GCr15弹丸冲击不同厚度GH4169板的变形与破坏模式试验研究

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摘要为理解航空发动机包容机匣用镍基高温合金GH4169遭受高速冲击载荷时的动态力学特性, 本文采用GCr15硬质合金弹丸，利用一级空气炮试验装置对不同厚度(2mm、3mm、5mm、6mm)的GH4169靶板进行了弹丸速度从96.7m/s~314.2m/s的弹道冲击试验，对冲击载荷作用下靶板的变形、破坏模式和失效机理进行了系统的试验研究。结果表明：在试验冲击速度范围之内，随着靶板厚度的增加，靶板的变形模式逐渐由拉伸与弯曲主导的蝶形变形转变为局部的剪切变形；同时靶板的破坏模式由花瓣形损伤与冲塞共存模式向单一剪切冲塞模式转变；随着冲击速度的增加,靶板对弹丸动能的吸收能量是逐渐增加的，但在临界穿透速度时出现一个拐点，使得靶板被击穿后吸收能能量的增速变缓，表明靶板被穿透破坏后降低其的吸能能力; 当冲击速度为临界穿透速度时靶板变形挠度达到最大值; 冲击后靶板的花瓣裂纹数量与弹体速度呈线性关系。当入射速度为284m/s时，与试验结果比较，修正后R-I公式预测弹丸剩余速度比未修正的结果精度提高7.01%。

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	谭学明1
	郭伟国1
	林栋1
	郭小军2
	孟卫华2

关键词 ：弹道冲击, 镍基高温合金, 变形与破坏模式, 剩余速度

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.

Key words： ballistic impact nickel base superalloy deformation and damage mode residual velocity

收稿日期: 2020-08-27 出版日期: 2022-04-15

引用本文:

谭学明1，郭伟国1，林栋1，郭小军2，孟卫华2. GCr15弹丸冲击不同厚度GH4169板的变形与破坏模式试验研究[J]. 振动与冲击, 2022, 41(7): 199-206.
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. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(7): 199-206.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I7/199

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