Influence of conditioning on the high strain rate compression response of Kevlar thermoplastic composites,Polymer Composites

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Influence of conditioning on the high strain rate compression response of Kevlar thermoplastic composites
Polymer Composites ( IF 4.8 ) Pub Date : 2020-09-29 , DOI: 10.1002/pc.25818
Hemant Chouhan ₁ , Neelanchali Bhalla ₁ , Aswani Kumar Bandaru ₂ , Naresh Bhatnagar ₁

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Kevlar reinforced composite material systems are widely used for personal body armors. Due to aging or minor damage while in service, body armor may get exposed to external weather conditions, including moisture. The present study investigates the effect of moisture on the high strain rate behavior of Kevlar/Polypropylene (K‐PP) composite. Flat K‐PP composite laminate was manufactured using a vacuum‐assisted compression molding followed by laser machining. Dynamic compressive loading tests were performed using split Hopkinson pressure bar setup. The phenomenological modeling approach was adopted to characterize the rate‐dependent behavior of dry and wet composites. For identical dynamic compressive loading, different strain rates, strains, and stresses were attained by the dry and wet composite specimens. Macroscopic and microscopic imaging was done to expose the variation in damage behavior as a function of moisture absorption. Significant property reduction as a function of moisture absorption emphasizes the need for moisture proofing and protecting the armor products from minor damages leading to sites for moisture ingress.

中文翻译：

条件对凯夫拉尔热塑性复合材料高应变率压缩响应的影响

凯夫拉尔增强复合材料系统广泛用于个人防弹衣。由于在使用中老化或轻微损坏，防弹衣可能会暴露在外部天气条件下，包括湿气。本研究调查了水分对Kevlar /聚丙烯（K-PP）复合材料的高应变速率行为的影响。平板K‐PP复合材料层压板是通过真空辅助压缩成型，然后进行激光加工制成的。使用分开的Hopkinson压力杆设置进行动态压缩载荷测试。采用现象学建模方法来表征干，湿复合材料的速率依赖性行为。对于相同的动态压缩载荷，干，湿复合材料试件可获得不同的应变率，应变和应力。进行了宏观和微观成像，以揭示损伤行为随吸湿性的变化。随吸湿性而显着降低的性能强调需要防潮并保护装甲产品免受轻微损坏，从而导致水分进入。

更新日期：2020-09-29

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