高低温环境对剪切硬化胶改性乙烯-醋酸乙烯酯泡沫的防护性能影响

EFFECTS OF HIGH-LOW TEMPERATURE ON PROTECTIVE PERFORMANCE OF SHEAR STIFFENING GEL MODIFIED ETHYLENE-VINYL ACETATE FOAM

  • 摘要: 乙烯-醋酸乙烯酯泡沫(ethylene-vinyl acetate foam,EVA)广泛应用于防弹衣缓冲层、护膝护肘中作为缓冲材料。文章利用剪切硬化胶(shear stiffening gel,SSG)对EVA进行改性,得到了具备更高冲击防护性能的EVA/SSG复合缓冲泡沫。为研究高低温环境对EVA/SSG泡沫材料缓冲性能的影响,利用动态热机械分析、万能压缩机对EVA/SSG泡沫在–50~50℃下的力学性能进行了研究,得到了EVA/SSG材料的损耗模量、储能模量、屈服强度随温度变化的规律;同时借助落球实验平台系统研究了高低温环境(–50~50℃)对EVA/SSG泡沫材料冲击防护性能的影响。通过分析落球冲击试验结果与材料的力学性能测试结果,系统总结了高低温环境对EVA/SSG复合泡沫材料防护性能的影响规律。

     

    Abstract: Ethylene-vinyl Acetate foam (EVA) is widely employed as a cushioning material in bulletproof vests, knee and elbow pads due to its exceptional shock-absorbing capabilities. Our research team has successfully modified EVA by incorporating Shear Stiffening Gel, resulting in EVA/SSG composite foam with enhanced impact protection properties. To investigate the effects of extreme temperature environments on the cushioning performance of EVA/SSG foam, the research team conducted a comprehensive study utilizing dynamic thermomechanical analysis and universal compression testing machines. These tests evaluated the mechanical behavior of EVA/SSG foam across a temperature range from –50°C to 50°C, revealing the temperature-dependent variations in loss modulus, storage modulus, and yield strength of the material.

     

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