...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Frattura e Integrita Strutturale >Study of spatial-time inhomogeneity of serrated plastic flow Al-Mg alloy: using DIC-technique
【24h】

Study of spatial-time inhomogeneity of serrated plastic flow Al-Mg alloy: using DIC-technique

机译：锯齿状塑性流动Al-Mg合金时空不均匀性的研究：利用DIC技术

获取原文
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The aim of the present paper is the investigation of temporal instabilities and spatial localizationdue to the Lüders behavior, the Portevin–Le Chatelier effect and the shoulder or necking effect during uniaxialtension tests of aluminum-magnesium alloy. This paper presents the brief description of the test procedure andexperimental results of carrying out research by the combined use of a servo-hydraulic biaxial test systemInstron 8850 and a non-contact 3-D digital image correlation measurement system Vic-3D. The digital imagecorrelation is a highly effective computer-vision-based technique, which provides estimation of thedisplacement and strain fields on specimen surface by matching the reference subsets in the undeformed image(before loading) with the target subsets in the deformed images (captured during test). The evolution ofinhomogeneous axial strain and axial strain rate fields has been illustrated for each stage of material’sdeformation. To estimate the kinematics of serrated or jerky flow due to the strain bands propagation, the strainversus time curves and strain diagrams are given here. The experimental results show the recurrence in thestrain distribution leveling along the specimen gauge. The changing between the macroscopic localization of theplastic flow, namely the running of the Lüders and PLC bands and the recovery of strain field homogeneity, hasbeen observed.
机译：本文的目的是研究铝镁合金单轴拉伸试验中由于Lüders行为，Portevin-Le Chatelier效应以及肩或颈缩效应引起的时间不稳定性和空间局部性。本文简要介绍了将伺服液压双轴测试系统Instron 8850和非接触式3D数字图像相关测量系统Vic-3D结合使用进行测试的测试过程和实验结果。数字图像相关性是一种基于计算机视觉的高效技术，它通过将未变形图像中的参考子集（加载前）与变形图像中的目标子集（在测试过程中捕获）进行匹配，提供对标本表面上位移和应变场的估计）。已经说明了材料变形的每个阶段的不均匀轴向应变和轴向应变率场的演变。为了估计由于应变带传播而产生的锯齿状或急流的运动学，此处给出了应变时间曲线和应变图。实验结果表明，应变分布水平沿着试样规再次出现。已经观察到塑性流的宏观定位，即Lüders和PLC带的运行与应变场均匀性的恢复之间的变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号