علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

بررسی پایداری ورق ساندویچی با هسته آگزتیک تقویت شده با نانو لوله های کربنی تحت تاثیر نیروی آیروالاستیک

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار، مهندسی مکانیک، دانشگاه اراک، اراک.
2 کارشناس ارشد ، مهندسی مکا نیک ، دانشگاه اراک، اراک.
چکیده
در تحقیق حاضر، تحلیل پایداری یک ورق ساندویچی سه لایه با هسته آگزتیک تحت نیروی آیروالاستیک در شرایط مرزی ساده مورد بررسی قرار گرفته است، که در این ورق ساندویچی لایه وسط یا به اصطلاح هسته مرکزی از ساختار آگزتیک و لایه های بالایی و پایینی از جنس ماده ایزوتروپیک تشکیل گردیده است و ورق از یک طرف تحت نیروی آیروالاستیک قرار دارد. به منظور کاهش شدت ارتعاش سازه، لایه های بالایی و پایینی ورق بوسیله نانولوله های کربنی تقویت شده است. جهت تحلیل و مدلسازی ارتعاش ورق، از تئوری برشی اصلاح شده و نیروی آیرودینامیکی وارده از سمت جریان هوا بر روی ورق با فرض تئوری پیستون مرتبه اول استفاده شده است. با استفاده از اصل همیلتون، معادلات حاکم بر رفتار ارتعاشی ورق ساندویپی بدست آمده است و برای حل معادلات از روش باقیمانده وزنی گلرکین استفاده شده است. برای نشان دادن اعتبار روابط حاصله و روش حل ارائه شده، نتایج این تحقیق با نتایج منتشر شده در مقالات معتبر و نتایج حل عددی با استفاده از روش گلرکین به کمک نرم افزارهای تجاری مقایسه شده است. نهایتا تاثیر پارامترهای مختلف مانند ابعاد هندسی ورق ساندویچی، ابعاد هسته آگزتیک، فشار آیرودینامیکی و کسر حجمی نانولوله کربنی بر پایداری سازه مورد بررسی و تجزیه و تحلیل قرار گرفته است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Stability Analysis of a Sandwich plate with an Auxetic Core Reinforced with Carbon Nanotubes under Aeroelastic Forces

نویسندگان English

Korosh Khorshidi 1
Hanieh Norowzian 2
1 Department of Mechanical Engineering, Arak University, Arak, Iran.
2 Department of Mechanical Engineering, Arak University, Arak, Iran.
چکیده English

In the present study, the stability analysis of a three-layer sandwich plate with an auxetic core under aeroelastic forces has been investigated using simply supported boundary conditions. In this sandwich plate, the middle layer, or the so-called core, is made of auxetic material, while the upper and lower layers are composed of isotropic material. The plate is subjected to aerodynamic forces from one side. To reduce the intensity of the vibrations in the structure, the upper and lower layers of the plate has been reinforced with carbon nanotubes. For the analysis and modeling of the plate's vibrations, the modified shear deformation plate theory has been employed and the aerodynamic forces applied from the airflow, assuming first-order piston theory. Using Hamilton's principle, the governing equations of motion for the vibrational behavior of the sandwich plate have been derived, and the Galerkin method with weighted residuals has been used to solve these equations. To demonstrate the validity of the derived relationships and the proposed solution method, the results of this study have been compared with results published in reputable articles and numerical results obtained using the Galerkin method with commercial software. Finally, the effects of various parameters such as the geometric dimensions of the sandwich panel, the dimensions of the auxetic core, aerodynamic pressure, and the volume fraction of carbon nanotubes on the stability of the structure have been analyzed and discussed.

کلیدواژه‌ها English

Sandwich Panel
Auxetic Core
Vibration
Stability
Aeroelastic Forces
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