The paper presents results of dynamic mechanical analysis (DMA)of fiber-based laminates produced for hard ballistic applications. The traditionaltesting of ballistic protection systems with the use of live ammunition requires asuitable firing range as well as additional measuring equipment. Due to significantcosts of such testing development of a reliable and cost-effective method ofdetermining mechanical properties is well justified. The tested hard ballisticlaminates included two types of materials Dyneema® HB80 and Twaron CT 736.The experiments were carried out with the use of DMA Q800 analyzer produced byTA Instruments. The rectangular samples with dimensions of 60x10x2 mm weresubjected to dual-cantilever bending with the heating rate of 2K/min at threefrequencies of applied force measuring 1, 10 and 100 Hz. Values of dynamicstorage modulus E’, dynamic loss modulus E” were presented in dependence ontemperature in the ranges from -50°C to +60°C and +30°C to 150°C. The influenceof frequency of applied force on the results was also investigated for thepolyethylene sample. The principle of operation of DMA analysis, measured valuesas well as proper experimental conditions are described. The experimental resultsobtained with DMA of polyethylene and aramid ballistic materials are evaluatedand compared. The main aim of the research was to apply advanced testingtechnique for evaluation of ballistic protection materials in order to determine theirmechanical properties.
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