排序方式: 共有9条查询结果,搜索用时 15 毫秒
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在工程实践的基础上,就金属拱型波纹屋顶设计中的理论分析与计算方法、建筑构造以及工程设计中应注意的问题等进行了探讨. 相似文献
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根据芳纶纤维、高强玻璃纤维和碳纤维力学性能的各向异性和靶板破坏特征,制备单一组分织物及混杂增强复合材料,同时以靶板对弹体的动能吸收能力为研究对象,对复合材料中树脂质量分数和织物铺层顺序进行试验研究及优化,以提高其防弹性能.研究表明:在复合材料靶板面密度接近的情况下,树脂质量分数为20%左右,复合材料的弹道性能最佳;结构优化后,抗压和抗剪切性能好的无机纤维织物放置在着弹面,抗拉性能好的有机纤维织物放置在背弹面,这种混杂复合材料的防弹性能高于单一织物增强复合材料;当混杂复合材料从着弹面到背弹面按照碳纤维、玻璃纤维、芳纶纤维织物的顺序铺层时,得到的靶板具有更佳的防弹性能. 相似文献
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To improve the ballistic resistance of the ballistic resistant composites, this paper deals with the microscopically fractographic analysis of their failure caused by Fragments Simulated Projectiles (FSP) and bullet with the objective to clarify the failure modes of the composites, and to further improve the ballistic resistance of the ballistic systems by hybridizing based on the currently market available materials.After the analysis, it has been found that the penetration of the FSP into the panels causes shear failure in the impact side of the target but extensive tension failure in the distal side of the composite target. The failure modes also include matrix fragmentation, and delamination, and with resin content as high as 30%, more filaments are broken by cutting in the composite. Compared with the failure caused by bullet, there are more cutting or shearing for the failure caused by FSP, but more compressive failure caused by bullet. This paper also discusses the effects of hybridizing differen 相似文献
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IntroductionHighperformancepara aramidfiberisakindofhighstrengthhighmodulusfiber,whichismadefromthelyotropicsolutionofPPTA(poly(p phenyleneterephthalamide) )inhighconcentratedH2 SO4 (99%)solventbydry jetwet spinning[1] .Para aramidfiberswerefirstcommeralizedbyAm… 相似文献
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多通道温度、压力检测装置的设计与实现 总被引:2,自引:0,他引:2
根据在产品设计中的实践,论述了如何利用单片机技术构成温度、压力等模拟量的智能检测系统,并对弱信号放大、A/D转换、数字滤波、温度计算等设计中的关键技术做了较为详细的论述。 相似文献
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