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Understanding the impact properties of polymeric sandwich structures used for motorcyclists' back protectors
Institution:1. R&D Department, Dainese S.p.A., 36060 Molvena, Italy;2. Department of Industrial Engineering, University of Padova, 35131 Padova, Italy;1. Institute of Continuous Media Mechanics UB RAS, Perm, Russia;2. Perm State University, Perm, Russia;3. Leibniz Institute of Polymer Research, Dresden, Germany;1. Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai 200240, China;2. The State Key Lab of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China;3. Department of Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands;4. Department of Metallurgical Engineering, Anhui University of Technology, Ma''anshan 243002, China;5. Institute of Ferrous Metallurgy, Northeastern University, Shenyang 110819, China;1. College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China;2. Institute of Rheological Mechanics, Xiangtan University, Xiangtan 411105, China;1. Fiber and Polymer Science Program, Department of Textile Engineering, Chemistry, and Science, College of Textiles, North Carolina State University, Raleigh, NC 27695, USA;2. Statistics Ph.D. Program, Department of Statistics, College of Sciences, Raleigh, NC 27695, USA;3. Textile Chemistry Program, Department of Textile Engineering, Chemistry and Science, College of Textiles, North Carolina State University, Raleigh, NC 27606, USA;1. Department for Management of Science and Technology Development, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;2. Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City, Viet Nam;3. Institute of Research and Development, Duy Tan University, Da Nang, Viet Nam;4. Department of Environmental Energy & Engineering, Kyonggi University, Suwon 442-760, South Korea;5. Faculty of Chemistry, Hanoi University of Science, Vietnam National University, Hanoi, 19 Le Thanh Tong, Hoan Kiem, Hanoi 10000 Viet Nam;6. Vietnam Academy of Science and Technology, Ha Noi, Viet Nam;7. Department of Polymer Science and Engineering, Inha University, Incheon 22212, South Korea
Abstract:Conventional back protectors are comprised of two main parts: elastomeric foams to absorb the impact energy; and thermoplastic polymers to distribute the impact force on a wider area before the absorption process. Thermal comfort is usually maintained by vent holes within the structure. In the present work, the impact behavior of a number of samples made of materials commonly used for manufacturing such protectors was studied. Nitrile butadiene rubber as the soft layer and polyethylene thermoplastic as the hard layer were considered. The variables for the analyses were the thickness of the layers, the sample temperature and the distribution of the vent holes in the sample. The key findings are: the force distribution capability of the hard part and the stability of the impact properties with respect to temperature variations are fairly dependent on the thickness of the soft part; and a reasonable distance between two consecutive vent holes is required for achieving optimal impact protection.
Keywords:Impact absorption  Back protector  Polymer sandwich  Passive safety  Drop test  Personal protective equipment
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