مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ارایه یک مدل تحلیلی جدید و بررسی عددی ضربه بالستیک در اهداف سوراخ‌دار نیمه‌بی‌نهایت سرامیک/فلز

نوع مقاله : پژوهشی اصیل

نویسندگان
گروه مهندسی مکانیک، دانشکده فنی و مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران
چکیده
تلاش برای کاهش اثرات بالستیک پرتابه و دست‌یابی به نتایج منطقی همواره اهمیت داشته است. در این مقاله به منظور کاهش عمق نفوذ پرتابه از اهداف سوراخ‌دار استفاده شد. استفاده از این اهداف در برخورد پرتابه‌های با سرعت بالا موجب کاهش مواردی از قبیل عمق نفوذ، هزینه نهایی ساخت هدف و چگالی سطحی هدف می‌شود. هدف این مقاله، ارایه یک مدل تحلیلی جدید و کامل برای نفوذ پرتابه در اهداف سوراخ‌دار نیمه‌بی‌نهایت سرامیک/فلز، براساس مدل تحلیلی فلوز که یکی از مدل‌های مهم و اساسی در زمینه نفوذ است، بود. ابتدا مدل فلوز که برای اهداف بدون سوراخ اما بی‌نهایت سرامیک/فلز است، مورد اصلاح قرار گرفت. این مدل اصلاحی ضمن بهبود کامل نتایج عمق نفوذ در سرعت‌های پایین، تطابق بهتری با نتایج تجربی در سرعت‌های بالا نیز دارد. در مدل تحلیلی جدید، ۷ حالت مختلف برای برخورد پرتابه به سوراخ در نظر گرفته شد. در هر کدام از این حالت‌ها، زاویه تمایل و سرعت پرتابه بعد از رسیدن به فلز با توجه به ضخامت سرامیک و سرعت برخورد پرتابه متغیر بود. با در نظر گرفتن نفوذ مایل در فلز، روابط اصلاح‌شده برای شرایط جدید بازنویسی شد. در نهایت، عمق نفوذ با توجه به شرایط هدف به دست آمد. به منظور مقایسه نتایج از فرآیند شبیه‌سازی عددی در نرم‌افزار آباکوس استفاده شد. نتایج مدل تحلیلی جدید با شبیه‌سازی عددی مطابقت قابل قبولی دارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

New Analytical Model Presentation and Numerical Investigation of Ballistic Impact on Ceramic/Metal Semi-Infinite Perforated Targets

نویسندگان English

M. Sayahbadkhor
Kh. Vahedi
A. Naddaf Oskouei
Mechanical Engineering Department, Engineering Faculty, Imam Hossein Comprehensive University, Tehran, Iran
چکیده English

Efforts to reduce the ballistic effects and achieve the good results have always been important. In this article, perforated targets were used in order to reduce the penetration depth of projectile. The use of these targets in the case of high-speed projectiles reduces the number of parameters, such as penetration depth, cost of target products, and target area density. The goal of this paper was to present a new and complete analytical model for projectile penetration in ceramic/metal semi-infinite perforated targets, based on the Fellows analytical model, one of the most important models for penetration. First, the Fellows model was modified for ceramic/metal semi-infinite none-perforated targets. This modified model, while perfectly improving the results of the penetration depth at low speeds and had a better fit with experimental results at high speeds. In the new analytical model, 7 different states were considered for the projectile to impact the perforated target. In each of these states, the angle of oblique and the speed of the projectile after reaching the metal varied with respect to the ceramic thickness and the speed of the projectile's impact. Regarding the oblique impact on the metal, corrected relations were rewritten for new conditions. Finally, the depth of penetration was achieved according to the target conditions. The numerical simulation in Abaqus software was used to compare the results. The results of the new analytical model has good agreement with numerical simulation.

کلیدواژه‌ها English

Projectile Penetration
Hybrid Targets
Numerical simulation
Perforated Targets
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