高级搜索

您是今天第:455位访问者

您是第:6613251位访问者

PBX装药弹体侵彻混凝土薄板的数值模拟
Numerical Simulation on the Dynamic Damage of PBX Charges Filled in Projectiles During Penetrating Thin Concrete Targets
  • 摘要
  •  
  • 参考文献
  •  
  • 引证文献
  •  
  • 相似文献
中文摘要:
      为探究浇注型高聚物粘结炸药(PBX)装药在弹体侵彻过程中的力学响应和损伤分布情况,将孔隙压塌损伤、炸药晶体破碎损伤和粘结剂脱粘三种损伤形式的演化规律引入粘弹性本构模型,拟合了浇注型PBX在不同温度下的低应变率至中高应变率的力学响应,利用动力有限元数值软件模拟了含装药弹体侵彻混凝土靶板中炸药的力学损伤响应,分析了炸药应力波的传播、压力分布和三种损伤分布及演化。结果表明,加载初期炸药装药的头部承受较大的压缩应力,当应力波传播至尾部反射回拉伸波时,由于弹体的惯性作用,装药尾部和壳体内表面发生撞击,迅速形成高压区,压力高至0.25 GPa,因此装药头部和尾部损伤较为严重,应作为重点防护区域。
中文关键词: 高聚物粘结炸药(PBX)  弹体侵彻  粘弹性模型  脱粘损伤  晶体破碎损伤
英文摘要:
      This paper is devoted to the building of a viscoelastic model based on actual damage mechanisms for explosive charges filled in projectiles during penetrating concrete targets. The characteristic damage modes present in polymer bonded explosive(PBX)s include intragranular voids, crystal fractures, and interfacial debonding. Quasi-static uniaxial compression tests and split-Hopkinson pressure bar tests were modelled to study mechanical responses and damage evolutions of PBXs at different loading conditions, and the dynamic finite element algorithm was applied to estimate the mechanical responses of PBXs under low intensity stimulus. Analyzing the damage and pressure distributions and the variations of different damages, the position of PBXs that is ready to be ignited, we find that the initial loading of the explosive charge head is suffered from the greater compressive stress. When the stress wave is propagated to the tail, reflected tensile waves are produced. Furthermore, the pressure increases rapidly to 0.25 GPa, leading to the more serious damages on the head and the tail, attributed to the inertia of the projectile body and the collision between the charge tail and the inner surface of the shell. It suggests that the head and the tail could be two key protection areas.
英文关键词: polymer bonded explosive(PBX)  projectile penetration  viscoelastic model  interfacial debonding damage  crystal fragmentation damage
DOI:10.11943/j.issn.1006-9941.2018.01.013
基金项目:国家自然科学基金资助(11572045;11472051); 国防基础科研挑战计划(TZ2016001)
引用文献:张馨予,吴艳青,黄风雷.PBX装药弹体侵彻混凝土薄板的数值模拟[J].含能材料,2018,26(1):101~108
作者单位E-mail
张馨予 北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081 6120110498@bit.edu.cn,wuyqing@bit.edu.cn 
吴艳青 北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081 wuyqing@bit.edu.cn 
黄风雷 北京理工大学 爆炸科学与技术国家重点实验室, 北京 100081  
摘要点击次数: 517
全文下载次数: 293
HTML 查看全文   查看/发表评论   下载PDF阅读器

更多>>

更多>>

分享按钮