摘要
以带微凹坑的软磁材料极薄带为研究对象,对不同凹坑形状和深度条件下极薄带拉伸过程的等效应力特征和疲劳寿命进行了数值模拟与分析。结果表明:模拟预测平均疲劳寿命与实验结果吻合良好,平均误差为8.4%。随着凹坑深度增加,等效应力集中区域扩大,平均疲劳寿命逐渐降低。矩形凹坑的等效应力集中区域产生在心部;椭圆形和圆形凹坑的等效应力集中区域产生在心部以及与外力拉伸方向垂直的凹坑边部区域。相同凹坑分布下,矩形凹坑、圆形凹坑和椭圆形凹坑对软磁材料极薄带平均疲劳寿命的影响依次增加。尽管较少凹坑点的存在使平均疲劳寿命有所增加,但变形不均匀产生的等效应力集中导致局部疲劳失效的风险显著提升,所以带材生产中应尽量避免凹坑存在。
Ultra-thin strip of soft magnetic material with micro-pits was taken as the research object,and numerical simulation and analysis were carried out on the equivalent stress characteristics during the tensile process and fatigue life of ultra-thin strips with different pit shapes and depths.The results show that the average fatigue life predicted by simulation is in good agreement with the experimental results,with the average error of 8.4%.As the pit depth increases,the equivalent stress concentration area expands,and the average fatigue life decreases gradually.The equivalent stress concentration area of rectangular pits is formed at the center;the equivalent stress concentration areas of elliptical and circular pits are formed at the center and the edge areas of the pits perpendicular to the external tensile direction.Under the same pits distribution,the influences of rectangular pits,circular pits and elliptical pits on the average fatigue life of ultra-thin strip of soft magnetic material increase in sequence.Although the presence of fewer pits increases the average fatigue life to a certain extent,the equivalent stress concentration caused by uneven deformation leads to significant increase in the risk of local fatigue failure.Therefore,the presence of pits should be avoided as much as possible in strip production.
作者
陈谭秋
梅瑞斌
包立
李广林
CHEN Tan-qiu;MEI Rui-bin;BAO Li;LI Guang-lin(School of Resources and Materials,Northeastern University at Qinhuangdao,Qinhuangdao 066004,China;State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,China;Shougang Zhixin Electromagnetic Materials Technology(Suzhou)Co.,Ltd.,Shougang Group,Suzhou 215400,Chnia)
出处
《塑性工程学报》
北大核心
2025年第10期220-227,共8页
Journal of Plasticity Engineering
基金
河北省自然科学基金资助项目(E2024501012)。
关键词
软磁材料极薄带
数值模拟
微凹坑
疲劳
应力
ultra-thin strip of soft magnetic material
numerical simulation
micro-pit
fatigue
stress
