排序方式: 共有139条查询结果,搜索用时 15 毫秒
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针对爆炸成形弹丸(EFP)的成型及侵彻钢结构靶板的问题运用无网格数值方法 SPH法进行了数值模拟研究。计算中采用完全变光滑长度SPH方法解决模拟爆炸过程中密度等物理参量变化梯度剧烈的问题,利用Ott-Schnetter提出的修正SPH方法处理在求解多介质大密度差问题时遇到的数值不稳定性问题,运用含损伤的Johnson-Cook本构模型处理钢板在冲击载荷下的变形与损伤问题;结果分析了弹丸头部特定节点处的速度变化历程,同时分析了不同药罩厚度对弹丸头部速度及对靶板侵彻过程的影响及不同尺寸的靶板在弹丸侵彻作用下的破坏形式,结果符合弹丸侵彻物理规律,表明该方法适合模拟爆炸与冲击等大变形破坏损伤问题。 相似文献
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基于双锥形药型罩的优点,采用线性EFP设计思想,提出了一种双锥结构的LEFP的设计方法.将线性EFP的药型罩设计成双锥形结构,应用ANSYS/LS-DYNA软件对其进行数值模拟仿真,分析了不同双锥位置时线性EFP的初速及侵彻钢靶效果.结果表明:合适的双锥结构较常规锥形罩可以明显提高该种战斗部的毁伤效果,从而为提高LEFP的防空反导能力提供参考依据. 相似文献
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摘 要:爆炸成型弹丸(Explosively Formed Projectiles,简称EFP)垂直高速冲击603装甲靶板实验,呈现了靶板入口卷边花瓣状破坏、出口具有拉伸断裂特征的外翻花瓣形穿孔、入口直径明显大于出口直径等宏观的冲击现象。为了从机理上研究EFP对装甲靶板的高速冲击效应,利用ANSYS/LS-DYNA动力学仿真软件,对整个冲击过程进行了数值模拟,再现了EFP形成、开坑、稳定侵彻、尾翼侵彻和冲塞贯穿的物理过程,模拟结果与实验现象吻合较好,并从原理上分析了实验中各宏观现象产生的原因。研究结果不但认识了EFP冲击装甲靶板的机理,也可为增强装甲防护能力和优化EFP设计提供理论参考,具有重要的现实意义和较高的工程应用价值。 相似文献
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为增大毁伤面积并提高侵彻能力,设计不同结构的爆炸成型弹丸(explosively formed penetrator,EFP)/预
制破片复合战斗部,综合挡环结构及预制破片钨球的排布方式,得到4 种方案。应用ANSYS/LS-DYNA 对战斗部
成型过程进行数值模拟,通过不同战斗部结构方案分析,研究挡环结构及预控破片排布方式对毁伤元成型过程和毁
伤效果的影响。结果表明:当挡环顶部与药型罩底部处于同一平面时,形成的EFP 速度更高、长径比更大、长度更
长,且内圈钨球的轴向速度更高;采用内圈钨球26 枚、外圈钨球32 枚的钨球排布方式的战斗部,其内、外圈钨球
发散角更大,能形成具有良好侵彻能力且密度均匀的破片场,仿真与实验结果一致。 相似文献
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G. Hussain A. Hameed J. G. Hetherington A. Q. Malik K. Sanaullah 《Journal of Energetic Materials》2013,31(2):100-114
There are many methods that can be used for the clearance of underwater ammunition; for example, sea mines. In all such techniques, the primary aim is to defuse underwater ammunition without detonation. Explosively formed projectiles (EFPs) have great potential to cleanly and safely defuse underwater ammunition. Underwater simulations and experiments were conducted to highlight the use of EFPs for safe destruction of sea mines. The copper liner configuration was used to study the penetration performance of the EFPs in water. ANSYS AUTODYN-2D hydrocode was used to simulate copper EFP penetration, passage, and impact with a target immersed in water. Simulation results were obtained by making use of Lagrangian and Euler formulations. The results indicated that the velocity of an EFP reduces sharply as it enters the water. However, the velocity of an EFP is stable in the later part of its flight through the water. The results further indicated that after covering five cone diameters (CDs) in water, the velocity of the EFP was reduced below critical and it failed to perforate an aluminum target plate of 5 mm thickness. Nevertheless, it perforated the target plate at 4 CDs in water. A known quantity of high explosive sandwiched between two plates, just like explosive reactive armor (ERA), was used as a target to simulate the sea mine. Flash X-ray was also used to record the flight and penetration of the EFP through the target plate. Simulation results matched reasonably well with the experimental results. 相似文献