工程科学学报，第39卷，第4期：567573,2017年4月 Chinese Journal of Engineering,Vol.39,No.4:567-573,April 2017 DOI:10.13374/j.issn2095-9389.2017.04.012:http://journals.ustb.edu.cn 基于夹杂一细晶粒区一鱼眼疲劳失效的超长寿命预测 模型 邓海龙，李伟区，孙振铎，张震宇 北京理工大学机械与车辆学院，北京100081 区通信作者，E-mail:liw@bit.edu.cm 摘要本文旨在研究夹杂一细晶粒区一鱼眼诱发疲劳失效的超长寿命预测模型.基于C一Ni-W合金钢疲劳试验结果，结 合局部应力一寿命法和位错一能量法，分别构建了局部裂纹萌生寿命模型(LCL)和考虑夹杂及细晶粒区影响的裂纹萌生寿命 模型(FCL),并与Tanaka--Mura模型(T-M)进行了对比分析.其次，分别对细晶粒区内的小裂纹扩展行为和细晶粒区外鱼 眼内的长裂纹扩展行为进行建模，最终形成了包含裂纹萌生和扩展在内的全寿命预测模型.结果表明，考虑夹杂及细晶粒区 影响的裂纹萌生寿命模型(FCL)有较高的预测精度：对应细晶粒区的裂纹萌生寿命几乎等同于全寿命：裂纹扩展寿命仅占 据全寿命很小的一部分：预测结果全部处于2倍偏差以内，即全寿命模型可有效地用于夹杂一细晶粒区一鱼眼诱发失效的超长 寿命预测. 关键词金属疲劳：夹杂起裂：细晶粒区；鱼眼；寿命预测 分类号TG111.8 Aprediction model for the very high cycle fatigue life for inclusion-FGA (fine granular area)-fisheye induced fatigue failure DENG Hai-ong,LI Wei,SUN Zhen-duo,ZHANG Zhen-yu School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China Corresponding author,E-mail:lliw@bit.edu.cn 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 asso- ciated 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 es- tablished total life model can be effectively used to predict the very high cycle fatigue life for the inclusion-FGA-fisheye induced fail- ure. KEY WORDS metal fatigue:inclusion induced crack:fine granular area:fisheye:life prediction 收稿日期：2016-07-06 基金项目：国家自然科学基金资助项目(51305027)工程科学学报，第 39 卷，第 4 期: 567--573，2017 年 4 月 Chinese Journal of Engineering，Vol． 39，No． 4: 567--573，April 2017 DOI: 10． 13374 /j． issn2095--9389． 2017． 04． 012; http: / /journals． ustb． edu． cn 基于夹杂--细晶粒区--鱼眼疲劳失效的超长寿命预测 模型 邓海龙，李 伟，孙振铎，张震宇 北京理工大学机械与车辆学院，北京 100081 通信作者，E-mail: lliw@ bit． edu． cn 摘 要 本文旨在研究夹杂--细晶粒区--鱼眼诱发疲劳失效的超长寿命预测模型． 基于 Cr--Ni － W 合金钢疲劳试验结果，结 合局部应力--寿命法和位错--能量法，分别构建了局部裂纹萌生寿命模型( LCIL) 和考虑夹杂及细晶粒区影响的裂纹萌生寿命 模型( IFCIL) ，并与 Tanaka--Mura 模型( T--M) 进行了对比分析． 其次，分别对细晶粒区内的小裂纹扩展行为和细晶粒区外鱼 眼内的长裂纹扩展行为进行建模，最终形成了包含裂纹萌生和扩展在内的全寿命预测模型． 结果表明，考虑夹杂及细晶粒区 影响的裂纹萌生寿命模型( IFCIL) 有较高的预测精度; 对应细晶粒区的裂纹萌生寿命几乎等同于全寿命; 裂纹扩展寿命仅占 据全寿命很小的一部分; 预测结果全部处于 2 倍偏差以内，即全寿命模型可有效地用于夹杂--细晶粒区--鱼眼诱发失效的超长 寿命预测． 关键词 金属疲劳; 夹杂起裂; 细晶粒区; 鱼眼; 寿命预测 分类号 TG111. 8 收稿日期: 2016--07--06 基金项目: 国家自然科学基金资助项目( 51305027) Aprediction model for the very high cycle fatigue life for inclusion--FGA ( fine granular area) --fisheye induced fatigue failure DENG Hai-long，LI Wei ，SUN Zhen-duo，ZHANG Zhen-yu School of Mechanical Engineering，Beijing Institute of Technology，Beijing 100081，China Corresponding author，E-mail: lliw@ bit． edu． cn 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 asso￾ciated 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 es￾tablished total life model can be effectively used to predict the very high cycle fatigue life for the inclusion--FGA--fisheye induced fail￾ure． KEY WOＲDS metal fatigue; inclusion induced crack; fine granular area; fisheye; life prediction