تحلیل دینامیکی غیرخطی هندسی پوسته‌های استوانه‌ای MLC با هسته‌ی FGM تحت بار ضربه با استفاده از روش اجزا محدود

نوع مقاله : یادداشت پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران

چکیده

شناخت رفتار تغییرشکل‌های بزرگ پوسته‌های استوانه‌ای مرکب چندلایه (MLC) با هسته‌ی مواد هدفمند (FGM) که دارای ضخامت کم هستند در برابر بارهای ضربه‌ای، مهم می‌باشد. در این پژوهش به بررسی تاثیر تغییرات پارامترهای اثرگذار (شاخص توان حجمی مواد هدفمند، نحوه قرارگیری لایه‌ها و تعداد لایه‌های مواد مرکب) بر روی پاسخ دینامیکی پوسته‌‌ی مورد نظر تحت بار ضربه پرداخته می‌شود. تحلیل‌های دینامیکی غیرخطی هندسی پوسته‌ی استوانه‌ای به روش المان محدود توسط مدلسازی در نرم افزار آباکوس انجام شده است و اثر شاخص توان حجمی هسته‌ی FGM و پارامترهای اثرگذار مواد مرکب چندلایه همچون نوع لایه‌ها شامل پلیمر تقویت شده با الیاف شیشه (GFRP) و پلیمر تقویت شده با الیاف کربن (CFRP)، زوایه‌ی قرارگیری لایه‌ها و تعداد لایه‌ها مورد بررسی قرار گرفته شده است. نتایج حاصل از این پژوهش نشان می‌دهد که با افزایش شاخص توان حجمی، مقدار تغییر‌مکان پوسته کاهش می‌یابد. به‌طوری‌که بیشینه‌ی تغییرمکان در پوسته‌ی CFRP/FGM/CFRP با هسته‌ی تمام فلزی و کمینه‌ی تغییرمکان در پوسته‌ی GFRP/FGM/GFRP با هسته‌ی تمام سرامیکی اتفاق می‌افتد. بررسی حالت‌های مختلف قرارگیری‌ لایه‌ها نشان می‌دهد که انتخاب زوایه‌ی قرارگیری ۱۵ درجه، موجب وقوع تغییرمکان کمتری می‌گردد و همچنین با افزایش تعداد لایه‌ها، کاهش تغییرمکان مشاهده می‌شود.

کلیدواژه‌ها


عنوان مقاله [English]

Geometric nonlinear dynamic analysis of MLC cylindrical shells with FGM core under impact load using by finite element method

نویسندگان [English]

  • Mojtaba Shahraki
  • Farzad Shahabian Moghadam
Civil Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad. Mashhad. Iran
چکیده [English]

In recent decades, shells made of composite materials have been used in modern structures under impact load. Multi-Layer Composites (MLC) and Functionally Graded Materials (FGMs) are the upgrades of composites that have been considered due to their suitable mechanical properties such as high resistance to weight ratio, flexibility and impact resistance. In this research, geometric nonlinear dynamic behavior on multilayer composite cylindrical shells with FGM core under impact load has been analyzed; Because it is necessary to know how structures made of these materials behave under such loads. For this purpose, the effect of FGM core volume fraction index and the effective parameters of multi-layer composites such as the angles of the layers and the number of layers have been investigated. The results of this study show that by increasing the volume fraction index, the maximum displacement of the shell decreases. The maximum displacement occurs in the CFC (CFRP/FGM/CFRP) shell with pure metal FGM and the minimum displacement occurs in the GFG shell with pure ceramic FGM. Evaluation of the different positions of the layers shows that selecting a 15-degree positioning angle causes less displacement and also decreases the displacement as the number of layers increases.

کلیدواژه‌ها [English]

  • Multi-Layer Composites (MLC)
  • Functionally Graded Material (FGM)
  • Cylindrical Shell
  • Geometric nonlinear dynamic analysis
  • Impact Load
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