共查询到20条相似文献,搜索用时 156 毫秒
1.
2.
原苏联芳纶纤维性能及初步应用研究 总被引:2,自引:1,他引:2
本文叙述了原苏联生产的ApMoc-Ⅱ-A、ApMoc-Ⅲ、CBM-5三种牌号的芳纶纤维部分物理性能,复丝力学性能以及纤维复合材料缠绕压力容器的应用研究,同时与各国的芳纶纤维进行对照,结果表明ApMoc-Ⅱ-A、ApMoc-Ⅲ是两种优于其他国家芳纶性能的芳纶纤维;ApMoc-Ⅱ/AE-4、ApMoc-Ⅲ/AE-4复合材料缠绕出来的Φ150mm、Φ480mm试验容器特性系数PV/WC值分别达到34km和30km,纤维强度转化率分别达到68.9%、67.l%,优于Kevlar-49(1965型)/AE-4复合材料缠绕出来的压力容器。 相似文献
3.
EXPERIMENTAL INVESTIGATION ON CHANGE OF COLDWORKING RESIDUAL STRAIN OF HOLE IN ALUMINIUM ALLOY SHEET
EXPERiMENTALINVESTIGATIONONCHANGEOFCOLDWORKINGRESIDUALSTRAINOFHOLEINALUMINIUMALLOYSHEETLinYing(ShenyangInstituteofAeronautica... 相似文献
4.
RESEARCH ON NURBS SKINNING SURFACE VIA COMPLEX CURVES 总被引:3,自引:0,他引:3
RESEARCHONNURBSSKINNINGSURFACEVIACOMPLEXCURVES¥ZhangLenian;ZhouLaisui;ZhouRurong(ResearchcenterofCAD/CAMEngineering,NanjingUn... 相似文献
5.
ANINVESTIGATIONOFCHEMICALSHORTCRACKCHARACTERISTICSINGC-4HIGH-STRENGTHSTEELWangRong,LouMinxiu,ZhengXiulin(NorthwesternPolytech... 相似文献
6.
7.
INVESTIGATIONOFSENSITIVITYFORSILICONMICROMECHANICALTUNING┐FORKGYROSCOPERuanAiwa(阮爱武)1,LiWanyu(李万玉)2,FengPeide(冯培德)31Automatic... 相似文献
8.
TIMEACCURATE2DNAVIERSTOKESCALCULATIONSWITHADUALTIMESTEPPINGMETHODYangYong,QiaoZhide(Faculty503,NorthwesternPolytechnicalUni... 相似文献
9.
10.
11.
Influence of pre-tension on ballistic impact performance of multi-layer Kevlar 49 woven fabrics for gas turbine engine containment systems 总被引:1,自引:0,他引:1
In this paper, ballistic impact tests on wrapped multi-layer Kevlar 49 woven fabric systems were carried out with a flat blade projectile to investigate the impact response during a fan blade out event. The influences of the number of Kevlar layers and pre-tension were discussed particularly. Test results were used to analyze failure modes and energy absorption characteristics of multi-ply Kevlar fabrics. Results show that there are two kinds of impact damage for fabrics: global deformation mainly involving stretching of yarns in the impact region and fabric wrinkle from both sides to the impact zone, and local damage characterized by yarn fracture, yarn pull-out, and yarn unraveling. The energy absorption capability of Kevlar 49 woven fabrics improves with the number of fabric layers. The energy absorbed by multi-layer fabrics increases slightly at the beginning and then decreases substantially with pre-tension. The work in this paper can provide guidance for designing light-weight multi-layer fabrics containment systems. 相似文献
12.
13.
Containment of soft wall casing wrapped with Kevlar fabric 总被引:3,自引:0,他引:3
Aramid fabrics have been commonly used in the civil turbofan engine fan blade containment system for its excellent performance. To investigate the behavior and capability of soft wall containment casing, a series of fan blade released tests were conducted on the high-speed spin tester.The soft wall casing was fabricated by wrapping multiple layers of Kevlar49 plain woven fabric around a thin steel ring. Casings with different inner metal ring and outer fabric layers number were compared. The method of using the explicit dynamic software LS-DYNA to establish the finite element analysis model for the quantitative analysis of the containment process was developed and conducted. The simulation results are in good agreement with the test results. It is shown that the containment process of the soft wall casing can be divided into three impact stages. The casing with low-stiffness inner metal ring will get severe overall deformation and lose the structural integrity when it suffers the blade impact. Kevlar fabric layers will appear large bulge on outside surface and absorb the most impact dynamic energy of the high speed released fan blade. By summing up the results of the test and simulation, an empirical critical equation was derived to describe the relationship between the released blade dynamic energy and the Kevlar fabric thickness. 相似文献
14.
用差示扫描量热法(DSC)研究了尼龙6(PA6)及Kevlar纤维(KF)表面改性对PA6/KF非等温结晶与熔融行为的影响.非等温结晶结果表明,KF起到成核作用,提高了基体PA6的起始结晶温度TConset和总结晶时间ttotaa,但是改性后的KF1(经己二酰氯处理,己内酰胺稳定化并阴离子接枝尼龙6的KF)的成核作用不如未改性的KF0(未改性KF)显著;非等温结晶的熔融行为表明,KF的引入使得低温峰的熔融温度和相对强度都比纯PA6的高,KF起到了成核作用,使得结晶的完善程度提高. 相似文献
15.
本文探讨了碳纤维增强塑料的强度与碳纤维性能的关系,结果表明二者关系密切,并指出根据材料在结构中的不同工作条件确定对碳纤维的要求时,应综合考虑对其工作性能起决定性作用的各种因素。 相似文献
16.
应用于航空航天技术的碳纤维复合材料具有相当高的比强度、高弹性模量、重量轻、热膨胀小、以及具有导电性、对酸、碱有机溶剂有很大的耐蚀性等诸多的优点。但由于材料本身为纤维织物的层压浸渍结构,使其在切削加工时难于达到较高的光洁度与精度, 相似文献
17.
18.
利用冲液装置和高频窄脉宽脉冲电流,开展了镍锰合金的脉冲电铸试验。采用扫描电镜、透射电镜 及x射线衍射法对电铸层的沉积表面形貌、晶粒大小、相结构和结晶取向进行了测试与分析。 相似文献
19.
制备了含TiO2晶种和不含晶种Na2O-CaO-SiO2系统玻璃陶瓷。以XRD研究了玻璃陶瓷的晶化行为和物相组成。通过EDS测定了TiO2在主晶相硅灰石和玻璃基质中的分布。以扫描电子显微镜和偏光显微镜对其显微结构进行了观察。研究表明,两种玻璃陶瓷样品均由硅灰石晶体和分布于晶体之间的玻璃基质构成。添加TiO2晶核剂的样品以体积晶化为主,硅灰石晶体细小,呈短柱状。硅灰石晶体中TiO2的含量明显大于玻璃基质,表明TiO2显然起到了引起体积晶化的作用。而在没有加入晶核剂的样品中,硅灰石晶体呈纤维状,以表面晶化为主,晶体定向排列明显,长径方向基本垂直于原始玻璃颗粒表面。 相似文献