مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی عددی و تجربی تغییر شکل صفحات ساندویچی مدور با هسته لوله عمودی فلزی تحت بار انفجار آزاد

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشگاه گیلان
چکیده
در این تحقیق، تغییر شکل ساندویچ پانل‌های فلزی دایروی با هسته لوله‌ عمودی تحت بار انفجار به صورت عددی و تجربی مورد بررسی قرار گرفته است. رابطه توازن انرژی در اجزاء مختلف سازه دیده شده است. لوله‌های هسته با چیدمان متقاطع و به صورت عمودی با ارتفاع یکسان بین ورق‌های فوقانی و تحتانی سازه ساندویچی تعبیه شده‌اند. میزان انرژی جذب شده توسط هسته‌ها بر حسب موقعیت قرارگیری در سازه، تعداد، و قطرشان تعیین شده است. گروه‌بندی آزمایش‌ها برای انجام این تحقیق بر حسب ضخامت ورق 2/1 و 2 میلیمتر و با هسته­های آلومینیومی به قطرهای 12 و 16 میلیمتر صورت گرفته است. شبیه­سازی عددی به صورت انفجار آزاد و با تعریف تابع فشار به روش کانوپ در نرم­افزار آباکوس انجام شده است. به منظور صحت­سنجی نتایج عددی، آزمایش تجربی با ساخت سازه ساندویچی انجام شده است. در هر دو روش، حداکثر جابجایی عرضی سازه در مرکز آن و جابجایی بر حسب فاصله از مرکز سازه، در محل‌های قرارگیری هسته‌ها اندازه‌گیری شده است. افزایش تعداد لوله‌های هسته سازه، حداکثر خیز در رویه فوقانی را کاهش داد و جابجایی عرضی ورق تحتانی را کمتر کرد. سازه‌هایی با تعداد هسته و ضخامت ورق کمتر، جذب انرژی بیشتری از خود نشان دادند. میانگین اختلاف بین نتایج روش‌های عددی و تجربی تقریباً 11 درصد بود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Numerical and experimental investigation of deformation of circular sandwich plates with vertical metal tube core under free blast load

نویسندگان English

Seyed Mahmood Farmani
Majid Alitavoli
Hashem Babaei
Mojtaba Haghgoo
University of Guilan
چکیده English

In this research, the deformation of circular metal sandwich panels with vertical tube cores under blast load has been investigated numerically and experimentally. The relationship of energy balance in different components of the structure has been considered. The core tubes are installed in a cross arrangement and vertically with the same height between the upper and lower sheets of the sandwich structure. The amount of energy absorbed by the cores is determined according to their location in the structure and the effect of their number and diameter. The grouping of the desired tests for this research has been done according to the thickness of the sheet 1.2 and 2 mm and with aluminum cores with diameters of 12 and 16 (mm). Numerical simulation has been done in the form of free explosion and by defining the pressure function using the Conwep method in Abaqus software. To validate the numerical results, experimental tests have been carried out with the construction of sandwich structure. In both methods, the maximum lateral displacement of the structure at its center and the displacement in terms of distance from the center of the structure, at cores location have been measured. Increased number of tubes in the core of the structure decreased the maximum rise in the upper layer and decreased the transverse displacement of the lower sheet. Structures with fewer cores and less sheet thickness showed more energy absorption. The average difference between the results of numerical and experimental methods was approximately 11%.

کلیدواژه‌ها English

circular sandwich plate
vertical tubular core
free explosion
large deformation
Energy balance
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