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فصلنامه علمی کارافن

تحلیل عددی و تجربی تولید لوله‌های کامپوزیتی جدار نازک آلومینیوم 5000 و 7000 با استفاده از روش اکستروژن

نوع مقاله : مقاله پژوهشی (کاربردی)

نویسندگان
1 دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی، واحد تبریز، تبریز، ایران.
2 گروه مهندسی مکانیک، دانشگاه ملی مهارت، تهران، ایران.
چکیده
در این پژوهش، فرایند اکستروژن مستقیم برای تولید لوله‌های کامپوزیتی جدار نازک از آلیاژهای آلومینیوم سری 5000 و 7000 به‌صورت عددی و تجربی مورد بررسی قرار گرفت. برای این منظور، قالبی با سنبه شناور طراحی و ساخته شد و آزمایش‌ها در دماهای 200 و 300 درجه سانتی‌گراد و سرعت پیستون 3 متر بر دقیقه بر روی دستگاه پرس هیدرولیکی 300 تنی انجام شد. در شبیه‌سازی عددی با روش المان محدود، توزیع تنش مؤثر، کرنش مؤثر و تغییرات ضخامت پوسته و هسته مورد تحلیل قرار گرفت. نتایج نشان داد که در دمای 200 درجه، بیشینه تنش مؤثر حدود 348 مگاپاسکال و کرنش مؤثر 29/3 است، در حالی‌که با افزایش دما به 300 درجه، این مقادیر به‌ترتیب به 188 مگاپاسکال و 65/2 کاهش یافت. سختی‌سنجی برینل مقدار 108 برینل را برای پوسته و 65 برینل را برای هسته نشان داد که بیانگر پیوند متالورژیکی مناسب میان دو آلیاژ است. مشاهدات متالوگرافی، ساختار دانه‌های کشیده و ریز را در ناحیه مرزی آشکار کرد. نتایج عددی و تجربی هم‌راستا بوده و نشان دادند که انتخاب دمای بهینه حدود 250 درجه‌سانتی‌گراد و طراحی دقیق قالب، موجب یکنواختی سیلان ماده و افزایش کیفیت اتصال می‌شود. این تحقیق قابلیت تولید موفق لوله‌های آلومینیومی دو فلزی سبک را برای کاربردهای هوافضا و صنایع انرژی تأیید می‌کند.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Numerical and Experimental Investigation of Thin-Walled Bimetallic Aluminum Tubes (AA5000/AA7000) Fabricated by the Direct Extrusion Process

نویسندگان English

Hossein Jafarzadeh 1
Elyas Haddadi 2
1 Department of Mechanical Engineering, Ta C., Islamic Azad University, Tabriz branch, Tabriz, Iran.
2 Department of Mechanical Engineering, Technical and Vocational University (TVU), Tehran, Iran.
چکیده English

In this study, the direct extrusion process was numerically and experimentally investigated to produce thin-walled bimetallic aluminum tubes composed of AA5000 and AA7000 alloys. A floating- punch extrusion die was designed and fabricated, and experiments were performed on a 300-ton hydraulic press at temperatures of 200°C and 300°C with a ram speed of 3 m/min. Finite element analysis (FEA) was employed to evaluate the equivalent stress, strain, and wall thickness distribution in both core and shell regions. Results indicated that at 200°C, the maximum equivalent stress reached 348 MPa and the equivalent strain was 3.29, while at 300°C, these values decreased to 188 MPa and 2.65, respectively. The Brinell hardness test revealed a gradient from 108 HB in the outer shell to 65 HB in the inner core, indicating proper metallurgical bonding. Metallographic analysis confirmed fine, elongated grains along the extrusion direction, particularly at the interface. Both experimental and simulation results consistently demonstrated that selecting an optimal forming temperature of around 250°C ensures uniform material flow and prevents interfacial defects. This study confirms the feasibility of manufacturing lightweight, high-strength aluminum bimetallic tubes for aerospace and energy applications.

کلیدواژه‌ها English

Extrusion process
Bimetallic tubes
Aluminum alloys 5000 and 7000
Finite element analysis
Thin-walled composites
Microhardness
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دوره 23، شماره 3
فنی و مهندسی
پاییز 1405

  • تاریخ دریافت 27 آبان 1404
  • تاریخ بازنگری 26 فروردین 1405
  • تاریخ پذیرش 12 مهر 1405