تحلیل تجربی و عددی تأثیر استفاده از صفحه‌های سوراخ‌دار در جلوی صفحه هدف در برابر ضربه بالستیک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی‌ارشد، مهندسی مکانیک، دانشگاه تربیت‌مدرس، تهران، ایران

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

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

چکیده

پیشتر به منظور حفاظت از افراد و تجهیزات، از صفحه‌­های زرهی یکپارچه استفاده می‌­گردید. امروزه بهره­‌مندی از صفحه‌­های زرهی با طراحی­‌های منحصر به فرد (ترکیبی از صفحه‌­های سوراخ­‌دار و پایه) مورد توجه می­‌باشد. این طراحی جدید، سازه‌­ای است متشکل از حداقل دو صفحه که یکی سوراخ‌­دار و دیگری یکپارچه (فاقد سوراخ) بوده و نحوه قرارگیری آنها بدین صورت است که صفحه سوراخ‌­دار در جلوی صفحه یکپارچه (صفحه پایه) قرار گرفته و این ترکیب در مجموع مانع از نفوذ و آسیب­‌رسانی پرتابه­‌ها به هدف تحت حفاظت می‌گردد. مطالعات تجربی و عددی که بر روی این سازه‌­ها صورت پذیرفت مشخص نمود این ترکیب از صفحه‌­ها در مقایسه با صفحه‌­های زرهی یکپارچه دارای قابلیت حفاظت بالستیک یکسان، تا 31% وزن کمتری دارند. در آزمایش‌­های انجام پذیرفته مشخص گردید اثر لبه موجب ایجاد انحراف در مسیر پرتابه و ایجاد سایش در نوک تیز پرتابه می‌­گردد که در مجموع مانع نفوذ پرتابه در صفحه پایه و عبور از آن می‌­شود. فاصله بین دو صفحه سوراخ‌­دار و پایه نیز مورد مطالعه قرار گرفت که در آن مشخص گردید به منظور اثرگذاری مناسب صفحه سوراخ‌­دار می‌بایست حداقل فاصله‌­ای به اندازه بیش از طول پرتابه بین دو صفحه لحاظ گردد. این فاصله موجب می‌گردد ضمن داشتن اثر لبه، صفحه سوراخ‌دار کمترین آسیب ممکن را در برخور پرتابه با آن بهمراه داشته باشد. با مقایسه نتایج بدست آمده از آزمایش­‌های تجربی و شبیه‌سازی‌­های عددی انجام شده به کمک نرم‌افزار LS-DYNA، همگرایی مناسبی بین نتایج مشاهده شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Experimental and numerical analysis of the effect of using perforated plates in front of the target against ballistic impact

نویسندگان [English]

  • Javad Nikzare 1
  • Gholamhosein Liaghat 2
  • Hamed Ahmadi 3
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
چکیده [English]

In the Past, monolithic armor plates were used to protect people and equipment. Today, the use of armored plates with unique designs (a combination of base plate & perforated plate) is considered. This new design is a structure consisting of at least two plates, one with a hole and the other monolithic (without holes), and they are placed in such a way that the perforated plate is placed in front of the monolithic plate (base plate) and this combination generally prevents the projectiles from penetrating and damaging the protected target. Experimental and numerical studies performed on these structures showed that this combination of plates has up to 31% less weight compared to integrated armored plates with the same ballistic protection capability. In the performed experiments, it was found that the edge effect causes deviation in the projectile path and erosion in the projectile sharp point, which in total prevents the projectile from penetrating the base plate and passing through it. The distance between the perforated & base plate was also studied, in which it was found that in order to have a proper effect of perforated plate, at least a distance greater than the length of the projectile between the two plates should be considered. This distance causes while having the edge effect, the least damage should occur in the perforated plate. By comparing the results obtained from experimental and numerical studies performed using LS-DYNA software, a good convergence between the results has been observed.

کلیدواژه‌ها [English]

  • Perforated Armor Plate
  • Base Armor Plate
  • Ballistic Impact
  • Experimental and numerical analysis
  • Ogive head projectile

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مهندسی ساخت و تولید ایران
دوره 9، شماره 7
مهر 1401
صفحه 9-21

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