Polyurethanes for potential use in transparent armour investigated using DSC and DMA |
| |
Authors: | Email author" target="_blank">P?J?van?EkerenEmail author E?P?Carton |
| |
Institution: | (1) Defence, Security and Safety, TNO, P.O. Box 45, 2280 AA Rijswijk, The Netherlands |
| |
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). |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|