| Summary: | 博士 === 逢甲大學 === 紡織工程所 === 96 === The non-penetration damage is the main factor of a bulletproof vest in use that harmed the human body. The energy of the bullet needs to be decayed and transmitted after shooting through the design of a structure in the bulletproof vest or the use of special materials which have damping effect. In this study, the cushion structure of a sandwich made of nonwoven and the core material was used to improve the buffer effect that was evaluated by the deformation of the oil clay after bullet shooting test. The core material is consist of Chloroprene rubber material, the stainless steel screen mesh, the laid filament layer, thermal-plastic polyurethane, three-dimension crimp hollow polyester fiber layer, and honeycomb air cushion. The cushion layer was utilized to reach the cushion effect. The parameters of the experiment included the processing conditions of the compound layer fabric and different specifications of core materials. The impact properties of low velocity were measured by dropping impact test. The non-penetration damage was simulated by the deformation of the oil clay in suitable conditions. The results show that the cushion structure makes efforts to decrease the non-penetration damage and increase the ballistic resistant property of bulletproof vest.
The basic function of a ballistic resistant cloth is to prevent the bullet from penetrating. The protection of a non-penetrating damage is also the important trend that is useful for the development of ballistic resistance. The complex ballistic resistant cloth usually uses the cushion layer to decrease the local damage resulted from the impact of the bullet. This study used the cushion structure of the sandwich structure to dissipate and transmit the energy after the impact of the bullet. This study changed the forming parameters and placing conditions of compound layer fabric to discuss that the effect of these parameters on the indentation depth of Polyaramid complex laminated fabric after shooting test. This study expects that the results are useful for increasing of the ballistic resistant capability and decreasing of the cost in ballistic resistant cloth. The results show that the best manufacturing condition of content of low melted polyester staple fibers was 20%, the best process condition of needle punching density was 350 needles/cm2, and the core material was stainless steel screen mesh. The average depth of indentation of the ballistic resistant cloth without compound laminated fabric was 2.30 cm (The average initial velocity of the bullet was 393.60 m/s), and the average depth of indentation of the ballistic resistant cloth with compound laminated fabric was 2.12 cm (The average initial velocity of the bullet was 395.80 m/s). The results show that the improving of non-penetrating damage in human body was significant.
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