نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری، مهندسی مکانیک، دانشگاه تربیت مدرس، تهران ، ایران

2 استاد، مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

3 استادیار، مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

4 دانشیار، مهندسی پلیمر، دانشگاه تربیت مدرس، تهران، ایران

5 دانشجوی فوق دکتری، مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

10.22068/jstc.2018.89643.1457

چکیده

در این مقاله عملکرد بالستیکی چندلایه‌های کامپوزیتی دو و چهار لایه ساخته شده از پارچه کولار و رزین اپوکسی مورد بررسی قرار گرفته است. نمونه‌ها با استفاده از روش لایه‌گذاری دستی ساخته شده و تحت آزمایش ضربه بالستیک قرار گرفت. حد بالستیک و انرژی جذب شده، به عنوان معیاری از عملکرد بالستیکی صفحات کامپوزیتی ارزیابی گردید. آزمایش‌ها با استفاده از پرتابه استوانه‌ای سرکروی و در محدوده سرعت 20-120 متر بر ثانیه انجام شد. نحوه خرابی و شکست نمونه‌های کامپوزیت مورد ارزیابی قرار گرفت. همچنین با استفاده از نرم‌افزار ال اس داینا، ضربه سرعت بالا روی صفحات کامپوزیتی شبیه‌سازی شده است. بدین منظور، مدل دقیقی از پرتابه و هدف تهیه شد. لایه‌های کامپوزیت بصورت مجزا مدل‌سازی و با اعمال قیود مناسب به هم متصل گردید. این مدل عددی، با دقت خوبی میتواند سرعت حد بالستیک هدف‌های کامپوزیتی را تعیین نماید. حداکثر خطا برای نمونه‌های 2 و 4 لایه به ترتیب 6 و 10 درصد می‌باشد. به منظور بررسی اثر شکل دماغه پرتابه بر عملکرد بالستیکی کامپوزیت کولار/اپوکسی، شبیه‌سازی نفوذ با استفاده از دو پرتابه سرکروی و سرتخت در سرعت‌های مختلف انجام شد و حد بالستیک و انرژی جذب شده برای دو نوع پرتابه مقایسه گردید. حد بالستیک برای کامپوزیت دو و چهار لایه تحت ضربه پرتابه سرتخت، به ترتیب m/s 32.5 و43.7 می‌باشد که نسبت به پرتابه سرکروی 14 و 16 درصد افزایش دارد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental and numerical analysis of high velocity impact on Kevlar/Epoxy composite plates

نویسندگان [English]

  • Amin Khodadadi 1
  • Gholamhossein Liaghat 2
  • Hamed Ahmadi 3
  • Ahmad Reza Bahramian 4
  • Davoud shahgholian 1
  • Yavar Anani 5
  • samane Asemani 1

1 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

2 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

3 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

4 Department of Polymer Engineering, Tarbiat Modares University, Tehran, Iran

5 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

چکیده [English]

In this paper, the ballistic performance of two and four-layer composite plates made of Kevlar fabric and epoxy has been investigated. Composite samples were made by hand-laying method and ballistic tests were conducted. The ballistic limit and absorbed energy were evaluated as a criteria of the ballistic performance of composite plates. Experiments were carried out using a hemispherical projectile in a velocity range of 20-120 m/s. Damage and failure of composites was evaluated. Also, using the LS-DYNA software, high velocity impact simulation on composite plates was performed. So, a precise model of projectile and target was prepared. The composite layers are individually modeled and connected to each other by appropriate constraints. This numerical model can accurately determine the ballistic limit of composite targets. Maximum error was 6 and 10% for 2 and 4 layer composites respectively. In order to investigate the effect of the projectile shape on the ballistic performance of the Kevlar/Epoxy composite, simulation was carried out using a hemispherical and blunt projectile at different velocities and ballistic limit and absorbed energy for two types of projectiles were compared. The ballistic limit for 4 and four-layer composites under impact of blunt projectile is 32.5 and 43.7 m/s, which is 14 and 16% higher than the hemispherical projectile.

کلیدواژه‌ها [English]

  • High velocity impact
  • Kevlar/Epoxy composite
  • Ballistic limit
  • LS-DYNA
  • projectile nose shape

 

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