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弹箭战斗部分步压装工艺技术先进性分析 总被引:1,自引:0,他引:1
分步压装工艺是一种先进的装药技术,能够装填高能炸药,装药平均密度可达到1.70g/cm^3。该技术综合了螺旋装药与油压机压装的优点,并广泛应用于大口径榴弹系列产品、火箭弹、导弹等战斗部装药。分步压装药与传统的油压机压力装药相比,具有压药过程安全、高效,相对密度高且密度均匀,具备柔性制造能力,应用广泛等先进性。分步压装药技术填补了国内弹药生产中该领域的空白,满足了我国高能固态炸药连续装药需要,实现了我国弹箭装药生产的低成本、高效率。 相似文献
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通过螺栓联接实例,分别采用中心点法,验算点法以及蒙特卡洛法对普通螺栓联接的强度进行可靠性计算,比较了各算法的误差大小,说明各算法在普通螺栓联接强度的可靠性计算中的实用性。 相似文献
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介绍了高压油水饱和实验装置的构成与工作原理、主要部件的设计计算方法等技术内容,并对贮样圆筒的塑性失效、爆破失效和压帽螺纹联接等强度和刚度的校核作了详细介绍,可作为同类高压实验装置设计与校验的参考 相似文献
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针对"某水轮发电机主轴螺栓联接仅采用传统的安全系数法设计,得出的水轮发电机主轴无垫片螺栓联接的最大应力为72.0 MPa,可靠性不高"的问题,运用ANSYS软件,建立了由精细结构和一般结构组成的主轴螺栓联接有限元模型,精细结构为对称的1/12螺栓联接结构;一般结构只模拟上/下法兰,不包含螺栓,用来传递主轴的扭转力矩;两部分之间运用约束方程联接;采用了TARGE170/CONTA174单元模拟螺栓与法兰轴接触,PREST179单元模拟螺栓预紧。计算了在额定工作状态下,有/无14.5 mm垫片的主轴螺栓联接结构应力分布。研究结果表明,有/无14.5 mm垫片两种主轴螺栓联接结构均满足强度要求;无垫片结构的螺栓最大应力为92.6 MPa,比由安全系数法得到的结果大28.61%;有垫片结构的各部件应力增大4.10%~8.55%,螺栓最大应力为96.4 MPa,比无垫片结构增大4.10%。 相似文献
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炸药具有一定的使用寿命,废旧炸药主要来源于武器战斗部厂家的废弃炸药(如药柱、熔药余料等),由于炸药具有燃烧爆炸与有毒的特征,对人类和环境都有较大的威胁,废旧炸药的回收利用一直是弹药行业的一大难题。针对炸药注装药产生的废旧炸药回收再利用遇到的破碎问题开展了技术研究。设备的核心装置为破碎箱体,破碎箱体内有形状不同的三级破碎轧辊,采用阶梯式三级轧辊破碎技术实现废旧炸药的安全自动化破碎,对其主要计算参数进行分析是该研究的重中之重,用来验证不同的转速对破碎效果及破碎效率是否有影响。研究结果表明,不同转速对破碎炸药的破碎效果没有明显区别,只是对破碎效率有一定影响。该研究对炸药破碎设备具有一定的参考价值。 相似文献
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介绍了高压油水饱和实验的构成与工作原理,主要部件的设计计算方法等技术内容,并对贮样圆筒的塑性失效,爆破失效和压帽螺纹联接等强度和刚度的校核作了详细介绍,可作为同类高压实验装置设计与校验的参考。 相似文献
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为研究装药尺寸与限定条件下炸药热起爆临界温度之间的关系,利用自行设计的烤燃试验装置,以 RDX为主的J H 炸药为试验材料,在1℃/min的升温速率下,采用恒温控制技术进行了不同温度下的烤燃试验。利用 FLUENT软件对不同装药尺寸下炸药的热起爆恒温临界温度进行了数值计算,研究了装药尺寸对炸药热起爆恒温临界温度的影响。试验结果表明,烤燃弹存在一个热起起爆恒温临界温度。仿真结果表明:当药柱的长径比相同时,随着药柱尺寸的增加,炸药的热起爆恒温临界温度逐步降低。当药柱尺寸增大到一定值时,装药尺寸对烤燃弹的热起爆恒温临界温度的影响将减弱。装药尺寸对点火点的位置无影响,均为中心点火。 相似文献
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利用工业CT技术检测弹体轴向装药均匀性以及弹壁厚度变化对测量结果的影响, 对比了同一模拟装药样件装配在不同壁厚的模拟弹体内时CT相对密度测试结果的差异, 并分析了弹壁厚度对装药CT相对密度值的影响. 结果表明, 对于弹体外径约100 mm、 内径约90 mm的样品, 弹壁厚度每增加1 mm, 同一装填材料的CT值数据随之增加约1%左右. 因此, 为检测弹体轴向(即上段、中段、下段)装药密度均匀性, 在工业CT设备穿透能力范围内, 不用测出装药的绝对密度, 只需检测上、中、下各个部位的装药CT值, 并减除弹壁厚度变化量对CT值产生的影响量, 通过比较上、中、下各个部位装药最终的CT值就可获得弹体轴向装药的密度均匀性. 相似文献
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通过对螺纹连接强度计算公式分析和实例数据,说明了标准允许的加工误差对螺纹连接强度的影响,提出了螺距选择应遵循的原则。 相似文献
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Park Jungsu Youn Sung-kie Lee Jaimin 《Journal of Mechanical Science and Technology》2017,31(12):6019-6032
Journal of Mechanical Science and Technology - To investigate the detonation characteristics of an insensitive Plastic bonded explosive (PBX), the reaction rate was obtained and used in the... 相似文献
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Swift DC Forest CA Clark DA Buttler WT Marr-Lyon M Rightley P 《The Review of scientific instruments》2007,78(6):063904
The hydrodynamic operation of the "Forest Flyer" type of explosive launching system for shock physics projectiles was investigated in detail using one and two dimensional continuum dynamics simulations. The simulations were numerically converged and insensitive to uncertainties in the material properties; they reproduced the speed of the projectile and the shape of its rear surface. The most commonly used variant, with an Al alloy case, was predicted to produce a slightly curved projectile, subjected to some shock heating and likely exhibiting some porosity from tensile damage. The curvature is caused by a shock reflected from the case; tensile damage is caused by the interaction of the Taylor wave pressure profile from the detonation wave with the free surface of the projectile. The simulations gave only an indication of tensile damage in the projectile, as damage is not understood well enough for predictions in this loading regime. The flatness can be improved by using a case of lower shock impedance, such as polymethyl methacrylate. High-impedance cases, including Al alloys but with denser materials improving the launching efficiency, can be used if designed according to the physics of oblique shock reflection, which indicates an appropriate case taper for any combination of explosive and case material. The tensile stress induced in the projectile depends on the relative thickness of the explosive, expansion gap, and projectile. The thinner the projectile with respect to the explosive, the smaller the tensile stress. Thus if the explosive is initiated with a plane wave lens, the tensile stress is lower than that for initiation with multiple detonators over a plane. The previous plane wave lens designs did, however, induce a tensile stress close to the spall strength of the projectile. The tensile stress can be reduced by changes in the component thicknesses. Experiments verifying the operation of explosively launched projectiles should attempt to measure porosity induced in the projectile: arrival time measurements are likely to be insensitive to porous regions caused by damaged or recollected material. 相似文献
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A simple but effective design to improve the strength of thick adhesive composite strap joints is validated with experiment and finite element method. The strap joint under investigation, with a particular application to naval ship structures, consists of two thick woven E-glass/vinyl ester laminates joined together with two steel doublers. Longitudinal tensile loads are applied to the joints, resulting in large concentrated shear and peel stresses near the free edges of bondlines. The new design intends to reduce the adhesive peel stress by application of through-the-thickness compressive pre-stress along the bondline and thus leads to an increase of joint strength. Experiment results show that all the joint failures are delamination of the top layer of the laminated adherends. The test further confirms that joint strength increases significantly by applying the transverse pre-stress. Finite element analysis reveals that the pre-stress can effectively reduce the magnitude even reverse the sign of the peel stress in the adhesive layer and the adherends. Recessing the adhesive leading edge could magnify the pre-stress effect and reduce the adhesive peel stress, but would increase the shear stress. For those composite joints with low transverse interlaminar strength and susceptible to delamination, this simple design/technique can considerably improve their joint strength. 相似文献
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无铅微互连焊点力学行为尺寸效应的试验及数值模拟 总被引:6,自引:2,他引:4
采用高精度微拉伸试验和有限元数值模拟方法研究不同微尺度的Sn-Ag-Cu无铅钎料模拟互连焊点力学行为和性能演变的尺寸效应。结果表明,当焊点高度恒定(225μm)而焊点直径逐渐减小(475~200μm)时,拉伸断裂强度显著提高且远高于体钎料的抗拉强度,断裂应变也逐渐增加;焊点的断裂位置及模式由较大直径时的界面低延性断裂转变为小直径时焊点中间部位的大变形颈缩断裂。模拟结果表明,由于焊点内力学拘束水平的不同,小直径焊点的界面应力较低且最大应力分布在焊点中间部分,易导致断裂发生在焊点中部,接头强度应较高;而大直径焊点中最大应力处于焊点界面,易导致界面金属间化合物层在较低外加应力下起裂,焊点断裂强度应较低。 相似文献