مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مدلسازی رفتار دوپایدارهای کامپوزیتی در شرایط ترمو-ویسکوالاستیک با استفاده از ساختار میله-فنر-میراگر

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
2 دانشگده مهندسی مکانیک، دانشگاه KTH، استکهلم، سوئد
چکیده
دوپایدارهای کامپوزیتی به‎دلیل ویژگی منحصر به‎فرد در تغییر شکل بدون نیاز به انرژی پیوسته طرفداران زیادی در صنعت به خصوص صنایع هوافضا پیدا کرده است. مزیت استفاده از این سازهها، خاصیت جمعشوندگی در عین دستیابی به طولهای بلند و سفتی بالا نسبت به وزن در راستای طول است. این ویژگی منحصر به‎فرد در کنار مزایای دیگر کامپوزیت‎ها همچون، استحکام ویژه بالا، سبکی و صلبیت بالا، موجب شده که در کاربردهای زیادی همچون بوم‎های بازشونده، آنتن و صفحات خورشیدی ماهواره از آن‎ها استفاده شود.

در این مقاله اثرات شرایط محیطی مختلف بر دوپایداری سازه دوپایدار کامپوزیتی مورد بررسی قرار گرفته است. برای توضیح رفتار مکانیکی نوار دوپایدار کامپوزیتی (BiTS) در محیط‎های مختلف، مدل مقایسهای دوبعدی متشکل از عضوهای میلهای صلب، فنرهای الاستیک و میراگرهای ویسکوز پیشنهاد شده است. روابط نیرو و انرژی حاکم بر مدل دوبعدی به‎دست آمد و از آن برای رسم منحنی انرژی کرنشی بی‎بعد در طول مسیر تغییر شکل برحسب متغیرهای مسئله استفاده شد. برای صحتسنجی رفتار مدل میله-فنر-میراگر دوبعدی در شرایط ترمو-ویسکوالاستیک، چهار BiTS ساخته شده از مواد کامپوزیتی در معرض یک چرخه خاص ترمو-ویسکوالاستیکی قرار گرفتند.

مدل دوبعدی، قادر به بیان آسانتر پدیده دوپایداری در شرایط ترمو-ویسکوالاستیک است. نتایج حاصل از آزمایش تجربی حکایت از همخوانی رفتار دوپایدار مدل میله-فنر-میراگر دو‎بعدی در شرایط ترمو-ویسکوالاستیک دارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Modeling Bistable Behaviors in Exposure of Thermo-Viscoelastic Conditions by Link-Spring-Dashpot Structures

نویسندگان English

mohammadmahdi shahryarifard 1
Mohammad Golzar 1
Gunnar Tibert 2
1 Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran
2 Department of Engineering Mechanics, KTH University,Stockholm, Sweden
چکیده English

Bistable composites have gained increased attentions in industry, especially in the aerospace industry, due to their unique feature of shape-changing without the need for continuous energy. The advantage of using these structures is their ability to package in small size, whilst deploying in long lengths and high stiffness ratio along the length. This unique feature, along with the advantages of other fiber reinforced composites such as high strength, light weight and high rigidity, has made them a good choice for many applications such as deployable booms and antennas for satellites.

In this paper, the bistablility of shell structures at different time-temperature conditions are investigated. To explain the mechanical behavior of the Bistable Tape Springs (BiTSs) in different conditions, an analogous 2D model consist of rigid linkages, elastic springs and viscous dampers is proposed. The relationships between the force and energy through the transition path for the 2D model were established and the non-dimensional strain energy paths for different initial parameters were obtained, accordingly. As a case study, four BiTSs made of composite materials are fabricated and subjected to a particular thermo-viscoelastic condition to verify all stability behaviors of the 2D LSD model under thermo-viscoelastic conditions.

کلیدواژه‌ها English

Bistable
Composite
thermo-viscoelastic
link-spring-dashpot
non-dimensional strain energy
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