نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

تأثیر حضور سیّال غلیظ‌‌شوندۀ برشی بر رفتار الیاف پلی‌‌اتیلن فوق‌‌سنگین در برابر برخورد نرم

نوع مقاله : مقاله پژوهشی

نویسندگان
آزمایشگاه خواص دینامیکی مواد، دانشکده مهندسی مکانیک، دانشگاه صنعتی سهند، تبریز، ایران
چکیده
پژوهش حاضر اثر حضور سیّال غلیظ‌شوندة برشی (STF) را بر رفتار الیاف پلی‌اتیلن فوق‌سنگین (داینیما) در برابر برخورد نرم مورد بررسی قرار داده است. ژلاتین بالستیک به‌عنوان مادة سازندة پرتابة نرم مورد استفاده قرار گرفت وSTF در وضعیت‌های خالص و اصلاح‌شده با فشار میان دو لایه از الیاف داینیما با لایه‌چینی متقاطع توزیع شد. نمونه‌ها در شرایط بدون حضور STF و همچنین آغشته به آن توسط پرتابه‌های نرم با جرم میانگین 5/5 گرم و سرعت اولیه میانگین ۸۶ متربرثانیه مورد بارگذاری قرار گرفتند. الیاف داینیمای خالی در برابر برخورد نرم دچار برآمدگی ماندگار ۳۵ میلی‌متری و سوراخ‌شدگی شدند و به طور میانگین ۵۴ درصد از انرژی جنبشی اولیه پرتابه جذب گردید. حضور STF باعث افزایش قابل ملاحظه استحکام اهداف در هر دو وضعیت خالص و اصلاح‌شده گردید و در هیچ‌یک از این نمونه‌ها، پرتابه موفق به عبور نشد و به‌دلیل افزایش قابل ملاحظه اصطکاک بین‌لایه‌ای گستره آسیب و برآمدگی ماندگار به‌طور چشم‌گیری کاهش و به میزان کمتر از ۳ میلی‌متر رسید. در شرایط STF اصلاح شده بدون حضور حلّال اصطکاک بین‌لایه‌ای افزایشِ بیشتری داشته و نمونه‌ها بدون برآمدگی قابل اندازه‌گیری و همچنین بدون آسیب ظاهری بودند. نتایج حاکی از عملکرد بسیار مؤثر STF در افزایش استحکام سازه‌های مرکب‌ در برابر برخورد نرم، بدون تحمیل وزن و هزینة قابل ملاحظه است.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Effect of Shear Thickening Fluid on the Soft Impact Response of Ultra-High-Molecular-Weight Polyethylene Fibers

نویسندگان English

Maryam Zeynalnejad
Sina Jalili
Dynamic Behavior of Materials Lab., Faculty of Mechanical Engineering, Sahand University of Technology, Tabriz, Iran
چکیده English

The present study investigates the effect of the presence of shear-thickening fluid (STF) on the soft impact behavior of ultra-high-density polyethylene fibers (trade name Dyneema). Ballistic gelatin was used as the soft projectile material, and STF in pure and modified states was distributed by pressure between two layers of Dyneema fibers with cross-layering. To compare Dyneema targets in the absence of STF and also impregnated with it, they were loaded with soft projectiles with a mass of 5.5 g and average initial velocity of 86 m/s. The neat Dyneema fibers were permanently damaged due to perforation of the projectile with a bulge in the range of 35 mm and 54% of kinetic energy is absorbed. The presence of STF significantly increased the strength of the targets in both pure and modified conditions and the permanent bulge fell below the 3 mm. None of impregnated samples suffered from perforation due to a significant increase in interlayer friction and the extent of damage and permanent bulge was significantly reduced. In absence of the STF solvent (dried condition), the interlayer friction increased further and the samples did not experienced measurable bulge and observable damage. The results indicate the very effective performance of STF in increasing the strength of structures against soft impact, without imposing significant weight and cost penalties.

کلیدواژه‌ها English

Shear-Thickening Fluid
Soft projectile
Dyneema Fibers
Bird Strike
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