Print Email Facebook Twitter Polyurethanes for potential use in transparent armour investigated using DSC and DMA Title Polyurethanes for potential use in transparent armour investigated using DSC and DMA Author van Ekeren, P.J. Carton, E.P. Publication year 2011 Abstract A material combination that may be applied as transparent armour is glass-clad polyurethane. These are comprised of a relatively thin glass strike face and a relatively thick (transparent) polyurethane backing layer. Three transparent polyurethane samples were investigated using differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). The DSC results identified the glass transitions and in some cases the melting and crystallisation processes. The DMA experiments were only performed on heating around the glass transition region to further investigate this transition. The experiments were performed at three different frequencies (1, 10 and 100 Hz); the shift of the glass transition with the frequency was clearly observed. The method of time-temperature superposition was used to extrapolate the results to higher frequencies as the magnitude of the strain-rate occurring within ballistic applications is in the order of 1000 s-1 or higher. Polyurethane with a rubbery behaviour at normal (low) strain rates can be stiff and brittle when used as an armour component (temperature below its dynamic T g value). © 2011 Akadémiai Kiadó, Budapest, Hungary. Subject Fluid Mechanics Chemistry & Energetics Mechatronics, Mechanics & MaterialsEM - Energetic Materials EBP - Explosions, Ballistics & ProtectionTS - Technical SciencesDMADSCElastomersPolyurethanesTransparent armourBacking layersDifferent frequencyDMADSCHigher frequenciesMaterial combinationThin glassTime temperature superpositionTransition regionsTransparent armourArmorDifferential scanning calorimetryDynamic analysisDynamic mechanical analysisExperimentsGlassInvestmentsPolyurethanesStrain rateGlass transition To reference this document use: http://resolver.tudelft.nl/uuid:ccca9681-e558-43fa-beab-ebb1e109b575 DOI https://doi.org/10.1007/s10973-011-1665-8 TNO identifier 436042 ISSN 1388-6150 Source Journal of Thermal Analysis and Calorimetry, 105 (2), 591-598 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.