Polyester Pinning Effect on Flexural and Vibrational Characteristics of Foam Filled Honeycomb Sandwich Panels

Abstract

Polyester pins are incorporated in polyurethane foam filled honeycomb core sandwich panel to increase the interfacial strength between the faces and core in order to improve the performance of sandwich structures. Foam filled Honeycomb Sandwich panel (FHS) and Pin incorporated Foam filled Honeycomb sandwich panels (PFHS) were developed. The developed sandwich panels are tested for flexural and vibration characteristics. The influence of strain rates on flexural behaviour of sandwich panels were also evaluated. The material used for face sheets and pins are same, ends of pin act as chemically cross linked polyester joint at the interfaces of faces and core in addition to the adhesive area. This modification had effectually increased the interfacial strength thereby increased the flexural and damping properties of panels significantly. Moreover, increasing the pin diameter has a larger effect, whereas, the strain rate had a moderate influence on the failure load of both types of sandwich panels. The investigation brings to light a novel pin incorporated foam filled honeycomb sandwich panels that can be used for various applications.

Fire-resistant hydrophobic nanocoated composite partition sheets

“…All the composites manufactured showed better flexural strength which attributed with the glass fiber content in them. 22,28 Also, the flexural strength of the composites with waste nylon reinforcement is higher than their analogues which is due to the better flexibility of nylon fibers. 22,23 As the number of fishing net layers increased, the values also are more pronounced as shown from the bar chart in Figure 4.…”

“…Excess resin is collected at the outlet tank and care is taken for the resin, not to be infiltrated into the vacuum pump. Curing was done at clamping pressure of 0.6 bar at room temperature of 26 C. 28,29 The hybrid sheet, after complete curing, was then removed from the acrylic sheets easily with the aid of the releasing agent. A simple 3-D model of hybrid 1 is shown in Figure 1.…”

Structural Performance of Polyurethane Foam-Filled Building Composite Panels: A State-Of-The-Art

“…Also, numeric simulations were carried out to evaluate the stress distributions in the specimen components as well as bearing mechanism of the connections. In addition, Jayaram et al [57] studied incorporating polyester pins in a polyurethane foam-filled honeycomb core composite panel to increase the interfacial strength between the faces and core (Figure 14). The effect of strain rates on bending performance of composite panels was also evaluated.…”

“…They discussed the influence of the panel thickness, through-thickness fibre configuration and density, and other parameters on the tension, compression, flexure and shear behaviour, deeply. In addition, Jayaram et al [57] studied incorporating polyester pins in a polyurethane foam-filled honeycomb core composite panel to increase the interfacial strength between the faces and core (Figure 14). The effect of strain rates on bending performance of composite panels was also evaluated.…”

“…The feasibility of using the connectors and SFRSCC on the outer layers is studied through a series of pull-out tests where failure modes and load capacity of the connections are analysed. Table 4 shows a summary of references [57,58,[64][65][66][67][68][69][70]. Mostafa et al [69] presented semicircular shear keys to improving the shear performance and skin-core peeling resistance for foam-filled composite panels with the core.…”