Dynamic Puncture Resistance Research Articles

Effect of Process Parameters on Puncture Resistance of Composites by Needle Punching and Thermal Bonding Techniques

This article presents the effect of process parameters on both static and puncture resistance properties of composites that were made of glass fabric and nonwovens through needle-punching and thermal bonding techniques. The experiments were conducted under varying process parameters, namely, low-Tm polyester content, needle-punched density, and nonwoven plied orientation and glass fabric angle. The significance of the process parameters is determined by analysis of variance (ANOVA). It is found that the needle-punched density and low-Tm polyester fiber content impact on the static puncture resistance interactively and significantly. Also, both nonwoven plied orientation as well as glass angle have effect on the dynamic puncture resistance, but only the former significantly influences the static puncture resistance.

Investigations on Dynamic Puncture Behaviors of Integrated Composite Reinforced with Varying Fabrics

The dynamic puncture resistance of multi-layer integrated composite which was comprised of glass fabric reinforcement or Kevlar fabric reinforcement and nonwovens were discussed as related to recycled Kevlar fibers amount, number of layer and K-ply position for purpose of cost reduction and performance improvement. The result shows that, 20 wt% Kevlar fibers contained in nonwovens have the optimum puncture resistance. And the dynamic puncture force increases linearly with number of layers, and also improves proportionally as increasing number of K-ply. The resultant multi-layer composite is expected to be used as body armor interlayer and packaging materials.

Manufacture and effectiveness evaluations of high-modulus electromagnetic interference shielding/puncture resisting composites

The EMI shielding composites consisted of carbon fabric and nonwovens were developed based on needle punching and thermal bonding techniques, and their static and dynamic puncture resistances were also evaluated to resist against different puncture behaviors. The result shows that, needle-punched density and thermal bonding correlate with the EMI shielding effectiveness (SE) at particular medium and high frequency range, and respectively has interaction effect with number of layers. The mechanism of EMI shielding is reflection and absorption loss in medium-frequency, and only absorption loss in high-frequency. The static and dynamic puncture resistances improve linearly with number of layers, but both display an upward and then downward trend at increasing needle-punched density. After thermal bonding, the influence of thickness on static puncture resistance becomes significantly but on dynamic puncture resistance insignificantly. The resultant composites are expected to be used as wall interlayer and package interline in the future.

Mechanical and physical properties of puncture-resistance plank made of recycled selvages

Glass woven fabric interlayered nonwovens composed of Nylon 6 staple fibers, recycled Kevlar fibers, and low-Tm polyester fibers are prepared into the glass-interlayer plank. Afterwards, their tensile strength, bursting strength, quasistatic and dynamic puncture resistances are evaluated by changing low-Tm polyester and Kevlar fibers mass fractions. The results show that when comprising 30 wt% of low-Tm polyester fibers and 20 wt% of Kevlar fibers, the composite plank yields the maximum tensile strength, bursting strength, quasi-static and dynamic puncture resistances. The double planks arranged in cross direction have higher quasi-static and dynamic puncture resistances than those oriented in parallel direction. According to stereoscope observations, the quasi-static and dynamic puncture resistances of glass-interlayer plank have different fracture mechanism for resisting against spike penetration. In addition, the bursting strength is proportional to quasistatic puncture resistance.