摘要
基于连续损伤力学建立的临界损伤参数在船舶设计和寿命评估上具有重要的工程应用价值。本文以船用10CrNiCu钢为研究对象,采用有限元方法对缺口试样的塑性变形进行分析,并在不同加载速率和不同试验温度条件下研究临界损伤参数的变化规律,同时借助扫描电镜分析试验后样品断口形貌。研究结果表明:缺口试样的塑性变形主要集中在缺口部位,缺口半径越小,等效塑性应变越大;加载速率对临界损伤参数的影响有限,在0.1~100 mm/min范围内,数据波动小于5%;试验温度对临界损伤参数影响较大,在-60~20℃范围内,临界损伤参数随温度升高而增加,增幅达14.4%;断口形貌特征表现出的规律与有限元分析和试验结果相一致。
The critical damage parameters based on continuum damage mechanics have an important engineering application value in ship design and life assessment.In this paper,the plastic deformation of notched 10CrNiCu steel was analyzed by finite element method,and the variation of critical damage parameters was studied under different loading rates and test temperatures.At the same time,the fracture morphology of the sample after test was analyzed by means of SEM.The results show that the plastic deformation of notched specimens is mainly concentrated in the notch,and that the smaller the notch radius is,the larger the equivalent plastic strain is.The influence of loading rate on the critical damage parameters is limited,and the data fluctuation is less than 5%in the range of 0.1-100 mm/min.The experimental temperature has a great influence on the critical damage parameters.In the range of-60℃to 20℃,the critical damage parameters increase with the increase of temperature,with an increase of 14.4%.The variation of fracture morphology is consistent with the results of finite element analysis and experiment.
作者
叶宏德
党恒耀
郭卫宏
张亚军
YE Hong-de;DANG Heng-yao;GUO Wei-hong;ZHANG Ya-jun(Luoyang Ship Material Research Institute,Luoyang 471023,China;Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipment,Luoyang 471023,China)
出处
《船舶力学》
EI
CSCD
北大核心
2022年第9期1335-1343,共9页
Journal of Ship Mechanics
基金
国防科工局技术基础资助项目(Z082012T001)。
关键词
临界损伤参数
有限元分析
加载速率
试验温度
船体钢
critical damage parameter
finite element analysis
loading rate
test temperature
hull steel
