炸药和雷管同载运输车的研究

文中介绍了炸药，雷管同载运输车及其核心部分夹套式抗爆容器的结构，设计原理，计算方法和主要性能。试验表明：同载运输车能保证炸药，雷管同车运输的安全，从而证明研究的设计是正确的。这种方法也可和于其它抗爆容器或结构物的设计。     

汽油抗爆剂的研究现状和发展方向

阐述了国内外汽油抗爆剂的研究进展,介绍了现有抗爆剂的爆震机理.强调了在抗爆剂研究和开发中要重视国内外在相关领域研究中所取得的经验与教训,弄清燃烧过程的微观机理,了解抗爆剂在燃烧过程中阻断爆震的机理及抓住解决爆震的主要矛盾.指出了目前抗爆剂研究中存在的问题,并探讨了今后汽油抗爆剂的发展方向.     

地铁地下结构内爆炸防护问题研究

地铁地下结构作为重要的生命线工程,进行抗爆设计具有重要的意义,而我国在地铁地下结构应对突发性爆炸的防护技术方面研究起步晚,基础薄弱.在参考国内外地铁地下结构抗爆设计研究成果的基础上,阐述了需要亟待解决的四个问题:炸药爆炸当量估算方法和设防标准的确定,地铁地下结构内冲击波流场的研究,地铁地下结构内爆炸破坏效应模型建立及人员伤亡效应评估,地铁地下结构的抗爆设计和抗爆加固设计技术措施研究.这些问题的研究和解决将对新建地铁地下结构的抗爆没计和现有地铁结构抗爆加固技术措施提供坚实的理论基础.     

换流变压器阀厅抗爆门抗冲击性能实验研究

抗爆门作为换流变压器阀厅的重要安全防护设施,有着很高的质量要求,因此对阀厅抗爆门的抗冲击性能研究具有很大的实用价值.主要对300 kPa和1000 kPa冲击波超压载荷工况下,有泡沫铝填充和无填充的抗爆门抗爆性能进行实验研究,验证抗爆门的抗冲击性,并通过门扇形变量对两种不同材质抗爆门的抗爆性能进行对比评估.实验结果表明...     

钢板-泡沫金属-钢板叠合结构抗爆机理初探

试验表明钢板-泡沫金属-钢板叠合成的三明治结构具有良好的抗爆性能.对该结构抗爆机理进行分析,指出波的反射、散射、干涉所引起的边界效应、会聚效应是其抗爆性能得到提高的主要原因,为该结构的推广应用提供了理论支持.     

磁流变阻尼器抗爆隔震性能的数值模拟

磁流变阻尼器隔震系统具有隔震效率高、能耗低、可控性好等优点,但针对抗爆结构隔震的研究还很少。本文针对抗爆结构的隔震特点,提出了阶跃电流控制方法,采用改进的Bouc-Wen模型和Matlab Simulink模拟软件,对磁流变阻尼器的抗爆隔震性能进行了模拟分析。结果表明,磁流变阻尼器可以有效改善抗爆结构的位移、加速度和VDV值的响应,与模糊控制方法相比,阶跃电流控制方法更适合于抗爆结构的隔震控制。     

气云爆炸条件下消防炮的抗爆性能研究

以换流变压器站变压器燃爆防控及消防应用为背景,针对变压器在失控条件下可能发生的燃爆事故,通过设计模拟试验,完成变压器燃爆事故的模拟。进而对现有消防设备消防炮的功能可靠性和抗爆性能进行验证。结果发现,在高温、高压的气云爆炸火球范围内,消防炮的抗爆性能无法满足实际需要,在变压器爆炸后存在功能损失的情况。发现了消防炮自身的抗爆薄弱环节,提出了消防炮抗爆设计及安装改进建议。可为换流变压器站的抗爆型消防炮设计提供基础数据参考。     

冲击载荷作用下机身壁板破坏效应及结构优化EI北大核心CSCD

研究非包容抗爆结构约束下,冲击波和端头两种冲击载荷对机身壁板的破坏效应。以定向非包容抗爆结构冲击位置处机身壁板为研究对象,通过有限元数值模拟,分析了在非包容抗爆结构约束下冲击波和端头两种载荷作用于不同位置时,机身壁板的破坏模式和程度,并以限制机身壁板破坏范围为目的,对冲击位置处机身壁板进行了结构优化。结果表明:在冲击波作用下机身壁板的主要破坏模式为蒙皮剪切冲塞、沿筋和垂直于筋撕裂以及筋条断裂,在端头作用下则为蒙皮沿筋和垂直于筋撕裂以及筋条断裂;冲击位置对端头载荷作用下机身壁板的破坏程度影响较冲击波明显;端头冲击筋条位置对机身壁板的整体破坏程度较小,为较优的冲击方案;垂直加筋对两种冲击模式下机身壁板的破口扩展均有明显约束效果,但对端头作用下的约束效果更佳,端头冲击筋间或筋条位置时,增加垂直加筋壁板损伤面积分别减小了56%和39%。研究结果可为民机用非包容抗爆容器结构设计及冲击位置处机身壁板结构设计提供指导。     

链枷式排爆装置抗爆性能的仿真与试验研究

为了探究链枷式排爆装置的抗爆性能是否满足作业需求,以ANSYS软件为技术平台,建立了该排爆装置抗爆性能的仿真计算模型。依托该模型,对不同TNT当量、不同爆炸位置等多种工况下排爆装置的抗爆性能进行了分析,得到其结构变形量和速度特性。同时,搭建了链枷式排爆装置的抗爆性能试验台架,通过台架试验验证了仿真模型的可信性,为排爆装置抗爆性能分析评价与结构优化设计提供参考。     

结构抗爆防护措施经济决策模型

为给结构抗恐怖爆炸袭击防护提供经济决策支持,达到防护性能和经济性的最佳平衡,该文首先在分析土地费用及抗爆防护措施费用与安全距离之间关系的基础上,建立结构抗爆防护措施的经济决策模型。然后,基于实际工程抗爆防护措施的费用数据,采用信赖域优化算法确定了预测模型的关键参数。最后,以实际工程为例,对所建立的预测模型进行有效性验证,结果表明,所建立的预测模型可以简便、有效地进行结构抗爆防护措施的经济决策分析,从而为抗爆安全风险评估及管理决策提供依据。     

玻纤表面动态润湿行为

提出了采用线性回归处理分析玻纤与浸润液体动态润湿的新方法,结合高精度电子天平,表征了玻纤表面动态润湿性能。研究结果表明：在玻纤表面动态润湿过程中,随着润湿速度的增加,动态接触角有增大的趋势,玻纤与去离子水、乙二醇、760E环氧、CYD128环氧的接触角分别由66.04°、42.21°、51.31°、73.90°增加到69.05°、46.95°、74.58°、170.06°,玻纤表面可润湿性能下降。玻纤表面动态润湿过程中,黏度越大,随着润湿速度增加,可润湿性能下降越快,即玻纤与CYD128环氧体系的接触角下降96.16°,而与760E环氧树脂和乙二醇的接触角下降分别为23.27°和4.74°。基于新方法的玻纤表面动态润湿系统中,玻纤所受作用力随三相接触线移动速率和浸润液体黏度的增加而增大。     

Microwave diagnosis of low-density fiberglass composites with resin binder

Dielectric properties of low-density fiberglass composites are studied at microwave frequencies and are related to the resin binder content and state of cure. A completely filled short-circuited waveguide method is used to study the dielectric properties of fresh and slightly cured resin binder (used in the production of low-density fiberglass composite materials) in the frequency range of 4–18 GHz. The preliminary results indicate that the dielectric properties of resin binder may be used to determine its state of cure. The same measurement approach is used to determine the dielectric properties of fiberglass materials containing uncured resin binder, no resin binder, and three different levels of resin binder. It is found that the dielectric properties of these low-permittivity and low-loss materials are very similar. Consequently, to distinguish among real fiberglass products with different resin binder levels, an open-ended rectangular waveguide measurement approach, is used. This technique allows for noncontact and on-line inspection. The standoff distance is utilized as an optimization parameter increasing the sensitivity of detection to slight dielectric property variations. Two microwave images, at 24 and 10 GHz of a panel containing five different fiberglass specimens are presented.     

Microwave Diagnosis of Low-Density Fiberglass Composites with Resin Binder

Abstract

Dielectric properties of low-density fiberglass composites are studied at microwave frequencies and are related to the resin binder content and state of cure. A completely filled short-circuited waveguide method is used to study the dielectric properties of fresh and slightly cured resin binder (used in the production of low-density fiberglass composite materials) in the frequency range of 4–18 GHz. The preliminary results indicate that the dielectric properties of resin binder may be used to determine its state of cure. The same measurement approach is used to determine the dielectric properties of fiberglass materials containing uncured resin binder, no resin binder, and three different levels of resin binder. It is found that the dielectric properties of these low-permittivity and low-loss materials are very similar. Consequently, to distinguish among real fiberglass products with different resin binder levels, an open-ended rectangular waveguide measurement approach is used. This technique allows for noncontact and on-line inspection. The standoff distance is utilized as an optimization parameter increasing the sensitivity of detection to slight dielectric property variations. Two microwave images at 24 and 10 GHz of a panel containing five different fiberglass specimens are presented.     

4种改性聚苯硫醚贮存寿命热老化试验研究

对不同颜色(黑色和本色),长玻纤和碳纤增强、增韧增强改性聚苯硫醚进行了热空气老化试验研究,通过选择拉伸性能下降超过30%作为贮存寿命判据,预测40%长碳纤增强聚苯硫醚(黑色)、40%长玻纤增强聚苯硫醚(本色)、40%长玻纤增韧增强聚苯硫醚(黑色),40%长玻纤PA66增强聚苯硫醚(黑色)贮存寿命分别为32.4、55.5、23.8和60.3年,适宜在武器装备上推广使用     

Preform permeability variation with porosity of fiberglass and carbon mats

An experimental investigation on fiber bed permeability variation with porosity for three types of reinforcement mats is performed. The reinforcements consist of plain-weave carbon, plain-weave fiberglass, and chopped fiberglass mats. Resin flow experiments are performed in a rectangular cavity with different fiber volume fractions. RL 440 epoxy resin is used as the working fluid in the experiments. Several layers of mats are laid inside the mold in each experiment and resin is injected at a constant pressure. The effects of reinforcement type and porosity on fiber bed permeability are investigated. Fiber mat permeability of woven mats show large degrees of anisotropy. Resin flow in chopped fiberglass mats is circular, suggesting an isotropic permeability tensor. In all the three cases, preform permeability increases with fiber bed porosity in a non-linear fashion. The results of this investigation could be employed in optimization of liquid composite molding manufacturing processes.     

Development of polyurethane elastomer composite materials by addition of milled fiberglass with coupling agent

Polyurethane elastomer composites were developed using milled fiberglass and their mechanical properties were studied. In particular, the organically chemical treatment of the milled fiberglass was investigated in detail. It was demonstrated that both strength and toughness of the resulting elastomer composites were improved considerably with the addition content of fiberglass. Furthermore, it was indicated that the optimal properties can be achieved by the proper addition of milled fiberglass that was chemically treated using coupling agent.     

RPU破坏及增强机理的细观分析

通过对合成的纯的和增强的硬质聚氨酯泡沫塑料（RPU）进行的细观分析,探讨了泡孔的破坏形式和增强相的作用,泡沫体的细胞行为表现为：泡壁的弯曲,压缩,拉伸到屈曲,碎裂和拉断,纤维的拔出等;短切玻璃纤维与玻璃微珠增强机理不一样,前者是对泡沫体增强;玻璃纤维的高强特性难以充分发挥,后者是对基体增强。     

玻璃钢材料疲劳极限的灰色预测

本文应用灰色系统理论对玻璃钢复合材料的疲劳性能进行研究，建立了不同交变应力与对数循环次数之间的生成函数，通过生成函数对玻璃钢材料疲劳极限预测，效果较好。     

Design of a phase/doppler light-scattering system for measurement of small-diameter glass fibers during fiberglass manufacturing

We present fundamental studies examining the design of a phase/Doppler laser light-scattering system applicable to on-line measurements of small-diameter (<15 mum) fibers during fiberglass manufacturing. We first discuss off-line diameter measurement techniques currently used in the fiberglass industry and outline the limitations and problems associated with these methods. For the phase/Doppler design study we have developed a theoretical computer model for the response of the measurement system to cylindrical fibers, which is based on electromagnetic scattering theory. The model, valid for arbitrary fiber diameters and hardware configurations, generates simulated detector output as a function of time for a finite absorbing, cylindrical fiber oriented perpendicular to the two incident laser beams. Results of experimental measurements are presented, confirming predictions of the theoretical model. Parametric studies have also been conducted using the computer model to identify experimental arrangements that provide linear phase-diameter relationships for small-diameter fibers, within the measurement constraints imposed by the fiberglass production environment. The effect of variations in optical properties of the glass as well as fiber orientation effects are discussed. Through this research we have identified phase/Doppler arrangements that we expect to have future applications in the fiberglass industry for on-line diameter monitoring and process control.     

Thermal conductivity of thermally-isolating polymeric and composite structural support materials between 0.3 and 4 K

We present measurements of the low-temperature thermal conductivity of a number of polymeric and composite materials from 0.3 to 4 K. The materials measured are Vespel SP-1, Vespel SP-22, unfilled PEEK, 30% carbon fiber-filled PEEK, 30% glass-filled PEEK, carbon fiber Graphlite composite rod, Torlon 4301, G-10/FR-4 fiberglass, pultruded fiberglass composite, Macor ceramic, and graphite rod. These materials have moderate to high elastic moduli making them useful for thermally-isolating structural supports.