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| 考虑应力比及温度影响的粉末高温合金短裂纹扩展模型研究 |
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徐宇飞1，胡殿印1,2,3，毛建兴1,2,3,4，刘新灵5，孙海鹤1,4，王荣桥1,2,3,6
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1.北京航空航天大学 航空发动机研究院，北京 100191;2.北京航空航天大学 航空发动机结构强度北京市重点实验室，北京 100191;3.中小型航空发动机联合研究中心，北京 100191;4.中国航发四川燃气涡轮研究院，四川 成都 610500;5.中国航发北京航空材料研究院，北京 100095;6.北京航空航天大学 能源与动力工程学院，北京 100191
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| 摘要: |
| 短裂纹扩展已成为先进粉末涡轮盘疲劳寿命预测的关键，为了准确模拟粉末高温合金材料短裂纹扩展阶段，针对FGH96粉末高温合金，重点关注应力比、温度对短裂纹扩展的影响规律，建立了一种工程适用的、基于Tanaka模型修正的短裂纹扩展寿命预测方法。模型采用裂纹闭合参数表征应力比影响、采用热力学理论表征温度影响，实现了不同应力比、温度条件下短裂纹扩展规律的统一描述，相比于传统模型在预测精度、工程适用性方面具有显著优势，与试验结果的相对误差小于20%。 |
| 关键词: 粉末高温合金 短裂纹扩展 工程适用 Tanaka模型 寿命预测 |
| DOI：10.13675/j.cnki.tjjs.2207063 |
| 分类号:TG132.3 |
| 基金项目:国家自然科学基金（52022007；51905020；51875020）；国家科技重大专项（2017-IV-0004-0041)。 |
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| Powder Superalloy Short Crack Growth Model Considering Effects of Stress Ratio and Temperature |
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XU Yu-fei1, HU Dian-yin1,2,3, MAO Jian-xing1,2,3,4, LIU Xin-ling5, SUN Hai-he1,4, WANG Rong-qiao1,2,3,6
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1.Research Institute of Aero-Engine，Beihang University，Beijing 100191，China;2.Beijing Key Laboratory of Aero-Engine Structure and Strength，Beihang University，Beijing 100191，China;3.United Research Center of Mid-Small Aero-Engine，Beijing 100191，China;4.AECC Sichuan Gas Turbine Establishment，Chengdu 610500，China;5.AECC Beijing Institute of Aeronautical Materials，Beijing 100095，China;6.School of Energy and Power Engineering，Beihang University，Beijing 100191，China
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| Abstract: |
| Short crack growth has become the key to the fatigue life prediction of advanced powder turbine disks. In order to accurately simulate the short crack growth stage of powder superalloy materials， the effects of stress ratio and temperature on short crack growth of FGH96 powder superalloy were focused in this paper， and a method of short crack growth life prediction based on Tanaka model modification was established， which was engineering suitable. The crack closure parameters were used to characterize the effect of stress ratio and the thermodynamic theory was used to characterize the effect of temperature. The unified description of short crack growth law under different stress ratios and temperatures is achieved. Compared with the traditional model， it has significant advantages in prediction accuracy and engineering applicability， and the relative error with test results is less than 20%. |
| Key words: Powder superalloy Short crack growth Engineering applicability Tanaka model Life prediction |
