بررسی عددی جابجایی پنل ساندویچی با توپولوژی هسته آگزتیک تحت بارگذاری دفعی هم‌زمان متقارن

نوع مقاله : مکانیک جامدات

نویسندگان

1 نویسنده مسئول: دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

2 استاد، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

3 دکتری، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

چکیده

امروزه استفاده از پنل‌های ساندویچی به دلیل وزن پایین و خاصیت جذب بار مطلوب افزایش یافته است. این سازه‌ها ممکن است تحت بارگذاری‌های گوناگونی قرار گیرند. لذا طراحی سازه‌ای با حداقل جابجایی تحت بارگذاری‌های مذکور می‌تواند اثرات مثبت بسیاری را در پی داشته باشد. در این پژوهش بارگذاری دونقطه‌ای هم‌زمان متقارن دفعی روی پنل ساندویچی با توپولوژی هسته لانه‌زنبوری آگزتیک، اعمال شده و با مدل مشابه، با توپولوژی هسته مربعی مقایسه شده است. با توجه به پرهزینه بودن انجام آزمایش‌های تجربی، در این پژوهش بررسی‌ها به‌صورت عددی توسط نرم‌افزار المان محدود LS-DYNA انجام شده است. پس از طراحی پنل ساندویچی و راستی آزمایی با داده‌های موجود در ادبیات تحقیق، مقادیر 0/5، 1 و 2 کیلوگرم TNT، در یک و دونقطه (0/25×2، 0/5×2 و 1×2 کیلوگرم) در فاصله 10 سانتی‌متری پنل ساندویچی با توپولوژی‌های مذکور منفجر شده و جابجایی آن‌ها مورد ارزیابی قرار گرفته است. در مرحله بعد جهت بررسی تأثیر فاصله بین بارهای انفجاری روی جابجایی پنل ساندویچی، این فاصله، 8، 10 و 12 سانتی‌متر در نظر گرفته‌شده و میزان جابجایی پنل‌های ساندویچی با توپولوژی‌های هسته آگزتیک و مربعی، تحت بارگذاری‌های مذکور، بررسی شده است. بر طبق بررسی‌های انجام‌شده پنل ساندویچی با هسته آگزتیک در تمام موارد عملکرد بهتری را نسبت به هسته مربعی از خود نشان داده و در بارگذاری‌های مختلف بین 1/6 تا 45/3 درصد، جابجایی صفحات جلو و عقبی آن کاهش یافته است.

چکیده تصویری

بررسی عددی جابجایی پنل ساندویچی با توپولوژی هسته آگزتیک تحت بارگذاری دفعی هم‌زمان متقارن

تازه های تحقیق

  • بررسی اثرات بارگذاری دفعی هم‌زمان روی پنل ساندویچی با هسته آگزتیک
  • مقایسه جابجایی پنل ساندویچی با هسته‌های مربع و آگزتیک تحت بارگذاری دفعی
  • بررسی تأثیر تغییر فاصله بین نقاط بارگذاری بر جابجایی پنل ساندویچی

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Numerical Investigation of Deflection of Sandwich Panel with Auxetic Core Topology under Simultaneous Symmetrical Impulsive Loading

نویسندگان [English]

  • Mehdi Niajalili 1
  • Majid Alitavoli 2
  • Reza Ansari Khalkhali 2
  • Mojtaba Haghgoo 3
1 Corresponding author: Ph.D. Student, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran
2 Professor, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran
3 Ph.D., Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran
چکیده [English]

Nowadays, the use of sandwich panels has increased due to their low weight and desirable load absorption properties. These structures may be subjected to various loading. Therefore, designing a structure with minimal displacement under various loadings can have many positive effects. In this study, a two-point simultaneous symmetrical impulsive loading was applied to a sandwich panel with an auxetic honeycomb core topology and compared with a similar model with a square core topology. Due to the high cost of conducting experimental tests, in this study, the investigations were carried out numerically using the finite element software LS-DYNA. After designing the sandwich panel and verifying it with the data available in the literature, amounts of 0.5, 1 and 2 kg of selected charge were applied at one and two points (2×0.25, 2×0.5 and 2×1 kg) at a distance of 10 cm from the sandwich panel with the mentioned topologies and their displacements were evaluated. In the next step, to investigate the effect of the distance between the explosive charges on the displacement of the sandwich panel, this distance was considered to be 8, 10 and 12 cm and the displacement of the sandwich panels with the auxetic and square core topologies under the mentioned loading was investigated. According to the studies conducted, the sandwich panel with an auxetic core showed better performance than the square core in all cases and the displacement of its front and rear faces decreased between 1.6% and 45.3% under different loadings.

کلیدواژه‌ها [English]

  • Auxetic
  • Simultaneous symmetrical impulsive loading
  • Sandwich panel
  • Core topology
  • Finite element software

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مراجع

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مکانیک هوافضا
دوره 21، شماره 1 - شماره پیاپی 79
شماره پیاپی 79، فصلنامه بهار
خرداد 1404
صفحه 47-60

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  • تاریخ دریافت: 28 آبان 1403
  • تاریخ بازنگری: 17 آذر 1403
  • تاریخ پذیرش: 06 دی 1403
  • تاریخ انتشار: 01 خرداد 1404

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