带束层角度对轮胎印痕的影响

试验研究以锦纶帘线为胎体,以芳纶与锦纶的复合帘线为带束层的子午线轮胎,带束层角度对轮胎印痕的影响。试验结果表明：在同种条件下,随着轮胎带束层角度的变化,轮胎接地印痕、受力分布发生变化。     

Kevlar织物软壁包容环抗冲击数值仿真分析研究

针对机匣包容性问题,提出Kevlar平纹织物本构模型的拟合方法,分别采用单层壳、多层壳、层合壳三种有限元建模方式对Kevlar织物软壁包容环弹道冲击过程进行模拟,发展了机匣包容性仿真分析模型。结果表明,多层壳模型和层合壳模型的计算结果更准确,并且可以通过调节摩擦因子使仿真结果与试验结果更接近。在此基础上研究了撞击点位置和弹体入射姿态对弹体剩余速度的影响。结果表明:在较小偏移距离内,撞击点的位置对剩余速度的影响可以忽略不计;滚转角和俯仰角对剩余速度影响较小,而对于偏航角,当角度大于30°时,剩余速度会随着角度的增大明显呈下降趋势,且弹体出射姿态也会发生明显变化。     

Effect of the structural reinforcement of composite adherends on the mechanical strength of adhesive joints

This study proposes a novel method to strengthen fiber reinforced plastic (FRP) adherends in a single lap joint (SLJ) by using Kevlar threads. The adherend reinforcement procedure consists of applying a zigzag thread in the fiber glass layers that comprise the adherend in order to subsequently manufacture the adherends using the vacuum infusion method. For this study, three single lap joint configurations were used: Adherends without Kevlar reinforcement (SLJ₁), adherends with Kevlar reinforcement with a medium step zigzag (SLJ₂) and adherends with Kevlar reinforcement with a small step zigzag (SLJ₃). Mechanical tensile tests were carried out to determine the ultimate strength and displacement of the single lap joint configurations studied. Adherends reinforced by Kevlar threads increase the strength and displacement of the single lap joint. However, the influence of the step size of zigzag threads on the adherend does not significantly influence the strength, but significantly affects the maximum displacement of the single lap joint.     

Kevlar短纤维增韧碳纤维/铝蜂窝夹芯板三点弯曲与面内压缩性能

介绍了碳纤维/铝蜂窝夹芯结构的Kevlar短纤维界面增韧方法。通过三点弯曲实验和面内压缩实验,对比增韧试件与未增韧试件的载荷位移曲线、破坏模式等特征,发现未增韧试件往往先发生界面分层破坏,继而面板和芯体分别发生局部破坏;而增韧试件通常发生整体破坏。实验数据显示,Kevlar短纤维界面增韧可以使碳纤维/铝蜂窝夹芯板的抗弯强度、压缩强度、能量吸收等力学性能分别至少提高14.06%、55.80%和61.53%。对破坏后界面的SEM观测发现:增韧试件并未发生界面脱粘,而是由于芯体撕裂造成面/芯剥离,揭示了Kevlar短纤维的界面增韧机制。对具有Kevlar短纤维界面增韧的碳纤维/铝蜂窝夹芯结构进行有限元建模,并分别对其在三点弯曲和面内压缩载荷下的力学行为进行数值分析,以指导该类夹芯结构的分析与设计。     

短Kevlar纤维增强的热塑性聚氨酯弹性体

主要介绍了短Ｋｅｖｌａｒ纤维增强的热塑性聚氨酯弹性体（ＴＰＵ）的组成、混合工艺对复合物性能之影响以及复合物加工与应用前景。     

芳纶纤维表面处理与浸渍工艺研究

采用H抽出法和橡胶弯曲疲劳试验法,考察了RF树脂的合成、RFL组成以及芳纶纤维浸渍工艺,研究了RFL组成及芳纶纤维浸渍工艺对纤维与橡胶的静态和动态粘合性能的影响。结果表明,第一浴采用环氧树脂或/和封闭异氰酸酯混合液,第二浴采用间苯二酚-甲醛-胶乳(简称RFL)双浴法,或者直接采用环氧改性RFL胶乳的一浴法都能有效地增加芳纶纤维界面粘合性能。     

加工条件对芳纶纤维增强PPS／PEK—C性能的影响

研究了短芳纶纤维增强ＰＰＳ／ＰＥＫ－Ｃ复合材料的力学性能。主要讨论了混合工艺、压制温度及冷方式等加工条件对材料力学性能的影响。     

Thermal degradation of poly(p‐phenylenebenzobisoxazole) and poly(p‐phenylenediamine terephthalamide) fibres

This study investigates the thermal stability of poly(p‐phenylenediamine‐terephtalamide) (PPT) and poly(p‐phenylenebenzobisoxazole) (PBO) fibres. Excellent behaviour of PBO is shown in comparison to that of PPT. The thermal stability (under pyrolytic or thermo‐oxidative conditions) of PBO is 150 °C higher than that of PPT. Moreover, the strong influence of oxygen, which plays the role of an initiator of degradation, on the degradation of fibres is shown. Using the invariant kinetic parameter (IKP) method, it is shown that the degradation rate of PBO is strongly reduced in comparison with that of PPT. It provides a simulation of the ‘fuel flow’ able to feed the flames, which can explain the high fire performance of PBO compared to PPT. © 2001 Society of Chemical Industry     

Kevlar/Surlyn复合材料的制备与防刺性能研究

采用模压法制备Kevlar/Surlyn复合材料,通过研究模压温度、压力、时间等工艺参数对复合材料性能的影响,确定了最佳制备工艺,模压温度170℃,模压压力3MPa,模压时间30min。研究了树脂含量对复合材料防刺性能的影响规律,结果表明Surlyn树脂含量对复合材料的防刺性能影响显著。树脂含量为47%(质量分数)时,复合材料防刺效果最优。     

Influence of Kevlar Hybridization on Dielectric and Conductivity of Bamboo Fiber Reinforced Epoxy Composite

In a motive to develop a natural fiber-based dielectric material, bamboo fiber-reinforced epoxy composite is fabricated using hand layup technique and hybridized with Kevlar K29 fiber to enhance its properties. Dielectric and conductivity studies are performed using LCR meter on the composite samples as a function of frequency (100 Hz-1 MHz) and temperature (22–120°C). From the experiment, it is observed that the dielectric properties of bamboo-based natural composite are significantly enhanced by Kevlar hybridization. And also the influence of variation in frequency and temperature on the electrical properties i.e. dielectric and conductivity of the fabricated composite was studied. The morphological study is also carried out using scanning electron microscope (SEM).