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《Chinese Journal of Solid Mechanics》 2014-03
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TENSILE DYNAMIC CONSTITUTIVE MODEL OF 5083H111 ALUMINUM ALLOY AT A WIDE RANGE OF STRAIN RATES

Ning Yan;Guozheng Kang;Zhiwu Zhu;School of Mechanics and Engineering,Southwest Jiaotong University;  
Combined with tensile experimental data of 5083H111aluminum alloy at a wide range of strain rates from 2×10-4 to 4×102 s-1,the V-typed strain rate effect of this aluminum alloy is analyzed.The strain-rate and strain dependence of the logarithmic strain rate sensitivity coefficientλand tangent modulus Etare discussed.Then,a dynamic constitutive model is established to describe the dynamic tensile behavior of 5083H111aluminum alloy at a range of lower and middle strain-rates by modifying the Johnson-Cook model.The model captures successfully the V-typed strain-rate effect of tensile deformation of the aluminum alloy at the considered strain-rates,showing good agreement with the experimental ones.Furthermore,based on the logarithmic strain-rate sensitivity coefficientβof failure strain,a new equation to predict the tensile failure strain of the alloy is formulated,which is basically consistent with the experimental ones.
【Fund】: 牵引动力国家重点实验室自主重点课题(2011TPL-Z03)资助
【CateGory Index】: O347
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