تغییرشکل پلاستیک ورق‌های آلومینیومی با روکش پلیمری تحت بارگذاری انفجار مخلوط گازها: بخش اول: مطالعات تجربی

نوع مقاله: مقاله مستقل

نویسندگان

1 گروه مهندسی مکانیک، دانشکده فنی و مهندسی، ایوان کی، دانشگاه ایوان کی، گرمسار، ایران

2 استادیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران

چکیده

در این تحقیق، از یک فرآیند شکل‌دهی نوین به نام روش انفجار مخلوط گازها برای تغییر شکل بزرگ ورق‌های نازک مستطیلی آلومینیومی با روکش پلیمری استفاده‌شده است. بر اساس این ایده جدید، یک مجموعه آزمایش روی رفتار پلاستیک ساختارهای دولایه فلز-پلیمری با هدف افزایش آستانه تحمل بار دفعی انجام‌شده است. در این ساختارها، از روکش پلیمری پلی‌اوره با ضخامت‌های مختلف 3 و 4 میلی‌متری به‌عنوان یک لایه تقویت‌کننده برای ورق‌های آلومینیومی استفاده‌شده است. در این سری از آزمایش‌ها، اثر ضخامت لایه‌های عقبی و جلویی بر رفتار ساختار دولایه فلز-پلیمری تحت پنج بار دفعی مختلف موردمطالعه قرارگرفته است. نتایج تجربی نشان داد که افزودن روکش پلیمری با ضخامت‌های 3 و 4 میلی‌متر به ورق آلومینیومی 2 میلی‌متری به ترتیب موجب کاهش خیز دائمی ساختار به میزان %7/12 و %1/21 در ایمپالس N·s 1/19، %2/22 و %9/30 در ایمپالس N·s 1/28 و در نهایت %3/23 و %3/31 در ایمپالس N·s 3/32 می‌شود. برای ورق‌های آلومینیومی با ضخامت 1 میلی‌متر، استفاده از روکش پلیمری 3 و 4 میلی‌متری، به ترتیب موجب 1/2 و 4/2 برابر کردن آستانه تحمل بار دفعی می‌شود.

کلیدواژه‌ها

موضوعات


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