مدل‌سازی تحلیلی و عددی بار ضربه‌ای بر تیر ساندویچی یک‌سرگیردار با هسته فوم آلومینیومی و رویه‌های فولادی

نوع مقاله : مقاله مکانیک

نویسنده

دانشجو مقطع دکتری، گروه مهندسی مکانیک، دانشگاه بوعلی‌سینا، همدان، ایران

چکیده

سازه ­های ساندویچی به­ دلیل دارا بودن مزایایی هم­چون استحکام بالا، سبکی و خواص مقاوم به ترک، امروزه به­ طور وسیعی درصنایع، هواپیماسازی، موشکی، دریایی و پزشکی مورد استفاده قرار می­ گیرند. به­ همین منظور، در این پژوهش به بررسی تحلیلی و عددی ضربه سرعت پایین بر روی تیرهای ساندویچی یک­سرگیردار با هسته فومی و رویه­ های فلزی پرداخته شده است. در بخش تحلیلی با استفاده از روش گالرکین معادلات حاکم بر خیز محاسبه شده و معادلات سرعت و شتاب تیر ساندویچی استخراج شده­ اند. هم­چنین جهت شبیه­ سازی این فرآیند از نرم ­افزار آباکوس استفاده شده است. در نهایت اثر پارامترهایی چون محل اعمال بار ضربه­ ای، چگالی و استحکام هسته، ابعاد، جرم و سرعت ضربه­ زننده و به­صورت تحلیلی و عددی بر روی انحراف تیر ساندویچی بررسی و مقایسه شده است. با بررسی و مقایسه نتایج به­ دست آمده، مشاهده شد که اولا تطابق خوبی بین نتایج تحلیلی و عددی برقرار است و ثانیا با حرکت محل اعمال بار از تکیه­ گاه آزاد به سمت تکیه ­گاه گیردار تیر، تغییر شکل نهایی رویه بالایی ساندویچ تیر 6/%9 کاهش و هم­چنین با افزایش نرخ جرم ضربه­ زننده از 01/0 به 04/0 و کاهش عرض ضربه ­زننده از 05/0 به 01/0 خیز نهایی رویه بالایی به ترتیب 71% و 44% افزایش می­ یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Analytical and Numerical Modeling of Impact Loading Cantilever Sandwich Beam with Aluminum Foam Core and Steel Facesheets

نویسنده [English]

  • Mohammad Solooki
PhD Student, Department of Mechanical Engineering, Bu Ali Sina University, Hammadan, Iran
چکیده [English]

Due to having advantages such as high strength, lightness, and crack-resistant properties, sandwich structures are widely used in aircraft, missile, marine, and medical industries. For this purpose, in this research, the analytical and numerical investigation of low velocity impact on cantilever sandwich beams with foam core and metal facesheets has been done. In the analytical part, using the GALERKIN method, the equations governing the rise were calculated and the speed and acceleration equations of the sandwich beam were extracted. ABAQUS software has also been used to simulate this process. Finally, the effects of parameters such as impact load application location, core density and strength, projectile mass and velocity, and dimensions have been analyzed and compared analytically and numerically on the deflection of the sandwich beam. By examining and comparing the obtained results, it was observed that, firstly, there is a good agreement between the analytical and numerical results, and secondly, with the movement of the place of application of the load from the free support to the cantilever support of the beam, the final shape of the upper part of the sandwich changes. The beam is reduced by 9.6% and by increasing the rate of projectile mass from 0.01 to 0.04 and reducing the projectile width from 0.05 to 0.01, the final rise of the upper surface increases by 71% and 44%, respectively.
 

کلیدواژه‌ها [English]

  • Sandwich beam
  • Low velocity impact load
  • Thick and weak core
  • Metal facesheets (steel)

مراجع

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مدل سازی در مهندسی
دوره 22، شماره 78
در حال تکمیل شدن
آبان 1403
صفحه 31-58

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سابقه مقاله

  • تاریخ دریافت: 20 آبان 1402
  • تاریخ بازنگری: 03 بهمن 1402
  • تاریخ پذیرش: 07 بهمن 1402

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