欢迎访问《汽车安全与节能学报》，
汽车安全与节能学报

汽车安全与节能学报 ›› 2012, Vol. 3 ›› Issue (4): 390-400.DOI: 10.3969/j.issn.1674-8484.2012.04.013

• • 上一篇    

AZ31B-H24镁合金钣金件在多向加载下的力学性能实验研究

贾越阡，龙 翔，白远利   

  1. 中佛罗里达大学 机械与航空工程系，佛罗里达 32816，美国
  • 收稿日期:2012-10-19 出版日期:2012-12-25 发布日期:2013-01-05
  • 通讯作者: 白远利，副教授。E-mail ： bai@ucf.edu
  • 作者简介:贾越阡（1988-09-09），男（汉），山东，博士在读。E-mail ：yueqianjia@knights.ucf.edu

Experimental Study on Mechanical Properties of AZ31B-H24 Magnesium Alloy Sheets uder Multi-Axial Loading Conditions

JIA Yueqian, LONG Xiang, BAI Yuanli *   

  1. Department of Mechanical and Aerospace of Engineering, University of Central Florida, FL 32816, USA
  • Received:2012-10-19 Online:2012-12-25 Published:2013-01-05
  • Contact: BAI Yuanli ，Assistant Professor .E-mail ： bai@ucf.edu
  • Supported by:

    University of Central Florida Internal Funding

PDF

2957

摘要： 镁合金在汽车轻量化设计中富有前景。基于单向、双向和等双向拉伸的实验数据，本文研
究了AZ31B 镁合金钣金件的塑性和断裂特性；结果显示：在这两方面, AZ31B 有显著各向异性。标
定了Hill 1948、Barlat 1989 和Barlat 2003 的塑性本构模型，结果表明：在应用联合流动法则时，
上述模型均不能同时准确地预测不同材料方向下的强度和塑性流动；因此对于这种材料，推荐使用非
联合塑性流动法则。可用数字图像相关（DIC）技术和测量断裂处面积收缩技术来得到AZ31B 镁合金的
断裂应变；可用修正的 Mohr-Coulomb 断裂准则(MMC) 和断裂成形极限图(FFLD) 来预测材料断裂。

关键词: 汽车轻量化设计, 镁合金, 各向异性, 非联合流动法则, 断裂成形极限图(FFLD), 修正的
Mohr-Coulomb模型 (MMC)

Abstract: Since magnesium alloy is a promising engineering material for the automotive light-mass design, this
paper investigates the plasticity and fracture properties of AZ31B sheets based on the experimental results from
uniaxial, biaxial and equi-biaxial tensions. The results show that AZ31B displays remarkably anisotropy in both
plasticity and fracture. Hill-1948, Barlat-1989 and Barlat-2003 anisotropic constitutive models were calibrated
for plasticity. The results show that that none of the above models accurately describes both material strength
and plastic flow at various orientations if associated flow rules are assumed. Therefore, non-associated flow is
suggested for this material. The ductile fracture strains of AZ31B-H24 can be measured using two methods, the
correlation Digital Imaging Correlation (DIC) system and the fracture-initiation-locations area-reduction, with
the forecast results calculated using the fracture forming limit diagram (FFLD) and the modified Mohr-Coulomb
criterion (MMC).

Key words: automotive light-mass design, magnesium alloy, anisotropy, non-associated flow rule, fracture
forming limit diagram (FFLD), modified-Mohr-Coulomb (MMC)

中图分类号: