Abstract To claim ‘wearability’, clothing for protection against impact injury must not only act locally as a rigid shell under impact in order to satisfy drop-weight tests, but also flex freely with normal movement and offer permeability and light weight. Previous materials used carrier textiles coated with ‘dilatant’ but mechanically weak polyborodimethylsiloxane (PBDMS) compounds. We outline a procedure for developing blends of PBDMS with thermoplastic elastomers which, while minimizing the force transmitted in standard drop-weight tests on monolithic plate, can also be injection moulded into more wearable 3D shell structures. The first successful blends were developed by trial-and-error, involving the melding and testing of many plate specimens. The new procedure uses dynamic mechanical thermal analysis and time-temperature superposition to calibrate Zener-solid models for specific conditions within the service temperature and impact-speed envelope. Each model material is then subjected to a virtual drop-weight impact test to estimate the peak transmitted impact force. These results guide the selection of blends suitable for further development, correlating well with those obtained using the previous, more laborious procedure. When distributed within a suitable blend, PBDMS contributes considerably greater impact force attenuation than bulk uniaxial tests indicate.

中文翻译：

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开发热塑性弹性体-聚硼二甲基硅氧烷共混物用于个人冲击保护的机械和流变测试

摘要 要声称“耐磨”，防冲击损伤的服装不仅必须在冲击下局部充当刚性外壳以满足落锤试验，而且还必须在正常运动时自由弯曲，并提供透气性和重量轻。以前的材料使用涂有“膨胀剂”但机械强度较弱的聚硼二甲基硅氧烷 (PBDMS) 化合物的载体纺织品。我们概述了开发 PBDMS 与热塑性弹性体共混物的程序，该程序在最大限度地减少在整体板上标准落锤测试中传递的力的同时，还可以注塑成更耐磨的 3D 外壳结构。第一个成功的混合物是通过反复试验开发的，涉及许多板样品的融合和测试。新程序使用动态机械热分析和时间-温度叠加来校准齐纳固体模型，以针对服务温度和冲击速度包络内的特定条件。然后对每种模型材料进行虚拟落锤冲击测试，以估计传递的峰值冲击力。这些结果指导了适合进一步开发的混合物的选择，与使用先前更费力的程序获得的那些很好地相关联。当分布在合适的混合物中时，PBDMS 对冲击力的衰减作用比散装单轴试验表明的要大得多。然后对每种模型材料进行虚拟落锤冲击测试，以估计峰值传递冲击力。这些结果指导了适合进一步开发的混合物的选择，与使用先前更费力的程序获得的那些很好地相关联。当分布在合适的混合物中时，PBDMS 对冲击力的衰减作用比散装单轴试验表明的要大得多。然后对每种模型材料进行虚拟落锤冲击测试，以估计峰值传递冲击力。这些结果指导了适合进一步开发的混合物的选择，与使用以前更费力的程序获得的那些很好地相关联。当分布在合适的混合物中时，PBDMS 对冲击力的衰减作用比散装单轴试验表明的要大得多。