تحلیل رفتار کمانش تیر-ستون ماهیچه‌ای کامپوزیتی چند لایه با مقطع ناودانی تحت نیروی محوری و لنگر انتهایی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی مکانیک، دانشگاه کاشان، کاشان، ایران

2 گروه مهندسی عمران، دانشکده مهندسی، دانشگاه کاشان، کاشان، ایران

چکیده

امروزه، استفاده از المان‌های پوسته‌ای کامپوزیتی نظیر تیرهای ماهیچه‌ای با مقطع جدار نازک به دلیل قابلیت آن‌ها در مصرف بهینه مصالح و کاهش وزن سازه در بسیاری از صنایع از جمله هوا فضا، دریایی و خودرو سازی افزایش قابل توجهی یافته است. طراحی اعضای جدار نازک بایستی به گونه‌‌ای صورت پذیرد که پارامتر نسبت استحکام به وزن تا حد قابل قبولی بالا باشد تا از نظر صرفه‌‌جویی در مصرف مصالح و هزینه بهینه گردند. با توجه به این نکته در این تحقیق، پایداری خمشی-پیچشی تیر-ستون ماهیچه‌ای جدار نازک با نیم‌رخ ناودانی از جنس کامپوزیت الیافی تحت شرایط مرزی مختلف مورد بررسی قرار گرفته است. بدین منظور، انرژی پتانسیل کلی حاکم بر مسئله بر مبنای مدل ولاسو برای مقاطع جدار نازک باز، تئوری کلاسیک لایه‌ای و با فرض چیدمان متقارن استخراج می‌گردد. سپس با استفاده از روش تحلیلی رایلی-ریتز، مقدار بار کمانش خمشی-پیچشی با توجه به شرایط مرزی حاکم بر عضو محاسبه می‌شود. پس از تأیید صحت و دقت روش ارائه شده با استفاده از نرم افزار المان محدود انسیس، تاثیر عوامل مهمی مانند پیش بارگذاری محوری، خروج از مرکزیت بار محوری فشاری، جنس الیاف، چینش لایه‌ها، شرایط مرزی و ضرایب باریک‌شوندگی بال و جان بر ظرفیت کمانشی عضو کامپوزیتی مدنظر بررسی می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Buckling analysis of tapered laminated composite channel-section beam-columns subjected to combined axial load and end moment

نویسندگان [English]

  • Reza Abolghasemian 1
  • Masoumeh Soltani 2
  • Ahmad Reza Ghasemi 1
1 Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
2 Department of Civil Engineering, Faculty of Engineering, University of Kashan, Kashan, Iran
چکیده [English]

Nowadays, the practical applications of shell elements such as beams having thin-wall cross-sections are increasing greatly in various fields of engineering including aerospace, nuclear, marine, and automotive industries. This is due to their ability to optimally use structural materials and simultaneously reduce the total weight of the structure. Fiber polymer composites also have different conspicuous properties such as high stiffness-to-weight and strength-to-weight ratios, corrosion resistance, and high strength. Therefore, laminated composite C-section beam elements simultaneously possess both the beneficial features of fiber-reinforced composite materials and thin-walled cross-sections at the same time. Motivated by these facts, in this research, the flexural-torsional stability of multi-layer fibrous composite tapered beam-columns with channel-section subjected to axial and bending loads is investigated. For this purpose, the total potential energy governing the problem is extracted based on Vlasov’s model for small non-uniform torsion along with the classical laminated plate theory. Then, using Ritz’s methodology as an analytical solution technique, the endurable buckling load is calculated. Eventually, the effect of important parameters such as stacking sequences, fiber composite materials, boundary conditions, axial load eccentricity, and axial preloading on the linear buckling capacity of double-tapered multi-layer composite beam-column with channel-section under axial load and end moment is investigated.

کلیدواژه‌ها [English]

  • Flexural-torsional stability
  • Composite tapered member
  • C-shaped cross-section
  • Classical lamination theory
  • Ritz’s method

مراجع

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نشریه مهندسی مکانیک امیرکبیر
دوره 55، شماره 4
تیر 1402
صفحه 515-542

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