采用非线性动态有限元程序Ls- dyna和损伤累积层裂判据，对滑移爆轰加载下圆钢管的层裂破坏进行了二维数值模拟，分析了钢管层裂发生的物理过程。计算结果表明，炸药与钢管界面处冲击波的折射角随着传播距离增加而增大，钢管中冲击波峰值不断衰减；由于非正向传播的波的相互作用，管内壁自由面速度波形振荡峰值随着时间逐渐减小，振荡周期逐渐加长；要使钢管发生层裂，装药厚度存在上下临界值，在临界值范围内初始层裂片厚度随着装药厚度增加而增大。
Abstract
By means of an explicit nonlinear dynamic finite element computer code Ls-dyna, the spalla?tion in a cylindrical steel tube loaded by sliding-implosion was studied, and with a Tuler-Buctcher dam?age model, the physical process of spallation was reproduced. The simulation results show that I) the refraction angle of shock wave increases with the increase of propagative distance at the interface of ex?plosive and the cylindrical steel tube; 2) the oscillations of inner free surface velocity become weaker, but the periods get longer due to the interaction between the oblique incident wave and the reflection wave; 3) a critical value exists in the thickness of explosive leading to the spallation inside the cylindri?cal steel tube, and the initial spall thickness increases with the increase of the explosive thickness.
关键词
爆炸力学 /
滑移爆轰 /
层裂 /
二维数值计算
{{custom_keyword}} /
Key words
explosion mechanics /
sliding-implosion /
spallation /
two-dimensional numerical computa?tion
{{custom_keyword}} /
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] Hiroe T, Matsuo H, Fujiwara K, et al. Dynamic behavior ot ma-terials induced by explosive loadings initiated using wire explosion techniques[j]. Journal of Materials Processing Technology, 1999， 85:56-59.
[2] Tugcu P. Instability and ductile failure of thin cylindrical tubes under internal pressure impact [ J ] . Int Journal of Impact Engi?neering, 2003,28：183 — 205.
[3] Balagansky I A, Karanik Y A, Agureikin V A, et al. Fracture behavior of explosively loaded spherical molded steel shells [ J ]. Theoretical & Applied Fracture Mechanics, 2001，36： 165 — 173.
[4] Singh M, Suneja H R，Bola M S, et al. Dynamic tensile deforma?tion and fracture of metal cylinders at high strain rates [ J.]. Int Journal of Impact Engineering, 2002，27:939 - 954.
[5] ИвановА Г.Особеностиосесимметричногосхожленияоткольныхслоеввстальных цилинцрических оволочках[J]ПМТФ, 1984,3:125-127.
[6] 董玉斌，苏林祥，陈大年，等.滑移爆轰作用下内爆柱形钢壳层 裂的数值研究[J].高压物理学报，1989，3(1):1-9.
DONG Yu-bin, SU Lin-xiang, CHEN Da-nian, et al. Numerical simulation on the spallation of a steel cylindrical shell imploded un?der slipping detonation [ J ]. Chinese J ournal of High Pressure Physics, 1989，3(1):1 —9. (in Chinese)
[7] 李雪梅，金孝刚，李大红.钢圆管在内爆加载下的层裂特性研 究[J].爆炸与冲击，2005，25(2) :107— 111.
Li Xue-mei, JIN Aiao-gang, Li Da-hong. The spall cnaracteris- tics of cylindrical steel tube under inward explosion loading [ J ]. Explosion and Shock Waves, 2005，25(2) : 107 — 111. (in Chi?nese)
[8] 李雪梅.内爆加载下钢圆管的变形、损伤及层裂研究[D].合肥：中国科学技术大学,2003.
LI Xue-me1. An investigation on the deiormation，damage and spall of cylindrical steel tube loaded by sliding- implosion [ D ]. Hefei ： University of Science and Technology of China, 2003.(in Chinese)
[9] 陈大年，王德生，马松合，等.两类动态断裂[J].爆炸与冲击， 1987，7(2) :26-33.
CHEN Da-nian, WANG De-sheng, MA Song-he, et al. Two kinds of dynamic fractures [J ]. Explosion and Shock Waves, 1987,7(2):26-33. (in Chinese)
[10] Tuler F R，Butcher B M. A criterion for the time dependence of dy?namic fracture[j]. Int J Fracture Mech, 1968，4(4) :431 - 437.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
