• CN:11-2187/TH
  • ISSN:0577-6686

›› 2010, Vol. 46 ›› Issue (20): 97-100.

• 论文 • 上一篇    下一篇

基于内耗的振动焊接焊缝力学分析

卢庆华;陈立功;于治水   

  1. 上海工程技术大学材料工程学院;上海交通大学材料科学与工程学院
  • 发布日期:2010-10-20

Mechanical Analysis of Weld Under Vibration Welding Based on Internal Friction

LU Qinghua;CHEN Ligong;YU Zhishui   

  1. School of Materials Engineering, Shanghai University of Engineering Science School of Materials Science and Engineering, Shanghai Jiao Tong University
  • Published:2010-10-20

摘要: 为了研究不同焊接热输入和振动加速度对焊缝内耗影响的规律,基于应变幅度的内耗,应用动态机械分析方法对不同振动焊接条件下焊缝金属进行测量,分析位错形态与密度对焊缝动态力学性能的影响。结果表明,振动加速度为0 m/s2时,通过对比0.001%应变幅度时不同热输入下的平均晶粒尺寸大小,可以看出焊接热输入越大焊缝组织越粗大、内耗越小,该结果显示出由于焊接热输入不同导致晶粒尺寸的差异对内耗的影响;6 m/s2时,随着应变幅度的增加,31.6 kJ/cm焊缝试样的内耗明显增加,显示位错钉扎、应变强化后特征;10 m/s2时,26.6 kJ/cm焊缝试样的位错密度最大,位错缠结最严重,内耗随着应变幅度的增加最先达到峰值,内耗的这种变化与可动位错长度与位错密度增加有关。

关键词: 内耗, 热输入, 振动, 微磨棒, 微磨床, 微细磨削, 微主轴

Abstract: In order to research the effect of welding heat input and vibratory acceleration on internal friction, the amplitude-dependent internal friction (ADIF) of welded metal under different vibration welding condition is tested by using dynamic mechanical analyzer (DMA). The influences of the dislocation shape and density on the dynamic mechanical property are analyzed. It shows that higher heat input leads to coarser microstructure and lesser internal friction in weld under 0.001% strain amplitude at the vibratory acceleration of 0 m/s2, which reveals the effect of grain size on ADIF with different heat inputs. When the vibratory acceleration is 6 m/s2, the internal friction at 31.6 kJ/cm increases obviously with the increase of strain amplitude, which shows the character after pinned dislocation and strain-strengthening. When the vibratory acceleration is 10 m/s2, dislocation density at 26.6 kJ/cm is the highest and dislocation tangle is most serious. The internal friction firstly reaches the peak with the increase of strain amplitude, such a change of the internal friction is related with the movable dislocation length and dislocation density.

Key words: Heat input, Internal friction, Vibration, Micro-grinding machines, Micro-grinding tools, Micro-spindles, Micro-grinding

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