Observation and analysis of plastic instability in commercial pure Ti under dynamic simple shear

X.G.Deng; S.X.Hui; W.J.Ye; X.Y.Song

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Observation and analysis of plastic instability in commercial pure Ti under dynamic simple shear

机译：动态纯剪切作用下商品纯钛塑性不稳定性的观察与分析

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Modified split Hopkinson pressure bar was applied to realize dynamic simple shear within a limited narrow zone of the tested commercial pure Ti. The phenomenon of plastic flow instability, adiabatic shear band and crack was investigated by SEM, and the critical shear strain to activate unstable deformation was found to be 1.1 according to the deformed pattern of pre-gridded scratch lines on the specimen surface. Johnson-Cook constitute model and temperature rise equation were coupled to derive the adiabatic shear stress and strain curve, according to which critical condition was analyzed and fit well with the experimental values. The relationship between ASB propensity and metallurgical factors were also discussed.

机译：应用改进的剖分式霍普金森压力棒在测试的商用纯钛有限的狭窄区域内实现动态简单剪切。用扫描电镜（SEM）研究了塑性流动不稳定性，绝热剪切带和裂纹的现象，根据试样表面预先划伤的划痕线的变形方式，发现了激活不稳定变形的临界剪切应变为1.1。耦合Johnson-Cook结构模型和温升方程，得出绝热剪切应力和应变曲线，据此对临界条件进行了分析，与实验值吻合良好。还讨论了ASB倾向与冶金因素之间的关系。

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来源
《Materials Science and Engineering》 |2014年第26期|304-311|共8页
作者
X.G.Deng; S.X.Hui; W.J.Ye; X.Y.Song;
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作者单位

State Key Laboratory for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China;

State Key Laboratory for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China;

State Key Laboratory for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China;

State Key Laboratory for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals, Beijing 100088, China;

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正文语种 eng
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关键词
Plastic instability; Dynamic shear; High strain rate; Titanium;

机译：塑性不稳定性;动态剪切高应变率钛;

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Observation and analysis of plastic instability in commercial pure Ti under dynamic simple shear

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