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徐媛,向文丽,杨红斌,孙坤.TC6钛合金动态压缩变形中“应力塌陷”的形成原因[J].稀有金属材料与工程(英文),2016,45(4):1078~1081.[Xu Yuan,Xiang Wenli,Yang Hongbin and Sun Kun.On the formation cause of stress collapse in TC6 alloy under dynamic compression[J].Rare Metal Materials and Engineering,2016,45(4):1078~1081.]
On the formation cause of stress collapse in TC6 alloy under dynamic compression
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Received:September 18, 2015  Revised:November 16, 2015
DOI:
Key words: TC6 titanium alloy  adiabatic shear band  High strain rate  stress collapse
Foundation item:国家自然科学(51561002);云南省应用基础研究计划项目(2011FZ185)
Author NameAffiliation
Xu Yuan,Xiang Wenli,Yang Hongbin and Sun Kun  
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Abstract:
      Using the technology of split Hopkinson bar and a new method that can be used to interrupt test and obtain different amount of strain, dynamic compression test has been done on TC6 titanium alloy. By associating microstructure of shear band under different amount of strain with mechanical response of material, the formation cause of stress collapse in TC6 alloy under dynamic compression has been studied. It is shown that formation of adiabatic shear band of materials under high strain rate is a process composed of initiation, expansion and full development, and that stress collapse in stress-strain curvy is not resulted from the initiation and growing of adiabatic shear band, even involving cracks with its size not larger than certain critical size. Real reason of stress collapse in curvy is due to size of cracks has exceeded certain size within the adiabatic shear band.