نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه صنعتی نوشیروانی بابل، بابل
2 دانشگاه صنعتی نوشیروانی بابل
چکیده
در این مقاله پاسخ غیرخطی تغییرمکان یک پانل استوانه‌ای ساندویچی تحت بارگذاری دینامیکی ضربانی با درنظر گرفتن قابلیت تغییرشکل هسته مورد مطالعه قرار گرفته است. با استفاده از تئوری مرتبه بالای ارائه شده برای هسته پانل‌های ساندویچی، معادلات حاکم بر حرکت بر مبنای نظریه ارتجاعی سه‌بعدی به‌کار گرفته شده است. همچنین رفتار کمانش دینامیکی ضربانی صفحات جانبی پانل با استفاده از معیار بادیانسکی- راس، بررسی شده است. برای لایههای داخلی و خارجی پانل مواد اورتوتروپیک و برای لایه میانی مواد همسانگرد ویسکوالاستیک از جنس فوم پلی‌وینیل‌کلراید در نظر گرفته شد. تأثیر پارامترهای مختلف مانند ابعاد پانل، ضخامت هسته و لایههای جانبی، مدت ضربان و بیشینه فشار وارد شده روی پاسخ دینامیکی غیرخطی و مقاومت کمانشی پانل ساندویچی مورد مطالعه قرار گرفت. نتایج به‌دست آمده در این مقاله با نتایج ارائه شده در مقالات دیگر و همچنین نتایج به‌دست آمده از حل المان محدود در نرم‌افزار Ansys برای پانل‌های سه لایه مقایسه شده و دقت خوبی مشاهده شده است. نشان داده شده است که با افزایش ضخامت پانل یا کاهش شعاع آن، مقاومت کمانش دینامیکی ضربانی افزایش می‌یابد.
کلیدواژه‌ها
عنوان مقاله [English]
Non-linear Response and Dynamic Buckling Analysis of a Cylindrical Sandwich Panel with a Flexible Core under Blast Loading
نویسندگان [English]
- S. A. Ahmadi 1
- M. H. Pashaei 2
- R. A. Jafari-Talookolaeilokoolaei 1
چکیده [English]
In this paper, three-dimensional displacement response of a cylindrical sandwich panel with compressible core under the action of dynamic pulse loading is addressed using the extended high order sandwich panel theory. Also, local dynamic pulse buckling of facesheets is studied by considering the Budiansky-Roth buckling criterion. It is assumed that the sandwich panels consist of orthotropic face sheets and an isotropic viscoelastic foam core layer. The effects of various parameters including the panel span, core and facing thickness, pulse duration and maximum pressure on the non-linear dynamic response and buckling strength of the sandwich cylindrical panel are studied. The results obtained from the present method are compared with finite element solutions using the commercial software ANSYS and those reported in the literature, showing a good agreement. It is revealed that applied core non-linear theory could be satisfactory for the dynamic pulse response of sandwich viscoelastic panels. It is also shown that the pulse buckling strength of panel increases with a decrease of the panel radius or an increase of the panel thickness.
کلیدواژه‌ها [English]
- Dynamic buckling
- Cylindrical sandwich panel
- Compressible core
- Blast
- Nonlinear response
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