تغییرشکل پلاستیک ورق‌های آلومینیومی با روکش پلیمری تحت بارگذاری انفجار مخلوط گازها: بخش دوم: مدل‌سازی تحلیلی و تجربی

نوع مقاله: مقاله مستقل

نویسندگان

1 مدرس، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران

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

چکیده

در این تحقیق، ابتدا یک سری آزمایش برای ارزیابی تغییر شکل پلاستیک ورق‌های مستطیلی آلومینیومی تقویت شده با پوشش پلیمری تحت بارگذاری انفجار مخلوط گاز انجام شد. برای بررسی اثر ضخامت لایه جلویی و عقبی بر مقاومت در برابر تغییر شکل ساختارهای دولایه فلز-پلیمری، چهار نوع لایه‌بندی مختلف انتخاب شدند. در مدل‌سازی تحلیلی، مدلی برای پیش‌بینی بیشترین خیز دائمی ساختار دولایه فلز-پلیمری ارائه شد. همچنین، در مدل‌سازی تجربی، با بی‌بعد سازی معادلات حاکم بر ورق بر مبنای تحلیل ابعادی، تعدادی عدد بی‌بعد ارائه شد که هر عدد بی‌بعد بیان‌گر هندسه ساختار، نسبت بار دینامیکی اعمالی به مقاومت ماده و توانایی مقاومت دینامیکی ماده در برابر تغییر شکل پلاستیک است. با تبدیل داده‌های تجربی به فرم اعداد بی‌بعد و استفاده از روش تجزیه مقادیر منفرد، توابعی ریاضی برای پیش‌بینی بیشترین خیز دائمی ساختار ارائه شد. سپس، مدل‌های تجربی ارائه‌شده با نتایج تجربی صورت گرفته صحه‌گذاری شد. نتایج بدست آمده نشان‌دهنده توافق بسیار خوب نتایج آزمایش‌ها و پیش‌بینی مدل‌سازی از لحاظ بیشترین خیز دائمی است

کلیدواژه‌ها

موضوعات


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