Identification and Verification of Dynamic Mechanical Properties of 1060 Aluminum Based on Johnson-Cook Constitutive Model
In order to establish the dynamic constitutive model of 1060 aluminum material,the quasi-static tensile mechanical properties of 1060 aluminum in a temperature range from 25 ℃ to 300 ℃ were investigated by using a universal material testing machine,and the dynamic tensile mechanical properties of 1060 aluminum in a strain rate range from 0.01 s-1 to 4 922 s-1 were also investigated by using a Hopkinson pull rod device.Based on the Johnson-Cook constitutive model and test results,the dynamic mechanical properties of the 1060 aluminum were fitted to obtain the material's constitutive parameters.In order to verify the accuracy of the constitutive model,the impact deformation test and impact deformation simulation analysis of 1060 aluminum thin plate structure were carried out respectively.The results show that the 1060 aluminum exhibits obvious strain hardening characteristics and strain rate strengthening effects when the strain rate changes from quasi-static to high strain rate,the true stress are increases with the increase of strain rate under the same ture strain,and the material exhibits low strain rate sensitivity in the range of high strain rate.In addition,the 1060 aluminum exhibit significant thermal softening effect,the yield strength of the material decreases with the increase of temperature.Besides,the identified Johnson-Cook constitutive model can be used to simulate the deformation of 1060 aluminum sheet structure under impact load,the relative error is only 2.01％～8.86％,the results indicate that the established models can predict the tensile mechanical response of the 1060 aluminum under a complex stress state.
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维普
