实际发射工况下底排药柱结构完整性的模拟计算  

Simulation Calculation on Structure Integrity of Base Bleed Grains in Launching Process

作　　者：武智慧[1] 钱建平[1] 刘荣忠[1] 牛公杰[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《火炸药学报》2014年第3期60-65,共6页Chinese Journal of Explosives & Propellants

摘　　要：采用线黏弹性本构模型描述底排药柱的力学性能,利用ABAQUS建立了实际发射工况下底排装置的物理模型,分析了底排药柱整体及不同截面不同位置点的应力形变规律。结果表明,底排药柱的危险应力点位于分瓣缝隙根部和药瓣中部,上端面是危险截面;适当增大底排药柱内腔孔径尺寸,能使危险点应力值、分瓣缝隙宽度增大值均减小10%以上,内腔下端孔径缩小程度减弱。在模拟分析的基础上,提出了增大底排药柱内腔孔径尺寸以减弱其结构过度形变的方法。发射试验结果表明,该方法可显著改善底排药柱的结构完整性,使底排药柱的燃烧及其排放规律趋于稳定,复合增程弹(HERP)的射程及密集度得到了保障。The mechanical properties of base bleed grain （BBG） were described by linear viscoelastic constitutive model. A physical model of base bleed unit in actual launching process was established by ABAQUS. The stress and deformation regularity of entire and point of different sections and locations of BBG were analyzed in detail. Results show that dangerous stress point of BBG is located in the root of the petal gap and the middle of petal. The upper section is the stress dangerous section. Decent increment of lumen diameter can make both dangerous stress and petal gap width increment diminish more than 10%, and lumen lower diameter decrement reduce. A method of increas- ing lumen diameter that can be used to diminish the large deformation of BBG is proposed based on simulation resuits. Launching tests show that this method can significantly improve the structure integrity of BBG, can make the combustion and emissions rules tend to be stable and can ensure the range and intensity of hybrid extended range projectile （HERP）

关 键 词：材料科学 底排药柱 结构完整性 发射工况 线黏弹性 复合增程弹 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] V512[航空宇航科学与技术—航空宇航推进理论与工程]