used to predict the fatigue lives under different cyclic loading conditions,of which prediction the accuracy is not less than that of traditional methods,and its most significant advantage is to greatly reduce the number of samples for life modeling. |
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| Keywords: | crack initiation life prediction powder metallurgy cyclic hardening cyclic softening |
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