بررسی المان محدود کمانش پوسته کروی ساندویچی نسبتاً ضخیم با هسته مشبک و لایه‌های تقویت شده با سیم‌های حافظه‌دار شکلی

نوع مقاله : گرایش دینامیک، ارتعاشات و کنترل

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

2 نویسنده مسئول: استاد، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

3 استادیار، دانشکده مهندسی هوافضا، دانشگاه صنعتی مالک اشتر، تهران، ایران

چکیده

در تحقیق حاضر، برای اولین بار رفتار کمانش پوسته‌های ساندویچی کروی نسبتاً ضخیم دارای هسته مشبک و رویه‌های تقویت شده با سیم‌های حافظه‌دار شکلی (SMA) مطالعه شده است. هسته پوسته به صورت مشبک و سلول‌های آن به صورت چهار ضلعی بوده و رویه‌های پوسته توسط سیم‌های SMA با توزیع یکنواخت و تک‌جهته تقویت شده است. جهت انجام شبیه‌سازی‌ها از روش المان محدود و نرم افزار ABAQUS استفاده شده است. رفتار سوپرالاستیک SMA با استفاده از مدل Brinson تعریف شده و تبدیلات فازی به کمک زیربرنامه UMAT در نرم‌افزار آباکوس اعمال شده است. پس از انجام شبیه‌سازی و استخراج نتایج، تأثیر پارامترهای هندسی و مکانیکی مؤثر مانند شعاع انحنای پوسته، کسر حجمی سیم‌های SMA و میزان پیش‌تنیدگی آنها بر بارهای کمانش پوسته بررسی شده است. نتایج نشان می‌دهد که سیم‌های SMA باعث ایجاد تنش‌های بازیافتی شده که به صورت نیروی کششی بر لایه‌های بالایی پوسته اعمال می‌شود. این ویژگی باعث افزایش سفتی پوسته و در نتیجه بیشتر شدن بار کمانش می‌شود. افزایش کسر حجمی سیم های SMA از 0 تا 0.6 درصد بازای α برابر با 0.1 ، باعث افزایش 325 درصدی در بار کمانش می گردد. علاوه بر این بار کمانش واحد حجم پوسته دارای هسته مشبک و بدون هسته مشبک به ترتیب برابر 0.71 و 0.79 به دست می‌آید که نشان می‌دهد وجود هسته مشبک باعث افزایش 11 درصدی در بار کمانش ویژه می‌شود. این افزایش در کنار کاهش وزن سازه باعث آشکار شدن اهمیت استفاده از سازه‌های ساندویچی با هسته مشبک می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Buckling Finite Element Analysis of Moderately Thick Spherical Sandwich Panel with Grid Stiffened Core and SMA Reinforced Layers

نویسندگان [English]

  • Ahmad Darabi 1
  • Keramat Malekzadehfard 2
  • Seyyed Mehdi Nabavi 3
1 Ph.D. Student, Faculty of Aerospace Engineering, Malek-e-Ashtar University of Technology, Tehran, Iran
2 Corresponding author: Professor, Faculty of Aerospace Engineering, Malek-e-Ashtar University of Technology, Tehran, Iran
3 Assistant Professor, Faculty of Aerospace Engineering, Malek-e-Ashtar University of Technology, Tehran, Iran
چکیده [English]

In the present study, the buckling behavior of moderately thick spherical sandwich panels with grid stiffened core and shape-memory wires (SMA) reinforced layer is studied for the first time. The core of the panel is a grid structure and its cells are tetrahedral, and the outer layers are reinforced by SMA wires with a uniform, one-way distribution. The finite element method is used to perform the simulations. The Brinson model is used for SMA super-elastic behavior definition and fuzzy transformations are applied using the UMAT subroutine in ABAQUS software. The effect of effective geometric and mechanical parameters such as the radius of curvature of the shell, the volume fraction of SMA wires, and their prestressing on the buckling loads of the shell are verified. The results show that SMA wires cause recycled stresses that are applied as a tensile force on the upper layers of the shell. This characteristic increases the stiffness of the shell and leads the buckling load growth. If α =0.1, Increasing the volume fraction of SMA wires from 0 to 0.6% leads to the buckling load growth by 325%. In addition, the buckling load per unit volume of the shell with grid core and without grid core is 0.71 and 0.79, respectively, which indicates that the presence of grid core increases the specific buckling load by 11%. This increase, along with the reduction in the weight of the structure, highlights the importance of using sandwich structures with grid cores.

کلیدواژه‌ها [English]

  • double-curved shell
  • sma wire
  • grid-stiffened core
  • finite element analysis
  • buckling load

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دوره 18، شماره 3 - شماره پیاپی 69
شماره پیاپی 69، فصلنامه پاییز
مهر 1401
صفحه 155-167
  • تاریخ دریافت: 23 اسفند 1400
  • تاریخ بازنگری: 19 اردیبهشت 1401
  • تاریخ پذیرش: 25 اردیبهشت 1401
  • تاریخ انتشار: 01 مهر 1401