تحلیل کمانش پوسته استوانه‌ای فلز –کامپوزیت طراحی شده بر اساس معیار شکست تنش ماکزیمم

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی مکانیک، پژوهشگاه هوافضا، تهران، ایران

چکیده

با تعیین زاویه مناسب جهت قرارگیری فیبرهای تقویت کننده لایه‌های کامپوزیتی پوسته‌های چند لایه فلز و کامپوزیت می‌توان سفتی این پوسته‌ها را به گونه‌ای تغییر داد تا کارایی سازه بهبود یابد. به این منظور در این پژوهش پوسته فلز-کامپوزیت تحت بار استاتیکی عرضی قرار گرفته و با استفاده از روش اجزاء محدود تحلیل تنش برای تمامی حالت‌های زوایای قرارگیری فیبرها انجام گرفته و با استخراج تنش‌های ایجاد شده در تمامی لایه‌ها و با به کارگیری معیار شکست تنش ماکزیمم، زاویه قرارگیری مناسب برای فیبرهای تقویت کننده به گونه‌ای تعیین گردیده که منجر به بیشترین استحکام ممکن برای پوسته گردد. جهت انجام تحلیل‌های فوق از نرم افزارهای عددی و تحلیلی و لینک این نرم افزارها به یکدیگر استفاده شده است. همچنین به منظور تعیین کارایی روش طراحی مذکور، تحلیل کمانش ساختارهای طراحی شده انجام گرفته است. نتایج نشان می‌دهد با تعیین زاویه مناسب قرارگیری فیبرهای تقویت کننده، مرزهای پایداری پوسته دچار بهبود قابل ملاحظه‌ای می‌گردند. از دیگر نوآوری‌های این تحقیق می‌توان به مقایسه و تعیین میزان اثربخشی تغییر ضخامت، تغییر جنس لایه‌های فلزی و تغییر زاویه قرارگیری فیبرهای تقویت‌کننده، بر روی مرزهای پایداری پوسته‌های فلز-کامپوزیت اشاره نمود. جهت افزایش دقت نتایج تحلیلی، معادلات بر مبنای تئوری مرتبه بالا استخراج گردیده اند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Buckling Analysis of Designed Fiber Metal Laminate Circular Cylindrical Shell Based on Maximum Tension Fracture Criterion

نویسندگان [English]

  • A. Nazari
  • K. Malekzadeh Fard
Department of Aerospace Engineering, Aerospace Research Institute, Tehran, Iran
چکیده [English]

In the fiber metal laminated shell with determination the proper fiber angle orientation is achieved the arrangement with maximum performance. For this purpose in this study the fiber angle orientation of composite layers of the fiber metal laminate circular cylindrical shells are changed frequently and each cases being subjected to lateral load and the tension of all composite layers are calculated for all cases. Then the fiber angle orientation that cause to maximum stiffness based on maximum tension fracture criterion is selected. For this purpose an analytical program linked to the numerical program is used and calculated result. The buckling analysis is applied to determine the performance of design process. The results of buckling analyses show that determination of the optimum fiber angle orientation causes to improvement of the fiber metal laminated shell stability. Comparing the effect of variation of the fiber angle orientation, variation of the metal layer properties and variation of the thickness shell on the buckling load is the another innovation of this study and it is determined that for various amount of metal volume fraction with change in which item the maximum stability is achived.in order to improve the result accuracy high order shear deformation theory is utilized for buckling analysis.

کلیدواژه‌ها [English]

  • Buckling
  • Fiber metal laminated
  • Fracture criterion
  • High order theory
  • Maximum tension
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