AZ31B镁合金矫直过程中热力耦合模型下中性层偏移规律分析  

Analysis of Neutral Layer Offset Laws of AZ31B Magnesium Alloy During Straightening Under Thermo-Mechanical Coupling Model

作　　者：王亚东 刘翠荣[1] 马立峰[2] 李强[3] 李玉贵[1] 桂海莲[1] Wang Yadong;Liu Cuirong;Ma Lifeng;Li Qiang;Li Yugui;Gui Hailian(School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China;Technology Center,Taiyuan Heavy Industry Co.,Ltd,Taiyuan 030024,China)

机构地区：[1]太原科技大学材料科学与工程学院,山西太原030024 [2]太原科技大学机械工程学院,山西太原030024 [3]太原重型机械集团技术中心,山西太原030024

出　　处：《稀有金属材料与工程》2021年第12期4395-4401,共7页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2018YFA0707305,2018YFB1307902);山西省科技重大专项(20181102016);国家自然科学基金(51675362)。

摘　　要：为了提高镁合金板材的矫直精度,需要对镁板的中性层偏移规律进行分析。在室温下,镁合金的塑性较差且拉压不对称性也较大。并且镁板在室温下矫直时,压下量的控制不当会导致板材的矫直效果受到严重影响,因此,镁板常采用温矫的方法来提高矫直精度,而且温度是影响镁板拉压不对称性的重要因素。本研究基于CaBa2004拉压不对称性屈服准则,利用弹塑性力学的基本理论,推导了AZ31B镁板在矫直过程中中性层偏移量计算公式,运用ABAQUS有限元软件建立了热力耦合矫直模型,得出了不同温度下的中性层偏移规律,并利用实验对中性层偏移理论进行实验验证。To improve the straightening accuracy of magnesium alloy plates,the neutral layer offset low of magnesium plates was analyzed.At room temperature,the plasticity of magnesium alloy is poor and the tension-compression asymmetry is also large.And when the magnesium plate is straightened at room temperature,improper control of the amount of pressure will cause the straightening effect of the magnesium plate to be seriously affects.Therefore,temperature correction is often used to improve the straightening accuracy and the temperature is an important factor affecting the tension-compression asymmetry of magnesium plate.Based on the CaB a2004 tension-compression asymmetry yield criterion and the basic theory of elastoplastic mechanics,the formula for calculating the neutral layer offset in the straightening process of AZ31 B magnesium plate was derived.A thermo-mechanical coupling straightening model was established by ABAQUS finite element software to derive the neutral layer offset law at different temperatures,and the neutral layer offset theory was verified by experiment.

关 键 词：AZ31B 矫直 温度 拉压不对称性 热力耦合 中性层偏移 

分 类 号：TG146.22[一般工业技术—材料科学与工程]