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Azimuthal Characteristics on Blast Wave from a Cylindrical Charge – Small Scale Experiment – 圆柱装药爆炸冲击波的方位角特性-小尺度实验-
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-9
K. Wakabayashi, T. Homae, Y. Sugitana, T. Matsumura
Azimuthal characteristics on blast wave from a cylindrical charge were experimentally investigated. A cylindrical PETN pellet, weight of 0.50 g, was detonated on a large steel plate, which is a model of the ground surface. 0°was defined as the direction of detonation, which was correspondence with the central symmetry axis of the cylindrical pellet. 12 pressure transducers were embedded in the steel plate to measure the pressure histories on the plate. The direction of the pellet and detonation was rotated every 30° and the distribution of blast pressure histories around the explosive were obtained. The peak overpressure and impulse were high in the range from 30° to 80° compared with the standard explosion data in which the explosive was placed vertically for a two-dimensional axisymmetric explosion on the steel plate and detonated from the top of the explosive. On the contrary, these blast parameters were low in the range from 90° to 130°. These blast pressures were not low in the direction of 180°. These findings are important for safety. The data will be compared with numerical simulations in future. Introduction Explosion of non-spherical explosive causes anisotropic blast wave. This anisotropic blast waves have been extensively studied for many decades. Especially, explosion of cylindrical explosive, which is relatively symmetric, have been studied both experimentally and numerically. R.A. Strehlow and W.E. Baker reviewed these studies in 1976 [1]. As the experimental technique and numerical analysis technique have been improving, many papers have been published until present [2]. It is noteworthy for safety that the blast wave in specific direction is reported to be strong in these papers. The authors carried out indoor tabletop experiments for evaluating the blast wave, using explosive of 1 g scale, and the obtained data were examined by numerical analysis. The authors reported the blast wave mitigation or distribution in a couple of systems [3-6]. In this study, the authors applied the technique above to evaluate the blast wave distribution from a cylindrical explosive precisely. The experimental system was designed under consideration for numerical analysis. Experiment Test Explosives. A PETN pellet, weight of 0.50 g, was used as a test explosive. Its length and diameter were both 7.5 mm. It contained 5 wt% of carbon for forming. A specially designed electric detonator with 100 mg lead azide was used as a detonator. Both the PETN pellet and the Explosion Shock Waves and High Strain Rate Phenomena Materials Research Forum LLC Materials Research Proceedings 13 (2019) 53-56 https://doi.org/10.21741/9781644900338-9 54 detonator were distributed by Showa Kinzoku Kogyo Co. Ltd. A spacer was used so as to the height of the center of the explosive was 0.18 m/kg.The scaled height was set up as the samescaled height of previous study [5] for comparison. The spacer was made of pasteboard and was rectangular block with the height of 10 mm and base
除上述实验外,还获得了将炸药垂直放置在钢板上进行二维轴对称爆炸,从炸药顶部起爆的标准数据进行对比。结果与讨论用样条函数拟合得到的压力曲线。然后,确定峰值超压和正比例冲量(以下简称比例冲量)。图2 (a)为峰值超压与方位角的关系。所示数据是两次实验数据的平均值。虚线为标准数据的峰值超压。图2 (a)显示了绝对值,在进一步的点上,对方位角的依赖并不容易理解。图2(b)显示了峰值超压与标准数据的比。可以清楚地看到,即使在20.4 m/kg的速度下,爆炸形状也会受到影响。与标准数据相比,峰值超压在30°至80°范围内(5.1 m/kg, 30°至60°范围内)较高。差值为10% ~ 0°θ φ7.5 PETN丸雷管180°
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引用次数: 1
Microstructural and Mechanical Properties of Al 5052-SS 316 Explosive Clads with Different Interlayer 不同夹层Al - 5052-SS - 316爆炸包壳的组织与力学性能
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-28
E. Elango, S. Saravanan, K. Raghukandan
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引用次数: 1
Shock Synthesis of Gd2Zr2O7 Gd2Zr2O7的冲击合成
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-5
T. Sekine, Q. Zhou, P. Chen, Z. Tan, H. Ran, J. Liu
We dealt with shock compression on a composition of Gd2Zr2O7 by explosive-driven flyer impact methods, because Gd2Zr2O7 with rGd/rZr ration of 1.46 lies at the structural boundary between ordered pyrochlore and defect fluorite structures. The results indicate recovered products depend on shock conditions that we need to specify by further study. Introduction Shock compression process provides unique environments for materials synthesis due to not only the realized high pressure and high temperature but also the shock-enhanced kinetics and fast quenching [1]. The process is a time-limited reaction and favors martensitic phase transformation in general. There are many trials to use shock compression techniques for investigation of solid state reactions [2]. The most typical one has been known historically as diamond synthesis, and the process has been developed to optimize the yield of products. Here we report a progress of shock synthesis of oxide compounds using explosive-driven plate impacts. Rare earth pyrochlore compounds of A2B2O7, where A is a rare earth element and B is a tetravalent cation such as Zr and Ti, exhibit several interesting properties for physical, chemical and industrial applications. The pyrochlore structure is known to form if the cation radii ratio (rA/rB) lies in the range 1.46–1.80. However, the fluorite structure is favored with rA/rB below 1.46. The cation radii ratio rA/rB has an important effect on the high pressure structural stability. Gd2Zr2O7 with rA/rB ratio of 1.46 lies at the structural boundary between ordered pyrochlore and defect fluorite. Hence it is expected to show interesting structural behavior as a function of temperature and pressure. We tried to understand the effect of shock compression on Gd2Zr2O7. Among A2B2X7 (X is anion such as O and F) compounds there are three discrete structures of pyroclore, fluorite, and weberite. Their structural relations are based on the fluorite structure (AX2) where each anion is at the center of the cation tetrahedral (A4X) and the lattice is characterized by a lattice constant of a = ~5 Å with Z=1. In pyrochlore structure, different A and B cations make A4X, B4X, and A2B2X, and the lattice is expanded double (a = ~10 Å) and the number of Z=8. Weberite consists of A3BX, AB3X, and A2B2X, with lattice constants of √2a, 2a, and √2a and with Z=4. Therefore, pyrochlore and weberite have their corresponding superlattices in addition to the fluorite structure. Shock compression technique has never been applied to solid-solid reactions in complicate chemical systems to our knowledge. We explore such chemical systems using shock compression techniques. Explosion Shock Waves and High Strain Rate Phenomena Materials Research Forum LLC Materials Research Proceedings 13 (2019) 31-34 https://doi.org/10.21741/9781644900338-5 32 Experimental methods We dealt shock compression on two starting mixtures of a composition Gd2Zr2O7 (powdered mixture of Gd2O3 + 2 ZrO2 and the product heated
由于Gd2Zr2O7的rGd/rZr比值为1.46,处于有序焦绿石和缺陷萤石结构的边界,我们采用爆炸驱动飞片冲击法对其进行了冲击压缩。结果表明,回收产物取决于冲击条件,需要进一步研究。冲击压缩工艺不仅实现了高压和高温,而且冲击增强动力学和快速淬火,为材料合成提供了独特的环境[1]。该过程是一个时效反应,一般有利于马氏体相变。有许多试验使用激波压缩技术来研究固态反应[2]。历史上最典型的一种方法是金刚石合成,该方法的发展是为了优化产品的收率。本文报道了利用爆炸驱动板冲击合成氧化物的研究进展。A2B2O7的稀土焦绿盐化合物,其中A是稀土元素,B是四价阳离子,如Zr和Ti,在物理,化学和工业应用中表现出一些有趣的性质。当阳离子半径比(rA/rB)在1.46 ~ 1.80之间时,可形成焦绿石结构。rA/rB低于1.46时,有利于萤石结构的形成。阳离子半径比rA/rB对高压结构稳定性有重要影响。Gd2Zr2O7位于有序焦绿石和缺陷萤石的结构边界,rA/rB比值为1.46。因此,它有望表现出有趣的结构行为,作为温度和压力的函数。我们试图了解冲击压缩对Gd2Zr2O7的影响。在A2B2X7 (X为阴离子,如O和F)化合物中有三种分立结构:辉石、萤石和韦伯石。它们的结构关系基于萤石结构(AX2),其中每个阴离子位于阳离子四面体(A4X)的中心,晶格的特征是晶格常数为a = ~5 Å, Z=1。在焦绿石结构中,不同的A和B阳离子形成A4X、B4X和A2B2X,晶格扩展为双晶格(A = ~10 Å), Z=8。Weberite由A3BX、AB3X和A2B2X组成,晶格常数为√2a、2a和√2a, Z=4。因此,除了萤石结构外,焦绿石和黄铁矿还具有相应的超晶格结构。据我们所知,激波压缩技术从未应用于复杂化学体系中的固-固反应。我们探索这样的化学系统使用激波压缩技术。爆炸冲击波和高应变率现象材料研究论坛LLC材料研究学报13 (2019)31-34 https://doi.org/10.21741/9781644900338-5 32实验方法我们对两种初始混合物Gd2Zr2O7 (Gd2O3 + 2 ZrO2的粉末状混合物与产品在900℃空气中加热2小时)进行冲击压缩,并将其封装在铜容器中,采用爆炸驱动飞片冲击方法[3]。一个直径为40mm,厚度为2mm的铜飞片,由8701炸药助推装药引发的硝基甲烷(CH3NO2)主爆药起爆,将其加速至高速[3]。根据已知的冲击速度,采用阻抗匹配法计算试样内反射的峰值冲击压力。用密度为8.924 g/cm的铜[4]的激波速度(Us km/s)和粒子速度(Up km/s)的关系式为Us = 3.91 + 1.51Up。根据粉末x射线衍射(XRD)分析(图1 a、B、C),在900℃下预热的起始材料(样品I)部分反应为具有单斜ZrO2的荧石结构。另一种起始材料(样品II)是Gd2O3和单斜ZrO2的混合物作为接收粉末。将注射后的容器切开,取出样品。用粉末x射线衍射法对成功回收的样品和起始原料进行了研究,以确定产品中存在的相。我们进行了一系列的恢复实验,作为冲击速度和孔隙率的函数。爆炸冲击波和高应变率现象材料研究论坛LLC材料研究学报第13期(2019)31-34 https://doi.org/10.21741/9781644900338-5 33结果和讨论我们已经开始了一系列的冲击恢复实验,对各种尚不知道的焦氯化合物,并探索新的化合物使用冲击压缩。我们报道并讨论了两种Gd2Zr2O7块体组成的结果。Cu飞片的冲击速度为1.85 km/s、2/36 km/s和3.06 km/s,峰值冲击压力分别为43.5 GPa、60.0 GPa和84.9 GPa。回收样品的XRD图谱表明,样品I完全转变为萤石结构,没有额外的峰(图1f)。
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引用次数: 0
Experimental Study for the Tenderness of Meat using Underwater Shock Waves Generation by Wire Electrical Discharges 利用导线放电产生水下冲击波对肉类嫩度的实验研究
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-6
A. Takemoto, H. Kawai, T. Watanabe, S. Itho, K. Hokamoto, Y. Higa, O. Higa, K. Shimojima, H. Iyama
High age of the population advances in the world. The consumption of meat increases. Some methods of softening of edible meat are methods such as electric energy, pressure, heating and biological. The development of the method of the tenderness that is the high efficiency which can apply to the volume of production of the meat is expected. The National Institute of Technology, Okinawa College (OkNCT) has developed a food processing machine that generates underwater shock waves through wire electrical discharge. The machine can be used for sterilization, milling, tenderness, and extraction among others. In this study, we experimentally examined the conditions for food tenderness using pork as the food material in the experiments. The relationship of the tenderness of edible meat measured with a durometer with the number of underwater shock wave generation, and the distance of the shock wave generation point from the edible meat and reflectance backing material were shown experimentally. The prototype design of the pressure vessel for the processing of the meat was shown. The possibility of designing and manufacturing of a pressure vessel according to the required tenderness was shown.
高老龄化人口在世界范围内不断发展。肉类消费增加了。可食性肉类软化的方法有电能、压力、加热和生物软化等。期望能开发出适用于肉制品批量生产的高效嫩化方法。日本冲绳县国立理工大学(OkNCT)开发出了一种通过电线放电产生水下冲击波的食品加工机器。该机可用于灭菌、研磨、柔嫩、提取等。在本研究中,我们在实验中以猪肉为食材,对食物嫩度的条件进行了实验研究。实验证明了用硬度计测量的食用肉的嫩度与水下激波产生次数、激波产生点与食用肉的距离和反射率背衬材料的距离之间的关系。展示了加工肉用压力容器的原型设计。指出了按压度要求设计和制造压力容器的可能性。
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引用次数: 4
Development of Weldability Window for Aluminum-Steel Explosive Cladding 铝-钢爆炸覆层可焊性窗口的研制
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-26
K. Hokamoto, G. Murugan, S. Saravanan, K. Raghukandan, S. Tanaka
This study addresses the development of biaxial and triaxial weldability windowan analytical estimation-for determining the nature of interface in aluminum 5052-stainless steel 304 dissimilar explosive cladding. The lower and upper boundaries of the biaxial weldability window are formulated using empirical relations proposed by earlier researchers. The process parameters dynamic bend angle and collision velocity are chosen as ordinates and abscissa respectively. In addition, a triaxial weldability window, comprising of three process parameters viz., flyer plate velocity, collision velocity and dynamic bend angle is also developed. Explosive cladding experiments were conducted by varying the process parameters and the interface microstructure is correlated with the developed weldability windows.
为确定5052铝合金- 304不锈钢异种爆炸熔覆层界面性质,研究了双轴和三轴可焊性窗口的发展。双轴可焊性窗口的上下边界采用早期研究者提出的经验关系式来表示。以动态弯曲角和碰撞速度为纵坐标和横坐标。此外,还建立了由飞片速度、碰撞速度和动态弯曲角三个工艺参数组成的三轴可焊性窗口。通过改变工艺参数进行了爆炸熔覆实验,界面显微组织与所开发的可焊性窗口相关。
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引用次数: 1
High Strain Rate Behaviour of Auxetic Cellular Structures 失活细胞结构的高应变速率行为
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-4
N. Novak, Z. Ren, Pengwan Chen, B. Guo, K. Hokamoto, M. Vesenjak, Shigeru Tanaka
Auxetic cellular structures are modern metamaterials with negative Poisson’s ratio. The auxetic cellular structures build from inverted tetrapods were fabricated and experimentally tested under dynamic loading conditions to evaluate the effect of strain rate on their deformation mode. The Split-Hopkinson Pressure Bar (SHPB) apparatus was used for testing at strain rates up to 1,250 s, while a powder gun was used for testing at strain rates up to 5,000 s. The homogeneous deformation mode was observed at lower strain rates, while shock deformation mode was predominant at higher rates. The results have shown that the strain rate hardening of analysed auxetic specimens is prominent at higher strain rates when the shock deformation mode is observed, i.e. when most of deformation occurs at the impact front. Relevant computational models in LS-DYNA were developed and validated. A very good correlation between the computational and experimental data was observed. Introduction Auxetic cellular structures are novel metamaterials with negative Poisson’s ratio – they tend to expand in lateral direction when subjected to tensile loading and vice versa in the case of compression loading [1]. This behaviour can be beneficial in many applications, especially in the crashworthiness, ballistic protection and energy absorption applications [2]. The mechanical behaviour of auxetic structures is well characterised and understood for quasi-static loading conditions, but not so much for dynamic and impact loading due to insufficient experimental characterisation attempts so far. Past studies were mostly concerned with the quasi-static elastic behaviour of uniform auxetic structures at very small strains [3] and limited ballistic resistance study [4]. Mechanical behaviour of some particular auxetic structures was characterised by uniaxial quasi-static compressive and tensile tests [5–10]. The Split-Hopkinson Pressure Bar (SHPB) experiments were also carried out for auxetic cellular structures fabricated with additive manufacturing, including also polymer fillers [11]. There is a clear need to test the auxetic cellular structures also under high strain rate loading conditions to comprehensively evaluate their behaviour also at highly dynamic loading. Especially since there are many applications where these metamaterials can be used efficiently. Explosion Shock Waves and High Strain Rate Phenomena Materials Research Forum LLC Materials Research Proceedings 13 (2019) 25-30 https://doi.org/10.21741/9781644900338-4 26 Specimens fabrication The specimens build from inverted tetrapods were used in this research. Inverted tetrapods (Fig. 1a), are assembled in a particular way to define the geometry of the investigated specimens (Fig. 1b-c). The specimen’s inverted tetrapod dimensions were (Fig. 1a): a = 3.5 mm, h = 3 mm, dh = 0.5 mm, while the circular cross-section diameter of the struts was in range from 0.38 to 0.53, depending on the porosity (Table 1). Two types of specimen
生长型细胞结构是具有负泊松比的现代超材料。在动加载条件下,制备了由倒四足动物构建的异形胞状结构,并进行了实验测试,以评估应变速率对其变形模式的影响。Split-Hopkinson压力棒(SHPB)装置用于应变速率高达1,250 s的测试,而粉末枪用于应变速率高达5,000 s的测试。在较低应变速率下观察到均匀变形模式,而在较高应变速率下则以冲击变形模式为主。结果表明,当观察到冲击变形模式时,即当大部分变形发生在冲击前沿时,在较高的应变速率下,所分析的失活试样的应变速率硬化是显著的。建立了LS-DYNA的相关计算模型并进行了验证。计算数据和实验数据之间有很好的相关性。补体细胞结构是一种具有负泊松比的新型超材料,它们在拉伸载荷下倾向于横向膨胀,而在压缩载荷下则相反[1]。这种行为在许多应用中都是有益的,特别是在耐撞性、弹道保护和能量吸收应用中[2]。在准静态加载条件下,减振结构的力学行为得到了很好的表征和理解,但由于迄今为止实验表征尝试不足,对动态和冲击加载的力学行为还不是很清楚。以往的研究多集中于均匀形变结构在非常小应变下的准静弹性行为[3]和有限弹道阻力研究[4]。通过单轴准静态压缩和拉伸试验表征了一些特殊的形变结构的力学行为[5-10]。劈裂-霍普金森压力棒(Split-Hopkinson Pressure Bar, SHPB)实验也对增材制造制造的增塑型细胞结构进行了实验,包括聚合物填料[11]。显然,有必要在高应变率加载条件下对失活细胞结构进行测试,以全面评估其在高动态加载下的性能。特别是因为有许多应用,这些超材料可以有效地利用。爆炸冲击波与高应变率现象材料研究论坛LLC材料研究学报第13期(2019)25-30 https://doi.org/10.21741/9781644900338-4 26样品制备本研究采用倒立四足动物标本。倒置四足动物(图1a),以特定的方式组装以定义所研究标本的几何形状(图1b-c)。试件的倒四足尺寸为(图1a): a = 3.5 mm, h = 3 mm, dh = 0.5 mm,而支撑的圆形截面直径范围为0.38至0.53,取决于孔隙率(表1)。在这项工作中分析了两种类型的试件:a)短试件和b)长试件。各分析类型试样在X2方向上的长度差异(表1)。试样由Ti-6Al-4V合金粉末在德国erlangen - n rnberg大学材料科学与技术研究所(WTM)采用选择性电子束熔化法(SEBM)制备[12]。图1:由倒立四足动物构建的补体标本的几何形状:a)倒立四足动物,b)正交视图的几何形状,c)预制标本样本数据短标本尺寸(毫米)| X1 |×| X2 |×| X3 |质量(std. dev) [g]密度(g / cm)孔隙度p[-]中等孔隙度15.6×19.2×18.7 - 3.45(0.023)0.62 - 0.86长标本尺寸(毫米)| X1 |×| X2 |×| X3 |质量(std. dev) [g]密度(g / cm)孔隙度p[-]高孔隙度15.6×40.5×18.7 - 4.67(0.138)0.40 - 0.91中等孔隙度7.24(0.051)(0.075)0.76 0.83 9.04 0.61 - 0.86低孔隙度高应变率实验测试高应变率进行了实验测试使用两种不同的实验装置:a)北京理工大学爆炸科学与技术国家重点实验室的分离式霍普金森压力棒(SHPB)装置,中国北京;b)日本熊本大学脉冲功率科学研究所的粉末枪。使用SHPB和火药枪的加载速度分别为25 m/s和220 m/s。加载速度对应的应变速率,短试件为1,250 s,长试件为10,000 s,长试件为5,000 s。在火药枪实验中,机械响应用PVDF计(压电薄膜应力计,PVF2 11125EK, Dynasen)进行评估,如Tanaka等人先前的实验所述[13]。一个齐次的h
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引用次数: 0
Effect of Pre-Notch on Deformation of Aluminium Square Plate under Free Blast Loading 预缺口对自由爆炸载荷下铝方板变形的影响
Pub Date : 1900-01-01 DOI: 10.21741/9781644900338-19
Q. Zhou, A. Arab, Y. Guo
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引用次数: 0
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Explosion Shock Waves and High Strain Rate Phenomena
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