Application of Lode dependent fracture criterion in predicting fracture of 6061-T6511H aluminium alloy Taylor rods

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (2) : 142-149.

YANG Qingnian,1 CHEN Xiaozhen,1 XIAO Xinke,1 LI Fan,2 ZHANG Wei 3

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Abstract

To examine the effectiveness of Lode parameter dependent fracture criterion, Taylor impact tests of 6061-T6511H aluminum alloy cylinder rods with the diameter of 5.9 mm in the impact velocity range of 163.4 ~ 327.7 m/s were conducted with a one-stage light gas gun, two deformation and fracture modes including upsetting cracking and shear one were identified. Material performance tests under various stress states and temperatures were conducted in order to characterize the mechanical behavior of 6061-T6511H aluminum alloy. Based on test results and the corresponding FE numerical computing ones, the modified Johnson-Cook constitutive model, the modified Johnson-Cook fracture criterion and a newly developed Lode parameter dependent fracture criterion were calibrated. Then, 3D finite element models were built in ABAQUS/Explicit, Lode parameter dependent fracture criterion calibrated and other parameter independent fracture criterions calibrated were adopted, respectively to numerically simulate Taylor impact tests. Results showed that Lode parameter dependent fracture criterion can reasonably predict fracture behaviors of Taylor rods made with 6061-T6511H aluminum alloy, while Lode parameter independent fracture criterions over-estate the material ductility and can’t predict the relevant fracture behaviors.

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impact dynamics / Taylor impact / fracture criterion / Lode parameter / numerical simulation

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YANG Qingnian,1 CHEN Xiaozhen,1 XIAO Xinke,1 LI Fan,2 ZHANG Wei 3. Application of Lode dependent fracture criterion in predicting fracture of 6061-T6511H aluminium alloy Taylor rods[J]. Journal of Vibration and Shock, 2018, 37(2): 142-149

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