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بررسی ارتعاشات آزاد صفحههای FGM دارای بازشو و سختکننده | ||
| نشریه مهندسی عمران امیرکبیر | ||
| مقاله 10، دوره 52، شماره 8، آبان 1399، صفحه 2025-2042 اصل مقاله (1.87 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/ceej.2019.15832.6047 | ||
| نویسندگان | ||
| مجتبی شهرکی1؛ Farzad Shahabian* 2؛ رضا جمعه منظری3 | ||
| 1دانشجوی کارشناسی ارشد عمران گرایش سازه، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران. | ||
| 2Civil Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad,Mashhad, Iran | ||
| 3کارشناس ارشد عمران گرایش سازه، دانشکده مهندسی، دانشگاه فردوسی مشهد، مشهد، ایران | ||
| چکیده | ||
| مواد هدفمند (FGM )گونهای از مواد مرکب هستند که به واسطهی پیوستگی ترکیب مواد تشکیلدهنده به صورت هدفمند، خواص مکانیکی مؤثرتری نسبت به مواد مرکب چندلایه دارا میباشند. بیشترین کاربرد این مواد در سازههای جدار نازک نظیر صفحهها و پوستهها میباشد. همچنین به دلیل بعضی مسایل اجرایی، ایجاد بازشو و سختکننده در ورقها ضرورت مییابد لذا در این مقاله به بررسی پارامترهای تاثیرگذار بر روی ارتعاشات آزاد صفحههای هدفمند دارای بازشو و سختکننده پرداخته شده است. برای این کار، با استفاده از نرمافزار آباکوس در ابتدا، اثر پارامترهای مهم نظیر شاخص توان حجمی، ابعاد هندسی و شرایط تکیهگاهی صفحه مورد تحلیل و بررسی قرار گرفته است. نتایج نشان میدهد که ضخامت و شاخص توان حجمی بهترتیب دارای بیشترین و کمترین میزان تأثیر بر روی فرکانسهای طبیعی هر یک از مدهای صفحهی FGM میباشند و با افزایش شرایط تکیهگاهی ساده در لبههای صفحه (کاهش گیرداری تکیهگاهی) مقدار فرکانسهای طبیعی صفحه کاهش یافته است. در ادامه، تأثیر بازشو و سختکننده بر روی فرکانسهای طبیعی صفحه صورت گرفته است که ملاحظه شد بازشوی دایرهای تأثیر بیشتری بر روی فرکانس طبیعی صفحه نسبت به بازشوی مربعی دارد و همچنین، ضخامت سختکننده نسبت به ارتفاع آن دارای اثر بیشتری بر روی فرکانس طبیعی صفحهی FGM میباشد. | ||
| کلیدواژهها | ||
| صفحهی FGM؛ شاخص توان حجمی؛ ارتعاشات آزاد؛ بازشو؛ سختکننده | ||
| موضوعات | ||
| تحلیل سازه؛ دینامیک سازه | ||
| عنوان مقاله [English] | ||
| Free vibration analysis of FGM plates with opening and stiffener | ||
| نویسندگان [English] | ||
| Mojtaba Shahraki1؛ farzad shahabian2؛ reza jome manzari3 | ||
| 1Civil Structural Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad. | ||
| 2Civil Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad,Mashhad, Iran | ||
| 3Master of Civil Structural Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| چکیده [English] | ||
| Functionally Graded Materials (FGMs) are kinds of composite materials that due to the continuity of mixture of constituent materials as Functionally Graded, have more effective mechanical properties than multilayered composite materials. The most common use of these materials is in thin[1]walled structures such as plates and shells. Due to some executive needs, make opening and stiffener in plates might be necessary. Free vibration of a system is performed only under the influence of initial conditions and without any external excitation. A system under free vibration situation vibrates with one or more its natural frequencies. If the frequency of vibration caused by the effect of external excitation is equal to the one of the natural frequencies of the system, resonance state occurs. In this case, there will be a large amplitude fluctuation that can cause fracture of huge structures such as bridges and wings of aircrafts. Therefore, in the present study, the effective parameters on free vibration of FGM plates with opening and stiffener have been studied. | ||
| کلیدواژهها [English] | ||
| FGM Shells, Volume Fraction Index, Blast Loads, Opening, Stiffener | ||
| مراجع | ||
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