中温固化环氧树脂芳纶Ⅲ纤维复合材料性能研究

对芳纶Ⅲ纤维和及其织物(F-3S175)的性能进行测试,采用热熔法制备了3233中温固化环氧树脂F-3S175芳纶布预浸料,通过热压罐法成型复合材料层合板和蜂窝夹层板,进行性能测试,与Kevlar 49纤维进行对比。结果表明,芳纶Ⅲ纤维、织物和其3233树脂复合材料性能高于Kevlar 49芳纶纤维、织物及其复合材料性能。     

芳纶Ⅲ防弹性能分析

以Staramid F358芳纶Ⅲ作为防弹材料,通过单向复合工艺制造成靶板,采用V50靶板实验研究了芳纶Ⅲ的防弹性能,对其防弹性能进行了理论分析,并与芳纶Ⅱ防弹材料进行了比较。结果表明:芳纶Ⅲ靶板的V50值为572.1 m/s,比吸能值为153 Jm2/kg;芳纶Ⅲ防弹性能比芳纶Ⅱ提高近30%;超高的拉伸断裂强度是芳纶Ⅲ防弹性能更优的根本原因,芳纶Ⅲ的防弹性能还有进一步提升的空间。     

国外芳纶纤维在软管和涂覆织物制品中的应用进展

介绍了国外Kevlar芳纶纤维在软管和涂覆织物制品中的应用进展,Kevlar芳纶纤维具有优异的力学性能,而且耐油,耐化学品性能和尺寸稳定性良好,Kevlar芳纶纤维在软管,涂覆织物制品方面具有广阔的应用前景。     

纤维增强复合防弹板研究进展及抗弹性能研究

本文简述了国内外防弹运钞车工业发展状况以及高速弹体冲击下纤维增强复合材料的研究进展。介绍了国内外运钞车所用防弹板的特性及改装车的性能。系统介绍了卵形弹体对金属面板/芳纶复合防弹板冲击破坏机理。结果表明,复合防弹板在高速弹体冲击下抗弹机理为:较高硬度金属面板使弹体变形、致偏,降低弹体对靶板的侵彻深度;高强度复合材料复合板的局部变形、分层和纤维拉伸断裂及纤维拔脱等进一步消耗弹体能量。从扫描电镜结果可知,纤维断裂方式主要为拉伸断裂。我们通过分析基体含量、靶板的面密度对V_(50)影响,提出SK75/改性弹性体复合板V_(50)的经验表达式。     

复合材料多功能防弹板防弹性能研究

虽然单一的装甲钢或芳纶板具有良好的防高速弹丸贯穿性能,但采用复合结构可以大大提高单一防弹板的防弹效率,减轻防护板面密度。通过弹道实验和数值模拟方法研究了装甲钢复合芳纶泡沫夹层结构抗56式7.62mm普通钢芯弹贯穿特性;探讨了不同复合形式的装甲钢复合芳纶泡沫夹层结构抵抗弹丸的防护效能和影响防弹板吸收子弹动能的因素;提出了该种装甲钢复合芳纶泡沫夹层结构最佳防弹速度区间的概念和相应的V50估算公式,由此可以设计出防弹效费比最佳的防弹板。     

国产对位芳纶机织物应用与发展

介绍了对位芳纶机织物的结构及性能,阐述了国产对位芳纶机织物在防弹、复合材料、音盆、建筑补强及特种过滤等领域的应用,并与应用领域内同类产品进行了比较。结果表明,对位芳纶机织物是一种性能优异的新材料,其应用潜力巨大。     

胶粘剂配方对芳纶防弹板性能的影响

本文通过不同胶粘剂配方制作成不同的芳纶防弹板,并进行力学性能和防弹性能测试,发现胶粘剂配方对芳纶防弹板的力学性能与防弹性能影响很大。较软的胶粘剂配方在单轴拉伸强度、面内剪切强度与层间剪切强度方面优于较硬的胶粘剂,而在三点弯曲强度方面,硬芳纶明显优于软芳纶。在防弹性能方面,软芳纶的防穿透性能优于硬芳纶,但在控制凹陷方面,硬芳纶要优于软芳纶。在应用过程中,要结合实际的使用情况,确定合适的胶粘剂配方。     

杜邦防弹材料用的Kevlar新品种（2）

1KevlarH－shell：供用于轻量防弹头盔的新品种新的KcvlarH－shell777型织物拥有特殊的表面处理，它是在纤维束加工过程中采用的。它用于头盔等时，能创出比标准的Kevlar29更高的防弹性能。而新型的KevlarH－shell259型织物和HtshellKM2364型织物，则具有增强的机械性能。表1对比传统的Kevlar29770型（3330dtex）平纹组织织物,对最近的由新型Kevlar（3330dtex）平纹组织的777型H－shell织物，以及对其它两种各由高强Kevlar（2×1570dtex）方平（席纹）组织和高强高仲Kevlar（945dtex）平纹组织制成的259型和364型新织物的结构。这些新…     

用于人体防护装甲的纤维复合材料的研究

本文综述了用于人体防护装甲的芳纶纤维,超高分子量聚乙烯纤维和基体树脂的研究现状,并论述了影响防弹性的因素及防弹机理。     

芳纶/酚醛复合防弹体系成型工艺技术研究

本文利用DSC、DMA试验方法,通过引入Kissinger公式,确定了适用于防弹树脂基体的固化反应动力学和固化工艺参数;根据经验确定了成型压力、树脂含量等参数的范围;并依据不同参数对弹道性能的影响程度,设计了四因子/三水平的正交试验;通过试验结果(即力学性能结构和实弹试验结果)的分析,确定了芳纶复合装甲靶板的最佳成型工艺参数.本文还进行了防弹理论的探索性研究,从理论上说明了芳纶复合装甲具备优异的弹道性能.     

环氧树脂/芳纶布复合材料性能研究与应用

研究了3233环氧树脂/796芳纶布复合材料的力学性能。结果表明,3233环氧树脂/796芳纶布复合材料的常规性能和耐热性较好,采用模压法和热压罐法成型的层压板性能相当,夹层板的滚筒剥离强度高,树脂基体具有韧性,扫描电镜观察发现复合材料的界面粘接情况良好。该预浸料已用于直升机次承力结构。     

Effect of matrix on the ballistic impact of aramid fabric composite laminates by armor piercing projectiles

Ballistic impact performance of aramid fiber fabric‐epoxy and aramid fiber fabric‐polypropylene (PP)‐based composite laminates has been studied against 7.62 mm armor piercing projectiles. Twaron® was used as aramid fiber fabric in the composites. Role of matrix on the damage pattern has been investigated by impacting the composites of different thickness with projectiles having different strike velocity (SV). Ballistic limit (BL) for each composite has been estimated through correlation of SV and residual velocity (RV) of the projectile by usual V₅₀ method. Ballistic limit was found to vary linearly with composite laminate thickness. Twaron®‐PP composites exhibited higher ballistic limit compared toequivalent thickness of Twaron®‐epoxy composites. Epoxy‐based composites exhibited localized damage mode compared to a global mode of failure in PP‐based composites. Scanning electron microscopy revealed that fibers in Twaron®‐epoxy composites failed largely by shear while tensile mode of failure was observed for Twaron®–PP composites. POLYM. COMPOS., 2012. © 2012 Society of Plastics Engineers     

Preparation and properties of a p‐aramid fabric composite impregnated with a magnetorheological fluid for body armor applications

A polyurethane (PU)‐magnetorheological fluid (MRF)/p‐aramid fabric composite was fabricated, and its mechanical properties were subsequently investigated. The contribution of the PU‐MRF matrix to the impact resistance of the system was then discussed. MRFs consist of stable suspensions of magnetite particles within a carrying fluid. Therefore, when an external magnetic field is applied, the MRFs exhibit drastic and reversible changes in rheological properties as a result of the field‐induced ordering of the particulate phase. We then attempted to develop new and enhanced bulletproof materials by incorporating MRF and PU in a p‐aramid fabric. It was found that when a magnetic field was applied, the mechanical properties of the PU‐MRF/p‐aramid fabric composite improved. It was also found that adding a PU matrix improves the impact performance of the PU‐MRF/p‐aramid fabric composite, relative to a neat p‐aramid fabric and a MRF/p‐aramid fabric composite with similar areal density. The improved impact performance of the PU‐MRF/p‐aramid fabric composite appears to be because the PU film and MRF enable different energy absorbing mechanisms, including particle friction, fabric/matrix debonding, matrix cracking, and delamination, which are not observed in neat p‐aramid fabric systems. The findings of this study are thought to be important from a design viewpoint of soft armors. POLYM. ENG. SCI., 55:729–734, 2015. © 2013 Society of Plastics Engineers     

Interlaminar fracture toughness of selectively stitched thick carbon fibre reinforced polymer fabric composite laminates

Abstract

Carbon fibre reinforced polymer fabric specimens prepared from selectively stitched thick laminates have been tested under mode I (tension) and mode II (shear) loading, similar to already established tests used for thin unidirectional specimens. The respective interlaminar fracture toughness characteristics were derived for laminates of different stitching configurations. Results indicated significant interlaminar fracture toughness increase for all stitched samples compared with non-stitched samples, especially under mode I loading. It was concluded from parametric investigations that carbon thread stitching is more effective than its aramid counterpart in improving interlaminar fracture toughness. This is attributable to its higher stiffness and better bonding to the carbon fibre reinforced polymer system compared with the aramid thread.     

改性芳纶纬编增强体复合材料力学性能的研究

为探讨芳纶纬编增强体复合材料的力学性能,以对位芳纶为原料,采用LiCl/无水乙醇溶液对芳纶表面进行改性处理,设计并编织1+1满针罗纹和罗纹空气层2种组织织物增强体,以E-51环氧树脂为基体,应用手糊成型技术制备芳纶纬编增强体平板复合材料。采用YG026D型电子织物强力机对制备的芳纶纬编增强体复合平板材料的经纬向拉伸、弯曲、压缩以及层间剪切性能进行测定。结果显示:经LiCl/无水乙醇络合溶液处理的芳纶纬编增强体复合材料的各项力学性能均有所提高,且经向的各项力学性能优于纬向。在拉伸、弯曲性能方面,罗纹空气层芳纶纬编增强体平板复合材料优于1+1满针罗纹芳纶纬编增强体复合材料。     

Promising curaua fiber‐reinforced polyester composite for high‐impact ballistic multilayered armor

A typical multilayered armor system (MAS) is composed of a harder front ceramic tile, which is able to erode heavy ammunition, such as the 7.62 mm bullet, followed by a second layer to further reduce the impact energy. Aramid fabric is a common choice for the second layer. In the present work, polyester matrix composites reinforced with 10 to 30 vol% of curaua fibers, despite having much lower strength and stiffness than aramid fabric, displayed similar trauma indentation in a standard clay witness simulating the human body. Impedance matching and scanning electron microscopy analyses suggest effective energy absorption through ceramic fragment capture by curaua composites. Additionally, because of the high cost of aramid fabric, a full MAS with curaua fiber composite is much cheaper than a MAS composed of aramid fabric. Taking into consideration, both the economical and environmental advantages of natural fibers, it is concluded that curaua fiber‐reinforced polyester composite could replace aramid fabric as the second layer in MASs for personal ballistic protection. POLYM. ENG. SCI., 57:947–954, 2017. © 2016 Society of Plastics Engineers     

机织/针织混合铺层对复合材料力学性能的影响

为使纺织复合材料同时具有机织结构复合材料和针织结构复合材料的综合力学性能,通过混合铺层方式制备机织/针织混合结构复合材料。以芳纶机织平纹织物和针织罗纹织物为增强体,以环氧树脂为基体,调整复合材料中增强体的铺层顺序,利用真空辅助成型技术制备四层层压机织/针织混合结构复合材料。通过对复合材料拉伸性能、弯曲性能和冲击性能的测试,分析混合铺层和铺层顺序对芳纶环氧树脂复合材料力学性能的影响。结果表明,混合铺层和铺层顺序对芳纶环氧树脂复合材料的弯曲强度和冲击强度有较大影响,特别是对罗纹结构复合材料纬向弯曲强度和冲击强度的改善。当采用相同铺层方式,罗纹织物为受力面时,机织/针织混合结构复合材料具有较大弯曲强度和冲击强度。     

Electrostatic discharge properties of knitted copper wire/glass fiber fabric reinforced polypropylene composites

This paper presents a study on the development conductive knitted fabric reinforced thermoplastic composites, with the intention to use them in electrostatic discharge applications. Conductive knitted fabric composites are made using polypropylene as the matrix material, glass fibers as the reinforcement, and copper wires as the conductive fillers. To facilitate knitting of stiff copper wires and glass fibers, uncommingled yarns comprising copper wires, glass fibers, and polypropylene fibers are produced using a hollow spindle spinning method. Several kinds of conductive composite laminates are made by changing the fabric knit structure, stitch density, and the composition of yarns. The electrostatic discharge (ESD) attenuation of various laminates is measured at voltage potentials 8kV and 12 kV. The variations of ESD properties of composite laminates with the fabric knit structure, stitch density, and the amount of copper are described.     

The Mechanical Properties of Particulate-filled Aramid and Polyethylene Laminates

Some mechanical properties of particulate-filled polyethylene/epoxy and aramid/epoxy laminates are reported, following earlier work with particulate-filled glass/epoxy laminates. The behaviour of the organic fibre laminates was different from that of glass fibre ones, investigated and reported earlier. There was an increase in compression strength with increasing filler content, with both kinds of organic fibre reinforcement. The interlaminar shear strength values were significantly lower for the polyethylene laminates than the aramid ones at all filler concentrations, and they fell to little more than 10MPa at high filler levels. However, the impact damage zone in drop weight tests was generally smaller for the polyethylene laminates, and the visible crack damage was less apparent than in the aramid ones. The flexural strength and modulus values are also reported. © of SCI.     

Hybridization effects on tensile and bending behavior of aramid/basalt fiber reinforced epoxy composites

In this study, the mechanical properties of aramid/basalt hybrid composite laminates were determined, and the effects of hybridization on the mechanical properties were investigated. To examine the effect of hybridization, the mechanical properties of aramid/basalt hybrid composite laminates were compared with those of aramid/epoxy and basalt/epoxy non‐hybrid composite laminates. The mechanical properties, tensile and flexural, of composite laminates were determined by performing uniaxial tensile and three‐point bending tests. The results showed that the employment of basalt fibers for partial substitution of aramid fibers in the composite laminate could provide improvements in the tensile and flexural properties. Furthermore, the results of three‐point bending tests were found that the employment of basalt fibers on compressive side across the thickness of composite laminates were realized significant improvement for flexural properties in comparison to the employment of basalt fibers on tensile side. POLYM. COMPOS., 38:1144–1150, 2017. © 2015 Society of Plastics Engineers