基于夾雜-細晶粒區-魚眼疲勞失效的超長壽命預測模型

鄧海龍; 李偉; 孫振鐸; 張震宇

doi:10.13374/j.issn2095-9389.2017.04.012

基于夾雜-細晶粒區-魚眼疲勞失效的超長壽命預測模型

doi: 10.13374/j.issn2095-9389.2017.04.012

北京理工大學機械與車輛學院, 北京 100081

基金項目:

國家自然科學基金資助項目(51305027)

詳細信息

中圖分類號: TG111.8
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出版歷程
- 收稿日期: 2016-07-06

Aprediction model for the very high cycle fatigue life for inclusion-FGA (fine granular area) -fisheye induced fatigue failure

School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

摘要

摘要: 本文旨在研究夾雜-細晶粒區-魚眼誘發疲勞失效的超長壽命預測模型.基于Cr-Ni-W合金鋼疲勞試驗結果,結合局部應力-壽命法和位錯-能量法,分別構建了局部裂紋萌生壽命模型(LCIL)和考慮夾雜及細晶粒區影響的裂紋萌生壽命模型(IFCIL),并與Tanaka-Mura模型(T-M)進行了對比分析.其次,分別對細晶粒區內的小裂紋擴展行為和細晶粒區外魚眼內的長裂紋擴展行為進行建模,最終形成了包含裂紋萌生和擴展在內的全壽命預測模型.結果表明,考慮夾雜及細晶粒區影響的裂紋萌生壽命模型(IFCIL)有較高的預測精度;對應細晶粒區的裂紋萌生壽命幾乎等同于全壽命;裂紋擴展壽命僅占據全壽命很小的一部分;預測結果全部處于2倍偏差以內,即全壽命模型可有效地用于夾雜-細晶粒區-魚眼誘發失效的超長壽命預測.
- 金屬疲勞 /
- 夾雜起裂 /
- 細晶粒區 /
- 魚眼 /
- 壽命預測
Abstract: A prediction model for the very high cycle fatigue life for inclusion-fine granular area (FGA) -fisheye-induced failure was studied in this work. Combined with the experimental results of Cr-Ni-W alloy steel, a local crack initiation life model (LCIL) and an inclusion-FGA based crack initiation life model (IFCIL) were developed on the basis of the local stress-life method and the dislocation-energy method, respectively. Using the Tanaka-Mura model as a reference, the fitting results of LCIL and IFCIL models were analyzed. Based on the respective modeling of the small crack growth within the FGA and the long crack growth outside the FGA within the fisheye, the total life model involving crack initiation and growth was established. As a result, combined with the results of three crack initiation life models, the IFCIL model exhibits the highest prediction precision, and the predicted crack initiation life associated with the FGA size is nearly equivalent to the total life. Conversely, the crack growth life only occupies a fine fraction of the total life. Between the predicted and experimental results, the agreement is fairly good within the factor-of-two boundaries. In short, the established total life model can be effectively used to predict the very high cycle fatigue life for the inclusion-FGA-fisheye induced failure.
- metal fatigue /
- inclusion induced crack /
- fine granular area /
- fisheye /
- life prediction

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參考文獻(20)

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