Hierarchical energy-consumption composite antiknock protective armor and preparation thereof
An armor and energy technology, applied in the field of materials, can solve problems such as large differences in application fields, and achieve the effect of improving protection efficiency, achieving light weight and good flame retardant performance
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Embodiment 1
[0033] In order to test the damping performance of the viscoelastic damping material used in this application, the DMA-Q800 dynamic mechanical analyzer produced by the American TA company was used to test its dynamic mechanical properties, and the loss modulus of the material ( figure 2 ), storage modulus ( image 3 ) and loss factor curves ( Figure 5 )
[0034] Depend on figure 2 It can be seen that when the frequency is constant, the loss modulus and storage modulus of the viscoelastic damping material show different laws in three different temperature ranges. -80~-40°C is in glassy state, the molecular chain segment is in a frozen state, the loss modulus is smaller than the storage modulus, but it increases slowly with the increase of temperature, the storage modulus of the material is higher and with the increase of temperature High and low; this stage corresponds to the high strain rate action stage of the material, and the mechanical properties show high elastic mo...
Embodiment 2
[0038] Embodiment 2: Performance analysis of high-strength polyurea elastomer
[0039] (1) Strain rate sensitivity analysis of high-strength polyurea elastomer
[0040] In order to verify that the polyurea elastomer has high strain rate sensitivity, the mechanical properties of the polyurea coating were tested by a universal mechanical testing machine, and the stress-strain curve of the material was obtained as follows: Figure 6 shown.
[0041] From the stress-strain curve of the material, it can be seen that under the action of low strain rate, the strength of polyurea changes significantly at strain rates of different orders of magnitude; as the strain rate increases, its elastic phase gradually becomes longer, and the elastic modulus also increases. A certain change occurs, and the second strain also decreases. However, due to the high elongation at break of polyurea elastomer, its deformation still meets the actual needs. It can be seen from the WLF equation that under...
Embodiment 3
[0046] The graded energy-dissipative composite anti-blast protective armor is composed of protective metal plate I 1, polyurea coating 2, energy treatment layer and protective metal plate II 8 in sequence. The energy treatment layer is composed of a viscoelastic damping layer, a high-strength spring 4 and a metal energy-absorbing tube 5; the viscoelastic damping layer includes a viscoelastic damping layer I 3 , a viscoelastic damping layer II 6 and a viscoelastic damping layer III 7 . The viscoelastic damping layer I 3 is located inside the polyurea coating 2 , the viscoelastic damping layer II 6 is located inside the protective metal plate II 8 , and the viscoelastic damping layer III 7 is located inside the energy-absorbing tube 5 . One end of the high-strength spring 4 is fixed in the viscoelastic damping layer I 3 , and the other end of the high-strength spring 4 is fixed in the metal energy-absorbing tube 5 through the viscoelastic damping material III 7 . The end of the ...
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