Tests for deformation and failure modes of GH4169 plates with different thickness under GCr15 projectile impact

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (7) : 199-206.

TAN Xueming1, GUO Weiguo1, LIN Dong1, GUO Xiaojun2, MENG Weihua2

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Abstract

In order to understand the dynamic mechanical characteristics of nickel-based superalloy GH4169 for aero-engine casing under high-speed impact load, the ballistic impact test of GH4169 target with different thickness (2mm, 3mm, 5mm, 6mm) was carried out using GCr15 cemented carbide sphere projectile and one-stage air gun with an impact velocity range of 96.7-314.3m/s. A systematic experimental study on the deformation, damage model and failure mechanism of the target under impact loading was carried out. The results show that with the increase of the thickness of the target, the deformation mode of the target gradually changes from the butterfly deformation dominated by tension and bending to the local shear deformation of the target; at the same time, the failure mode of the target plate changes from the coexistence mode of petal damage and plug to the single shear plug mode. Taking the ballistic limit velocity as the boundary, the energy absorption of the target shows different energy absorption rates. The deflection of the target is the largest near the ballistic limit velocity. There is a linear relationship between the number of cracks in the target and the velocity of the projectile. Compared with the experimental results at impact velocity 284.2m/s, the accuracy of the modified R-I formula for predicting the residual velocity of the projectile is 7.01% higher than that of the unmodified results.

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ballistic impact / nickel base superalloy / deformation and damage mode / residual velocity

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TAN Xueming1, GUO Weiguo1, LIN Dong1, GUO Xiaojun2, MENG Weihua2. Tests for deformation and failure modes of GH4169 plates with different thickness under GCr15 projectile impact[J]. Journal of Vibration and Shock, 2022, 41(7): 199-206

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