مهندسی سازه و ساخت

مهندسی سازه و ساخت

تحلیل ارتعاشات و کمانش دینامیکی غیرخطی پوسته‌های مرکب دو انحنایی تحت اثر بارگذاری حرارتی

نوع مقاله : علمی - پژوهشی

نویسندگان
1 استاد یار، دانشکده مکانیک، دانشگاه پدافند هوایی خاتم‌الانبیاء (ص)، تهران، ایران
2 استاد دانشگاه صنعتی مالک اشتر و معاون پژوهش و فناوری سازمان توسعه منابع انرژی
چکیده
در این مقاله تحلیل غیرخطی ترمومکانیک ارتعاشات گذرای و پایداری کمانشی پوسته دو انحنایی مرکب کم‌عمق تحت بارگذاری حرارتی انجام شده است. به طور توأم غیرخطی هندسی سازه و غیرخطی خواص موادی حاصل از تغییرات دما در تحلیل استفاده شده است. برای استخراج معادلات حرکت پوسته و شرایط مرزی از تئوری مرتبه اول برشی و اصل همیلتون استفاده شد. در ادامه برای حل این معادلات از روش ریتز استفاده گردیده است. به منظور توزیع دما درون پوسته فرض می‌شود تغییر دمایی با زمان و مختصات تنها در راستای ضخامت صورت می‌پذیرد. علاوه بر این، اثر پارامترهای مهمی هم‌چون تأثیرات ترتیب لایه‌چینی، انحنا و ضخامت پوسته بر تحول زمانی دما و خیز پوسته کامپوزیتی تخت و دو انحنایی تحت شرایط مرزی حرارتی مورد مطالعه قرار گرفته است. جهت صحت-سنجی نتایج، خیز مرکز ورق همگن مربعی تحت بارگذاری حرارتی با نتایج پژوهش‌ اشاره شده در ادبیات مورد مقایسه قرار گرفت. همچنین نتایج کمانش دینامیکی حرارتی پوسته کامپوزیتی تحت بار حرارتی نشان می‌دهد که با کاهش ضخامت پوسته مدت زمان سپری شده تا آستانه کمانش دینامیکی کاهش می‌یابد. شرایط لازم و کافی برای بروز پدیده کمانش دینامیکی به صورت عدم وجود بارگذاری عرضی و اعمال شرط مرزی گیردار است. همچنین وارد نمودن اثرات غیرخطی برای یافتن پاسخ کمانش یافته ضروری است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Analysis of vibrations and nonlinear dynamic buckling of bicurved composite shells under the effect of thermal loading.

نویسندگان English

Alireza Pourmoayed 1
Keramat Malekzadeh Fard 2
1 Assistant Professor,, Department of Mechanical Engineering, Khatamul-Anbiya Air Defense University, Tehran, Iran.
2 Malek ashtar univ. of technology, Professor ,
چکیده English

In this article, nonlinear thermomechanical analysis of transient vibrations and buckling stability of shallow composite bicurve shell under thermal loading has been performed. Both the geometric nonlinearity of the structure and the nonlinearity of material properties resulting from temperature changes in the analysis have been used. First-order shear theory and Hamilton's principle were used to derive the crustal motion equations and boundary conditions. In the following, the Ritz method is used to solve these equations. In order to distribute the temperature inside the shell, it is assumed that the temperature changes with time and coordinates only along the thickness. In addition, the effect of important parameters such as the effects of layering order, curvature and thickness of the shell on the temporal evolution of temperature and deflection of flat composite shell and bicurved under thermal boundary conditions has been studied. In order to validate the results, The deflect of center a homogeneous square plate under thermal loading was compared with the research results mentioned in the literature. Also, the results of thermal dynamic buckling of the composite shell under thermal load show that by decreasing the thickness of the shell, the elapsed time until the threshold of dynamic buckling is decreased. The necessary and sufficient conditions for the occurrence of dynamic buckling phenomenon are the absence of transverse loading and the application of the clamped boundary condition. It is also necessary to include nonlinear effects to find the buckling response.

کلیدواژه‌ها English

Forced vibrations
dynamic buckling
temperature
Ritz method
first order shear theory
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  • تاریخ دریافت 12 خرداد 1402
  • تاریخ بازنگری 23 مرداد 1402
  • تاریخ پذیرش 06 مهر 1402