共查询到17条相似文献,搜索用时 125 毫秒
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为研究药型罩对聚能射孔弹侵彻页岩储层的射孔和损伤致裂效果的影响机理,建立了射孔弹-空气-页岩三维模型,设置药型罩的锥角分别为50°、60°、70°和80°,壁厚分别为0.5、1.0和1.5 mm,材料分别为铜、钢、钛和钨。利用ANSYS/LS-DYNA软件进行数值计算,分别从射流速度与形态、页岩射孔效果及页岩孔裂隙形成规律特征等进行系统性分析。研究结果表明:在射孔弹结构中,随着药型罩锥角的减小,射流速度提高、杵体速度降低、侵彻深度增大同时开孔孔径减小。在一定范围内,适当减小药型罩的壁厚,可以提高射流速度、减小杵体质量、增大侵彻深度和开孔倾斜度。药型罩材料对射流速度、杵体结构和页岩射孔效果均有显著影响,其中钨药型罩射孔弹的侵彻深度最大但开孔孔径最小,钛药型罩射孔弹的侵彻深度最小但开孔倾斜度最大,铜比钢药型罩射孔弹的侵彻深度略大但开孔孔径略小。通过研究不同对照组的页岩孔裂隙形成规律特征发现,页岩孔裂隙发育主要发生在杵体对页岩的再扩孔阶段,减小射流初始扩孔孔径、增大杵体直径、提高杵体速度,可以促进页岩孔裂隙发育程度。 相似文献
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以球型空腔膨胀理论为基础,提出了一个计算陶瓷靶板阻力的损伤模型,该模型考虑了损伤因子对陶瓷靶板弹道性能的影响.结合不可压缩流体力学理论,对射流侵彻陶瓷靶板的侵彻速度进行了理论值计算,并与未考虑损伤的侵彻速度进行了比较,该模型的计算结果更接近实验结果.建立了射流侵彻陶瓷靶板的数值计算模型,对铜射流侵彻陶瓷靶的动态破坏过程进行了研究,讨论了药型罩的锥角、壁厚对射流侵彻结果的影响,结果表明:相同锥角的药型罩,壁厚对陶瓷靶板孔径的影响较小;同壁厚的药型罩,随着锥角的增大,侵彻孔径增大.侵彻速度的数值模拟结果与理论结果进行了比较,得到了较好的一致性. 相似文献
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聚能装药对混凝土靶板的侵彻研究 总被引:1,自引:0,他引:1
系统开展了不同药型罩材料、不同锥角、不同壁厚的聚能装药在不同炸高下侵彻混凝土试验, 研究了罩材料、锥角、壁厚、炸高等结构参数对漏斗坑直径、侵彻孔洞直径、漏斗坑深度以及侵彻深度等参数的影响规律;应用空腔膨胀理论计算了混凝土靶体阻力, 采用改进的伯努利方程和两阶段空腔膨胀理论获得了混凝土靶板在侵彻体作用下的侵彻深度和孔洞直径, 理论结果与试验结果基本吻合;基于AUTODYN 软件平台, 采用与试验一致的聚能装药结构, 开展了57 种工况下侵彻体成形过程的数值模拟研究, 并对其中典型工况的侵彻混凝土过程进行了数值模拟, 计算所得孔洞直径和侵彻深度与试验结果吻合较好, 在此基础上深入探讨了聚能装药作用下混凝土漏斗坑的形成机理, 分析表明, 铝药型罩的开坑机理不同于钢和铜药型罩. 相似文献
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旋压药型罩的旋转补偿效应与旋压参数关系的研究 总被引:2,自引:0,他引:2
旋压药型罩具有旋转补偿效应,可以部分抵消由于弹丸旋转而引起的射流旋转。选择了与旋转补偿效应有密切关系的正弦偏离率和纵向进给率两个重要参数对紫铜罩进行了旋压实验。利用X射线衍射方法在不同正弦偏离率和进给率条件下对旋压试件所形成的择优取向进行了检测;给出了旋转补偿能力随两个参数变化的曲线;对药型罩旋压前后,以及不同旋压参数下的金相组织进行了比较。 相似文献
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S. V. Fedorov A. V. Babkin S. V. Ladov G. A. Shvetsov A. D. Matrosov 《Journal of Applied Mechanics and Technical Physics》2007,48(3):393-400
The possibility of reducing the penetration capability of shaped charges by producing a magnetic field ahead of the target
with flux lines parallel to the charge axis is considered. The problem is studied on the basis of results of experiments in
which a magnetic field was produced in a shaped-charge liner before firing, resulting in a sharp reduction or elimination
of penetration. The variation of the magnetic induction in the shaped-charge liner moving in the magnetic field is calculated
using the model of two conducting coaxial cylindrical shells corresponding to the charge case and liner and assuming constant
induction-current density over the shell thickness. A longitudinal magnetic field is specified on the surface of the outer
shell as a function of the spatial distribution of the field ahead of the target and the charge velocity. The magnetic-field
intensity that can provide a considerable reduction in the penetration capability of shaped charges of various diameters is
estimated.
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Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 48, No. 3, pp. 112–120, May–June, 2007. 相似文献
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一种新型聚能战斗部的实验研究 总被引:3,自引:0,他引:3
本文根据能量利用的观点提出了一种新型聚能战斗部装药结构,指出开展其研究的重要价值;并对其射流与弹丸的成型过程和破甲机理进行了理论分析,在此基础上进行了系统的静破甲实验,并对该战斗部装药结构的一些关键结构参数(例如空孔孔径、炸高、小锥角聚能罩底面直径和锥角角度)和大、小锥角聚能罩材料之间的匹配关系对静破甲效果的影响进行了系统的分析研究。实验结果表明:在各自最佳炸高条件下,该新型聚能装药结构比普通EFP装药结构,在保持相当穿孔孔径、同等装药和壳体约束条件下,可以提高穿深达50%左右。进一步深化了聚能效应的内涵和丰富了打击目标的手段。 相似文献
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Experimental investigation of penetration performance of shaped charge into concrete targets 总被引:2,自引:1,他引:1
In order to develop a tandem warhead that can effectively destroy concrete targets, this paper explores the penetration performance of shaped charges with different cone angles and liner materials into concrete targets by means of experiments. The penetration process and the destruction mechanism of concrete targets by shaped charges and kinetic energy projectiles are analyzed and compared. Experimental results suggest that both kinetic energetic projectile and shaped charge are capable of destroying concrete targets, but the magnitudes of damage are different. Compared with a kinetic energy projectile, a shaped charge has more significant effect of penetration into the target, and causes very large spalling area. Hence, a shaped charge is quite suitable for first-stage charge of tandem warhead. It is also found that, with the increase of shaped charge liner cone angle, the depth of penetration decreases gradually while the hole diameter becomes larger. Penetration depth with copper liner is larger than of aluminum liner but hole diameter is relatively smaller, and the shaped charge with steel liner is between the above two cases. The shaped charge with a cone angle of 100° can form a jet projectile charge (JPC). With JPC, a hole with optimum depth and diameter on concrete targets can be formed, which guarantees that the second-stage warhead smoothly penetrates into the hole and explodes at the optimum depth to achieve the desired level of destruction in concrete targets. 相似文献
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一种形成尾翼型聚能侵彻体新方法的实验研究 总被引:2,自引:0,他引:2
尾翼可以提高聚能侵彻体的飞行稳定性,如何形成有一定规律性的尾翼在聚能侵彻体的研究中具有重要意义。在药型罩上粘附隔板,利用隔板改变爆轰波波阵面的结构形状,使药型罩上的爆轰压力发生规律变化,从而发生规律性的变形,最终形成带有尾翼的聚能侵彻体,这是一种新的形成尾翼的方法。从药型罩微元压垮速度变化和药型罩表面爆轰压力变化的角度出发,对新方法形成尾翼的机理进行了初步探讨。通过合理设计隔板的几何尺寸对该方法形成尾翼型聚能侵彻体进行试验,试验回收到了带有尾翼的聚能侵彻体,说明新方法形成尾翼具有一定的可行性。 相似文献