摘要
为研究洁净度对钢板抗弹性能的影响,用12.7 mm穿甲燃烧弹对厚度为18 mm、抗拉强度为2000 MPa、洁净度不同的40CrNi2Mo钢板进行抗弹性能测试。通过观察不同弹速下钢板出现的损伤形貌,评定背面强度极限,分析穿甲机理。结果表明:高洁净度钢板抗弹性能显著高于低洁净度钢板;高洁净度钢板穿甲机理为脱痂,与洁净度关系较小;超高强度钢板较低的绝热剪切临界失稳应变是产生绝热剪切和裂纹,进而产生脱痂破坏的主要原因,在脱痂破坏前,钢板仍以塑性扩孔方式消耗较多弹丸动能,抗弹性能相对较高;低洁净度钢板穿甲机理为崩落,与洁净度关系较大;较低的平面应变断裂韧度降低临界裂纹尺寸,导致崩落裂纹优先形核和扩展,消耗更低弹丸能量,提前终止了塑性扩孔,因此抗弹性能相对较低。
To research the influence of cleanness on ballistic behavior of steel targets,armor piercing projectiles with diameter of12.7 mm were fired at 40 CrNi2 Mo steel targets of 18 mm thickness and tensile strength 2 000 MPa with different cleanness. Theballistic limit was evaluated by observing impact craters at different projectile velocities,and the penetration mechanism wasanalyzed. The results show that the ballistic limit of the high cleanness steel targets is higher than the low cleanness steel targetsbecause of the difference between their penetration mechanism. The penetration mechanism of the high cleanness steel targets isscab removal,which is irrelevant to cleanness. The main cause of the formation of adiabatic shear bands,cracks and scabremoval is the lower adiabatic shear critical instability strain of the ultrahigh strength steel targets. The ballistic limit of the highcleanness steel targets is higher because of the more consumption of projectile kinetic energy before scab removal. Thepenetration mechanism of the low cleanness steel targets is spallation,which is relevant to cleanness. The priority nucleation andexpansion of spalling cracks result from the lower plane strain fracture toughness which reduces the critical crack size of spalling.The ballistic behavior of the low cleanness steel targets is lower,because the formation of spalling consumes less projectilekinetic energy and terminates the ductile hole enlargement earlier.
作者
李晓源
时捷
王晓东
LI Xiaoyuan;SHI Jie;WANG Xiaodong(Institute for Special Steels,Central Iron&Steel Research Institute,Beijing 100081,China;1nner Mongolia First Machinery Group Co.,Ltd,Baotou 014030,China)
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2020年第3期104-108,共5页
Ordnance Material Science and Engineering
