مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی پاسخ دینامیکی ورق‌های دو‌لایه چهارگوش فلزی تحت بارگذاری دفعی غیریکنواخت

نوع مقاله : پژوهشی اصیل

نویسندگان
1 گروه مهندسی مکانیک، دانشکده فنی و مهندسی برق، مکانیک و کامپیوتر، دانشگاه ایوانکی، ایوانکی، ایران
2 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران
چکیده
یکی از اهداف اصلی مکانیک ضربه، طراحی مقاوم یک سازه در برابر انفجار با معرفی ساختاری با الگوی طراحی خاص ضمن حفظ شرایط سبک‌وزنی آن است. با توجه به کمبود نتایج تجربی، تحلیلی و عددی در زمینه تغییر شکل ساختارهای چندلایه تحت بار دفعی، در این تحقیق، تغییر شکل پلاستیک و الگوی شکست ورق‌های دولایه چهارگوش فلزی تحت بارگذاری دفعی غیریکنواخت مورد بررسی قرار گرفته است. در این سری از آزمایش‌ها، ۲۶ نمونه دولایه فلزی با چیدمان‌های مختلف فولاد- فولاد و فولاد- آلومینیوم در ضخامت‌های مختلف ساخته و طراحی شد. جهت اعمال بار دفعی غیریکنواخت از سامانه آونگ بالستیک بدون به‌کارگیری لوله‌های فاصله استقرار خرج استفاده شد. جهت جلوگیری از ترکش‌های خرج انفجاری از یک لایه ضخیم فوم پلی‌استر استفاده شد. از ورق‌های فولادی در ضخامت‌های یک، ۲ و ۵/۲میلی‌متر و ورق‌های آلومینیومی در ضخامت‌های یک و ۲میلی‌متر در پنج لایه‌بندی مختلف بهره گرفته شد. در آزمایش‌های تجربی، پارامترهایی از قبیل ایمپالس، بیشترین خیز دائمی نمونه و کرنش‌های طولی و عرضی مورد اندازه‌گیری قرار گرفت. نتایج نشان داد که استفاده از ورق آلومینیومی به‌عنوان لایه عقبی باعث اُفت عملکرد انفجاری ساختار دولایه ترکیبی فولاد و آلومینیوم تحت بارگذاری دفعی غیریکنواخت می‌شود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Experimental Investigation into the Dynamic Response of Double-Layered Quadrangular Metallic Plates Subjected to Localized Impulsive Loading

نویسندگان English

T. Mirzababaie Mostofi 1
M. Sayah Badkhor 1
H. Babaei 2
1 Mechanical Engineering Department, Electrical, Computer and Mechanical Engineering Faculty, University of Eyvanekey, Eyvanekey, Iran
2 Mechanical Engineering Department, Mechanical Engineering Faculty, University of Guilan, Rasht, Iran
چکیده English

One of the main objectives of impact mechanics is the design of a structure resistant to explosion by introducing a structure with a special design pattern while maintaining its lightweight conditions. In this study, the plastic deformation and failure pattern of quadrangular metallic plates under localized impulsive loading were investigated due to the lack of experimental, analytical, and numerical results in the field of deformation of multilayer structures under impulsive loading. In this series of experiments, 26 double-layered metallic plates with different layering arrangements of steel-steel and steel-aluminum in different thicknesses were fabricated and designed. To apply the localized impulsive load, a ballistic pendulum system was used without using standoff distance blast tubes. A thick layer of polyester foam was used to prevent explosive debris. Steel plates in different thicknesses of 1, 2, and 2.5mm, and aluminum plates in different thicknesses of 1 and 2mm in 5 different layering configurations were used. In the experimental study, parameters such as impulse, central permanent deflection, and longitudinal strains in x and y directions were measured. The results showed that the use of aluminum plate as a backing layer reduces the explosive performance of the double-layered mixed configurations of steel-aluminum plates under localized impulsive loading.

کلیدواژه‌ها English

plastic deformation
Square Plate
Rectangular Plate
Impulsive Loading
experimental test
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