工程科学学报2017，Vol.39Issue(4)：567-573,7.DOI:10.13374/j.issn2095-9389.2017.04.012
基于夹杂-细晶粒区-鱼眼疲劳失效的超长寿命预测模型
Aprediction model for the very high cycle fatigue life for inclusion-FGA (fine granular area)-fisheye induced fatigue failure
摘要
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.关键词
金属疲劳/夹杂起裂/细晶粒区/鱼眼/寿命预测Key words
metal fatigue/inclusion induced crack/fine granular area/fisheye/life prediction分类
矿业与冶金引用本文复制引用
邓海龙,李伟,孙振铎,张震宇..基于夹杂-细晶粒区-鱼眼疲劳失效的超长寿命预测模型[J].工程科学学报,2017,39(4):567-573,7.基金项目
国家自然科学基金资助项目(51305027) （51305027）
