圆棒料斜轧曼内斯曼效应及新型混合损伤准则  

Mannesmann effect and new hybrid damage criterion for bar skew rolling

作　　者：林龙飞 张成 郭威 张小惠 彭文飞[1,3] LIN Long-fei;ZHANG Cheng;GUO Wei;ZHANG Xiao-hui;PENG Wen-fei(Faculty of Mechanical Engineering and Mechanics,Ningbo University,Ningbo 315211,China;School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Zhejiang Key Lab of Part Rolling Technology,Ningbo 315211,China)

机构地区：[1]宁波大学机械工程与力学学院,浙江宁波315211 [2]北京科技大学机械工程学院,北京100083 [3]浙江省零件轧制成形技术研究重点实验室,浙江宁波315211

出　　处：《塑性工程学报》2023年第12期192-203,共12页Journal of Plasticity Engineering

基　　金：国家重点研发计划(2018YFB1307900);国家自然科学基金资助项目(52075272);宁波市科技计划项目(2019B10100)。

摘　　要：采用有限元法分析了曼内斯曼效应的形成机理,在有限元分析的基础上提出了新型混合损伤准则以预测中心损伤,并开展了轧制实验以验证准则的预测效果,分析了工艺参数对中心损伤的影响规律。结果表明:棒料中心受到两向拉应力和一向压应力,且轧件中心温度大于外层温度,加剧了中心损伤累积,从而使中心处最容易产生疏松缺陷。由于新准则考虑了应力三轴度、变形温度及应变速率对损伤累积的影响,该准则对棒料斜轧、单轴拉伸均有较好的预测效果。采用该准则进行预测可知,中心损伤随着断面收缩率的增大而增大,随着精整长度的增大先增大后基本不变,随着成形角的增大先减小后增大,随着倾斜角的增大先减小后增大。The formation mechanism of Mannesmann effect was analyzed by finite element method.Based on the finite element analysis,a new hybrid damage criterion was proposed to predict control damage,and rolling tests were carried out to verify the prediction effects of the newly proposed criterion.The effect of process parameters on the central damage was analyzed.The results show that the center of the bar is subjected to two tensile stresses and one compressive stress,and the center temperature of rolling werepiece is higher than that of the outer layer,which aggravates the accumulation of central damage,so that the center is most prone to loose defects.Since the new criterion considers the effects of stress triaxiality,deformation temperature and strain rate on damage accumulation,the criterion has a good prediction effect on the skew rolling and uniaxial tension of the bar.It is shown that,the central damage increases with the increase of area reduction,increases first and then remains basically unchanged with the increase of sizing length,decreases first and then increases with the increase of forming angle,and decreases first and then increases with the increase of skewing angle by using the criterion to predict.

关 键 词：斜轧 曼内斯曼效应 中心疏松 混合损伤准则 

分 类 号：TG335.6[金属学及工艺—金属压力加工]