A Novel High Strain Rate Sensitive Rigid Polyurethane Resin Based Syntactic Foam

Abstract

Syntactic foams are closed cell structured foam materials and present improved properties for lightweight and high performance material requests. They have been widely used in naval, aeronautical, aerospace, civil, industrial, and automotive engineering applications on account of their good acoustical attenuation, excellent strength to weight ratio, vibration isolation, dielectric properties. In this study, a novel high strain rate sensitive syntactic foam was developed. A rigid polyurethane resin was used as a binder material. Glass bubbles were used as an additive for producing cell structure. Elastomeric silicone rubber resin were used to change elastic properties of the foam as an additional binder material. Quasistatic compression properties and high strain rate compression properties were obtained by using Instron Universal Tensile-Compression Machine and Split Hopkinson Pressure Bar experimental setup respectively. The results show that developed foams are low dense and very high strain rate sensitive materials. Consequently, developed foam can be used for the blast, impact or ballistic mitigation purpose as a coating material.

Effects of Ammonium Polyphosphate/Melamine Additions on Mechanical, Thermal and Burning Properties of Rigid Polyurethane Foams

“…Although IFR 1 addition caused 3.5% reduction in the compressive strength, IFR 3 addition decreased the compressive strength in 16%. The deterioration of mechanical properties with additives is mentioned in some studies in the literature [2,[5][6][7]. Mechanical properties are generally dependent on density and cellular structure [8].…”

“…Polyurethane materials have recently begun to be used more and more because of the advantages of their production methods and their superior mechanical and thermal properties [1,2]. They can be produced as thermoset (rigid foam, flexible foam) and thermoplastic material according to the places of use.…”

“…Among them, flexible polyurethane foams (PUF) are used in automotive and furniture sectors, while rigid polyurethane foams (PUR) are used in heat insulation sector due to their low thermal conductivity coefficients. PUR materials are also preferred for vehicle insulations due to their low densities and adequate strength values [2].…”

Investigation of the Crash Boxes Light Weighting with Syntactic Foams by the Finite Element Analysis

“…With these features, the syntactic foam materials are used in aviation, space and marine industries. In these structures, usually empty glass micro balloons are used as cell material and epoxy, polyurethane, and metal materials are used as matrix material [1][2][3][4][5]. The syntactic foams have high compression strength under static and dynamic loads [6][7][8][9][10][11].…”

“…Syntactic foams show strain rate sensitivity, depending on the micro glass bubbles percentage. Yazici presented a syntactic foam by adding micro glass bubbles and silicone rubber into polyurethane resin and obtained dynamic compression strength nine times higher than that of the quasi-static case [5].…”