Analysis and Experimental Verification of Dynamic Shear Test for Hat-shaped Specimen

doi:10.3969/j.issn.1000-1093.2017.12.020

Abstract

Abstract: The stress states of shear zone for hat-shaped specimens loaded by split Hopkinson pressure bars are studied by theoretical analysis and numerical simulation. The shear test for the closed flat hat-shaped specimens of TA2 titanium is carry out, and the shear strain is measured directly by the two-dimensional digital image correlation (DIC-2D) method. The results show that it can be used as state of pure shear only if the Lode parameters μ_σ meet the condition of -0.46<μ_σ< 0.46 and the experimental data processing error is less than 3.4%. The dynamic constitutive curves obtained by shear testing are in agreement with the curves of cylindrical compression. The shear testing stress-strain curve softens once adiabatic shear bands (ASBs) form in the hat-shaped specimens, and the stress-strain curve reflects the initiation and evolution processes of ASBs. Key

Key words: solidmechanics, hat-shapedspecimen, stressstate, dynamicconstitutivecharacteristic, adiabaticshearband, digitalimagecorrelationmethod

CLC Number:

O347.3

ZHOU Gang-yi， DONG Xin-long， FU Ying-qian. Analysis and Experimental Verification of Dynamic Shear Test for Hat-shaped Specimen[J]. Acta Armamentarii, 2017, 38(12): 2455-2462.

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第38卷第12期
2017 年12月兵工学报ACTA
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