大开孔聚能装药威力性能研究

为了实现聚能装药大开孔威力要求,针对典型钢靶和混凝土目标,对3种不同结构的聚能装药展开研究。数值模拟研究了紫铜、钛合金、铝/钛3种球缺罩的杆式射流成型、开孔及侵彻威力性能;通过静破甲试验对不同结构聚能装药开孔及侵彻威力进行测试和分析。数值模拟结果表明:内/外罩材料为铝/钛时,开孔威力较钛合金罩、紫铜罩有明显提高,其侵彻威力较钛合金罩有所提高,紫铜罩的开孔威力相对最差。静破甲试验结果表明:铝/钛复合杆式射流对45#钢靶及C35钢筋混凝土的开孔孔径较钛合金、紫铜杆式射流有明显提高,其主要原因是低熔点钛、铝的高温气化效应及与靶板介质在熔融状态下发生脆性化学反应,导致靶板抗侵彻强度降低。     

变壁厚球缺罩杆式射流的形成与侵彻性能研究?

为了研究不同结构对变壁厚球缺罩形成杆式射流的影响,设计了等壁厚、中间厚边缘薄、中间薄边缘厚3种等质量球缺罩方案。利用LS-DYNA软件对杆式射流的形成与侵彻进行了数值模拟,并进行了大炸高下的侵彻试验。研究结果表明:结构不同导致形成杆式射流的方式不同,并对射流的形态与速度分布有显著影响;中间厚边缘薄球缺罩形成的杆式射流侵彻深度最大,等壁厚球缺罩次之,中间薄边缘厚球缺罩最差。     

等壁厚球缺形装药结构优化设计?

针对串联战斗部前级装药兼顾侵深与开孔的要求,采用正交试验的极差分析方法,结合射流成型及侵彻钢靶的数值仿真结果,分析药型罩结构参数对于杆式射流侵彻性能指标影响的主次顺序,发现当相对壁厚值为3.4%时,侵彻深度达到最大。找到了一定侵彻深度条件下(1.7D),开孔能力最佳的等壁厚球缺罩结构参数的最佳组合(h=0.045D,r_1=0.579D)。简单提出了等壁厚球缺罩的设计方法,并进行了侵彻钢靶的静爆试验。数值模拟结果与试验结果吻合较好。研究结果为聚能装药技术的进一步研究提供了参考依据。     

炸高对侵彻效应影响试验和数值模拟研究

为了研究炸高因素对聚能装药侵彻深度影响,文章建立了柱锥结合罩型聚能装药侵彻靶板仿真计算模型,研究了不同炸高条件下射流侵彻45#钢靶板的作用过程,并与试验结果进行了对比分析。结果表明,试验与数值模拟结果较吻合;柱锥结合罩型聚能装药的有利炸高与装药直径之比为1.4～1.8,最大破甲深度约为装药直径的4.6倍。     

复合材质杆式射流侵彻水下目标的数值模拟

为了实现聚能战斗部对水下目标的高效毁伤,在传统聚能战斗部的基础上设计了一种采用不同材料的球缺罩与偏心亚半球形罩组合的聚能战斗部。阐述了复合材质组合式聚能战斗部的结构设计及作用原理,利用有限元软件AUTODYN数值模拟了其成型及侵彻水下靶板的过程,并与传统的偏心亚半球缺式和单一材质组合式战斗部的毁伤效果进行了对比。研究表明,复合材质组合式战斗部形成的前级杆式射流侵彻水介质过程中可以为后级杆式射流开辟无耗能通道;在相同炸高下,侵彻相同厚度的水介质与靶板后,与传统杆式射流相比,复合材质杆式射流的动能衰减率最小,剩余动能提升了28.59%。该复合材质组合式聚能战斗部可以实现对水下目标的高效毁伤。     

炸高对侵彻效应影响试验和数值模拟研究

为了研究炸高因素对爆炸成型弹丸(EFP)成型性能及侵彻深度的影响,利用有限元软件LSDYNA,建立了球缺罩型聚能装药仿真计算模型。研究了十种不同炸高条件下,EFP着靶时性能参数和侵彻45#钢靶过程,并与该装药静破甲试验结果进行了对比分析。结果表明:试验与数值模拟结果较吻合,最大误差为10%,EFP装药的有利炸高与装药直径之比为3.9~4.4,最大破甲深度约为装药直径的0.92倍。     

铝铜厚度比对复合药型罩侵彻能力影响的计算研究

为了将复合聚能罩从兵工领域引入到民用爆破工程,基于工业用火工品特点,研究了材料廉价易得、制作工艺简单的定厚度比铝铜双层复合药型罩。制作时,在炸药与铜罩(内层罩)之间配置一层阻抗低于铜的铝罩(外层罩),便能提高炸药能量利用率。通过数值模拟计算了不同铝铜厚度比射流的侵彻过程,发现射流头部速度随铝铜厚度比提升而增加,而侵彻深度随铝铜厚度比的增加呈先增后降的趋势,铝铜厚度比为3时获得最佳侵彻深度。铝铜厚度比小于5时,侵彻孔径变化较小。     

铝铜厚度比对复合药型罩侵彻能力影响的计算研究

为了将复合聚能罩从兵工领域引入到民用爆破工程,基于工业用火工品特点,研究了材料廉价易得、制作工艺简单的定厚度比铝铜双层复合药型罩。制作时,在炸药与铜罩(内层罩)之间配置一层阻抗低于铜的铝罩(外层罩),便能提高炸药能量利用率。通过数值模拟计算了不同铝铜厚度比射流的侵彻过程,发现射流头部速度随铝铜厚度比提升而增加,而侵彻深度随铝铜厚度比的增加呈先增后降的趋势,铝铜厚度比为3时获得最佳侵彻深度。铝铜厚度比小于5时,侵彻孔径变化较小。     

分层对TC4钛合金板抗平头弹撞击失效特性的影响

使用Abaqus/Explicit有限元分析软件,开展平头弹撞击不同厚度双层TC4钛合金板数值模拟,研究双层TC4钛合金板撞击失效特性与失效模式随厚度变化规律及机理。通过对比撞击试验与仿真结果,验证数值模型和参数的有效性。在此基础上与等厚度单层TC4钛合金板的抗侵彻性能进行对比,结果表明,对于12.68 mm直径的平头弹,在靶板厚度2~16 mm内,双层结构的弹道极限与总厚度近似呈线性关系。由于单层靶板在4~10 mm内随着厚度增加,弹道极限无明显变化,所以等厚接触式双层结构在该厚度范围相比单层靶有明显的优势。在总厚度为8 mm时,双层靶优势最为明显,弹道极限相比单层靶提高了43%左右。     

截顶辅助药型罩对椭球罩射流成型影响研究

为了研究截顶辅助药型罩的结构参数对椭球罩射流成型及侵彻性能的影响,运用仿真软件Autodyn-2D的Euler算法对其有限元模型进行数值模拟计算.结果表明:当辅助药型罩高度为2.5mm,直径为15mm时,截顶椭球罩形成的杆式射流具有最优的形态及侵彻性能,使用优化后的辅助药型罩结构侵彻混凝土靶板时,头部速度提升23.9％...     

粉末药型罩石油射孔弹侵彻性能的数值模拟

根据石油射孔弹的实际结构和几何尺寸,运用ANSYS/LS-DYNA2D非线性动力学有限元分析软件,基于自适应网格方法,对孔隙率为11.53%的铜药型罩射流形成和打靶过程以及聚能射流头部速度进行详细描述和分析,并对密实铜药型罩射流形成及打靶的过程进行了数值模拟。对比分析粉末药型罩和密实药型罩侵彻靶板的形貌,结果表明:孔隙率为11.53%的药型罩打靶在穿深、孔径两方面均表现出了更好的侵彻特性。     

Analysis of the aluminum alloy resistance to the penetration of a steel rod at impact velocities of up to 500 m/s

The penetration of a steel rod into aluminum alloy plates of various thicknesses is examined. The resistance to penetration at its initial stages prior to the rod fracture is found to be determined by the dynamic strength of the plate material, its viscous component (proportional to the plastic strain rate) prevailing at impact velocities of up to 500 m/s. The depth of penetration varies with the velocity and is conditioned by wave processes in the plate, their scale being dependent on its thickness. Institute for Problems of Strength, National Academy of Sciences of Ukraine, Kiev, Ukraine. Translated from Problemy Prochnosti, No. 5, pp. 106–110, September–October, 1998.     

High-speed penetration of a thin plate into a metal strip

The article presents experimental data on the penetration of a thin copper plate into a strip of steel and titanium alloy. It shows The effect of the width of the strip on the depth of penetration connected with the effect of unloading waves from the lateral surfaces of the strip and the nucleation of a crack at the bottom of the formed crater.Translated from Problemy Prochnosti, No. 8, pp. 45–48, August, 1992.     

Study on continuous casting of bulk metallic glass

Continuous casting method for massive production of steel, aluminum, copper or other crystalline alloy ingot is a very important industrial technology for its low energy consumption and high productivity. In this study, a new continuous casting method was developed for the massive production of bulk metallic glass ingot with centimeter-scale diameter without length limitation. An intermittent withdrawal procedure was practiced for continuous casting of bulk glassy alloy. The new developed continuous casting method can provide a cooling speed as high as that provided by the stationary mold casting method. A Zr-based glassy alloy rod with a diameter of about 10 mm and length of tens of centimeters was prepared by the continuous casting method for the first time.     

Penetration of semi-infinite AD995 alumina targets by tungsten long rod penetrators from 1.5 to 3.5 km/s

The performance of confined AD995 Alumina against L/D 20 tungsten long rod penetrators was characterized through reverse ballistic testing. The semi-infinite ceramic target was cylindrical with a diameter approximately 30 times the rod diameter. The target configuration included a titanium confinement tube and a thick, aluminum coverplate. The impact conditions ranged from 1.5 to 3.5 km/s with three or four tests performed at each of six nominal impact velocities. Multiple radiographs obtained during the penetration process allowed measurement of the penetration velocity into the ceramic and the consumption velocity, or erosion rate, of the penetrator. The final depth of penetration was also measured.

Primary penetration approaches 75% of the hydrodynamic limit. Secondary penetration is very small, even at 3.5 km/s. The effective R_t value decreased from 90 kbar to 70 kbar with increasing impact velocity over the range of velocities tested.

In tests in which the ratio of target diameter to penetrator diameter was reduced to 15, R_t, dropped by 30% to 50%. When a steel coverplate was used, total interface defeat occurred at 1.5 km/s.     

整体串联药型罩前后级壁厚对射流的影响研究

本文采用数值仿真与试验研究相结合的研究方法.为进一步提高药型罩有效射流量以及侵彻钢靶的深度,设计了三种药型罩不同前后级壁厚匹配方式的串联装药结构,并利用有限元软件LS-DYNA对药型罩不同前后级壁厚的串联装药结构射流的成形以及对钢靶的侵彻过程进行了数值模拟研究;配以相应的炸药装药进行试验研究,并对两种研究结果进行了简要的分析.结果表明,药型罩前后壁厚比为0.05 mm∶0.1 mm的装药结构要比其它壁厚比的装药结构形成的射流头部速度更高,侵彻钢靶更深,而且数值模拟与试验研究所得结论基本吻合.