تحلیل کمانش و پس‌کمانش لوله کامپوزیتی تقویت شده با آلیاژ حافظه‌دار تحت فشار داخلی

نوع مقاله : مقاله علمی

نویسندگان
علیرضا پورموید 1
محمدعلی رنجبر 2
سیدمرتضی سیدنژاد 3
1 دانشیار، دانشکده مهندسی مکانیک، دانشگاه پدافند هوایی خاتم الانبیاء (ص)، تهران، ایران
2 استادیار، دانشکده مهندسی مکانیک، دانشگاه پدافند هوایی خاتم الانبیاء (ص)، تهران، ایران
3 کارشناس ارشد، دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران
10.22034/stme.2025.544309.1165
چکیده
این پژوهش به بررسی رفتار کمانش و پس‌کمانش لوله‌های کامپوزیتی تحت فشار داخلی، با تمرکز بر تأثیر حضور سیم‌های نایتینول با اثر حافظه‌شکلی در بهبود ظرفیت مکانیکی و کنترل پس‌کمانش می‌پردازد. لوله‌ها از جنس کامپوزیت کربن-اپوکسی T300/5208 ساخته شده و به روش الیاف پیچی با لایه چینی ]55-/55[ تولید شدند. سیم‌های حافظه‌دار تحت پیش‌کرنش 5% در چند لایه جاسازی شدند تا نیروی فشاری در برابر تنش‌های پسماند کششی ناشی از پخت ایجاد کنند و عملکرد مکانیکی لوله‌ها را تقویت نمایند. سه نمونه شامل لوله بدون سیم حافظه‌دار و بدون فشار داخلی، لوله بدون سیم حافظه‌دار تحت فشار داخلی و لوله تقویت‌شده با سیم حافظه‌دار تحت فشار داخلی در نرم‌افزار آباکوس تحلیل شدند. تحلیل کمانش با استفاده از حل‌گر اغتشاش خطی، کمانش و بررسی پنج مود اول انجام شد؛ تحلیل پس‌کمانش با حل‌گر استاتیکی عمومی غیرخطی و اعمال انحراف اولیه مطابق مود I صورت گرفت. نتایج نشان داد که حضور سیم حافظه‌دار موجب افزایش کمتر از 1% نیروی بحرانی کمانش و افزایش 20% ظرفیت فشار داخلی لوله‌ها می‌شود، بدون آن‌که رفتار پس‌کمانش تحت‌فشار داخلی تغییر منفی پیدا کند. این یافته‌ها نشان می‌دهد که استفاده از آلیاژ حافظه‌دار می‌تواند یک راهکار مؤثر و عملی برای بهبود عملکرد مکانیکی و افزایش ظرفیت فشار لوله‌های کامپوزیتی، به ویژه در کاربردهای صنعتی و سازه‌های پیشرفته باشد.
کلیدواژه‌ها
لوله‌های کامپوزیتی
رفتار کمانش
رفتار پس‌کمانش
آلیاژ حافظه‌دار
فشار داخلی
موضوعات

عنوان مقاله English

Buckling and Post-Buckling Analysis of Composite Pipe Reinforced with Shape Memory Alloy under Internal Pressure

نویسندگان English

Alireza Pourmoayed 1
Mohammad Ali Ranjbar 2
Seyed Morteza Seyednejad 3
1 Associate professor, Department of Mechanical Engineering, Khatamul-Anbiya Air Defense University, Tehran, Iran
2 Assistant professor, Department of Mechanical Engineering, Khatamul-Anbiya Air Defense University, Tehran, Iran
3 M.Sc, Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

This study investigates the buckling and post-buckling behavior of composite pipes under internal pressure, with a focus on the effect of embedding NiTi wires with shape memory alloy (SMA) effect on improving mechanical capacity and controlling post-buckling. The pipes were made of carbon/epoxy composite (T300/5208) and fabricated using a filament winding process with a [−55/55] layup. Shape memory wires under 5% prestrain were embedded in multiple layers to provide compressive force against residual tensile stresses caused by curing and to enhance the mechanical performance of the tubes. Three models were analyzed using Abaqus software: a pipe without SMA and internal pressure, a pressurized pipe without SMA, and a pressurized SMA-reinforced pipe. Buckling analysis using a linear perturbation solver and examining the first five buckling modes was performed; then, post-buckling analysis using a general nonlinear static solver and applying initial deflection according to mode I was performed. The results showed that the presence of the memory wire increased the critical buckling force by less than 1% and increased the internal pressure capacity of the pipes by 20%, without negatively changing the post-buckling behavior under internal pressure. These findings indicate that the use of shape memory alloys can be an effective and practical solution for improving the mechanical performance and increasing the pressure capacity of composite pipes, especially in industrial applications and advanced structures.

کلیدواژه‌ها English

Composite pipes
buckling behavior
post-buckling behavior
shape memory alloy
internal pressure

اصل مقاله

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