搜索
您的当前位置:首页正文

X光机

来源:尚车旅游网
维普资讯 http://www.cqvip.com 第4期 赵跃堂等:饱和土中爆炸波传播问题的数值模拟 357 Numerical simulation of explosion wave propagation in the saturated soil ZHAO Yue—tang。,LIANG Hui,FAN Bin (Engineering Institute of PLAUST,Jiangsu,Nanjing 210007,Jiangsu,China) Abstract:The constitutive model was described based on the theory formwork of elastic-plastic hydro— dynamics for saturated soil under the explosive loading,including the relation of pressure and volu— metric strain and the relation of pressure and failure surface.The explosion wave propagation and the interaction between media and structure were simulated numerically by using LS-dyna software,the results of numerical simulation is in close agreement with that of foregone experimental investigation. The reappearance of some special phenomena for saturated soil makes clear that the constitutive model iS usable. Key words:mechanics of explosion;constitutive relation;numerical simulation;saturated soil;explo— sion wave X光机 x射线具有穿透物质不被折射和反射,不受电场、磁场的影响,而按直线传输和按一定规律衰减的特性,已广泛地应 用在医疗卫生、工业生产、科学研究、武器研制、国防建设、航天工程等各领域无损探伤、诊断,以达到质量控制的目的;对 具有瞬变特性的高速运动现象进行观测和研究。 作为我院爆轰物理研究的需要,我们先后研制成功x.I型、x-Ⅱ型、x.Ⅲ型脉冲X光机和x.V型软管x光机。 x-Ⅲ型机采用同轴结构方式,选用低感电容元件储能,Max发生器直接产生ns高压脉冲加到二极管上产生rls宽度 x射线,具有闪光时间短、焦点小、性能稳定、操作简单,主机体积小、重量轻、移动方便及触发控制记录仪器柜式化。在 爆轰物理研究中观测不透明介质的内部结构、探伤等方面获得理想的效果,是国内同类型机种的先进设备,已在国内总 参工程兵研究所等重要的科研单位得到推广应用,1997年《i.5 Mev/40 ns脉冲x射线实验装置研究和应用》荣获国防 科工委科技进步三等奖。 x-Ⅲ型脉冲x光机主要性能指标标称电压:1.5 MV)标称储能:0.5 KJ;脉冲宽度:<4O ns;焦点直径:3、5、6 mm 任选;1 m处剂量:2.32×10一c/kg;2.5 m处穿透钢能力:30 ̄40 mm!时间抖动:<0.2 bts。 X—V型软管x光机为系列闪光x射线机的一种,在与其技术性能相适应的范围内完成有关的实验研究工作和开 拓新的应用领域。 X光管与Max发生器通过高压电缆连接,可方便移动位置。x光管电压:300 kV;脉宽:40 ns;焦斑:j2『4 mm;剂量 (38 cm处):48 mR/pulse;穿透(2.5 m处):穿透38 mm铝。 在武器研制中,闪光x射线测试技术与光学测试技术、电子学测试技术成为相辅相成测试手段。 脉冲x光照像技术是对各种爆炸过程和其他快速过程进行x光瞬问照像的技术。即可拍摄爆炸过程中的高速变 化现象和不透明物体内部的变化过程,可应用于弹道过程聚能射流侵彻、炸药爆轰、破甲与防护、高速碰撞等爆炸力学的 研究。 x.V型X光机和x光管样品见363页;X-Ⅲ型机控制台和x.Ⅲ型机样品见363页。 (转363,379页) (中国工程物理研究院流体物理研究所提供) ・Corresponding author:ZHAO Yue-tang E-mail address;yuetangzh@163.corn Telephone:86-25-8082 1045 维普资讯 http://www.cqvip.com 第4期 姜锡权等:改进的霍普金森压杆技术在聚氨脂泡沫塑料动态力学性能研究中的应用 363 chanics,2002,39:8l . [4]王礼立.应力波基础[M].第二版.北京:国防工业出版社,2005:52・60- [5]Kolsky H.An investigation of mechanical properties of materials at Vcry high rates of loading[J].Proceedings of the Physical Society。1949(B),62:676-700. [6] Chen w,Lu F,Frew D J,et a1.Dynamic compression testing of soft materials[J].Journal of Applied Mechanics, 2002(B),69:214—223. Application of modified split Hopkinson pressure bar techanique in the study of dynamic behavior of a polyurethane foam JIANG Xi—quan ' ,TAO Jie ,WANG Yu—zhi (1.ArtilleryAcademy,Hefe 510632,Anhui,China; 2.University of Science and Technology of China,Hefei 230026,Anhui,China) Abstract:The experimental technique of split Hopkinson pressure bar is an effective method to carry out an experiment in study of the dynamic behavior of materials.But some problems such as non—uni— form dynamic stress in a specimen and non-constant strain rate during the experiment may arise if the techniaue isn’t modified.Polyurethane foams have been widely used in civilian and military areas.It is more important to study their mechanical behavior,especially,dynamic behavior.The dynamic be— haviors of a polyurethane foam under the conditions of uniform stress in the specimen and constant strain rate were detained experimentally with modified spilt Hopkinson pressure bar technique. Key words:solid machanics;dynamic behavior;SHPB;polyurethane foam;uniform dynamic stress+ pulse shaper;constant strain rate (接357页) x-V型X光机 X光管 (转379页) (中国工程物理研究院流体物理研究所提供) Corresponding author:JIANG Xi’quan E-mail address:xiquanjiang@yahoo.com.cn Telephone..86・・551-’5768183 维普资讯 http://www.cqvip.com 第4期 章文义等:防爆硝酸铵抗爆性能检测用标准雷管研究 379 TANG Shuang—ling.LU Chun-xu,ZHOU Xin-li,at a1.Studies on the detonation safety of modified ammonium ni— trate I:The influence of inorganic chemical fertilizer[J].Chinese Journal of Applied Chemistry,2004,2 1(1):64— 68. [4]唐双凌,刘祖亮,周新利,等.改性硝酸铵爆轰安全性研究lI:CaCOs和MgCO。对硝酸铵爆轰安全性的影响[J].应 用化学.2004.21(4):400—404. TANG Shuang—ling.LIU Zuliang,ZHOU Xin-li,at a1.Detonation safety of modified ammonium nitrate lI:The inf1uences of calcium carbonate and magnesium sulfate[J].Chinese Journal of Applied Chemistry,2004,21(4): 400—4O4 Research on standard detonator for testing of non—explosive AN ZHANG Wen—yi ,ZHU Shun—guan ,WANG Zhi—rain ,LIU Da—bin (1.The School of Chemical Engineering,Nanjing University of Science and Technology, Nanjing 210094,Jiangsu,China; 2.China National Supervision Testing Center for Industrial Explosive Material, Nanjing 210094,Jiangsu,China) Abstract:It is necessary to give a testing standard for measuring the non—explosion farm AN.A new kind of standard detonator was designed to ensure the coherence of testing results.The obtained re— suIts show that the out—put of the standard detonator is larger than that of 8 industry detonator,and the tested results is equable.The standard detonator corresponds with the requirements. Key words:mechanics of explosion;standard electric detonator;determination;ammonium nitrat,e; detonation resi stance (接357,363页) x.Ⅲ型机控制台 x_Ⅲ型机 (中国工程物理研究院流体物理研究所提供) ・Corresponding author:LIU Da—bin E-mail address:LDB1963@vip.sina.corn Telephone:86 25—84314928 

因篇幅问题不能全部显示,请点此查看更多更全内容

Top