مدل‌سازی عددی و تحلیلی انحراف بزرگ همراه با فرورفتگی موضعی تیر ساندویچی تحت بارگذاری عرضی شبه استاتیکی

نوع مقاله : مقاله مکانیک

نویسنده

گروه مهندسی مکانیک، دانشگاه بوعلی سینا، همدان، ایران

چکیده

با درنظرگرفتن اثر فرورفتگی موضعی (محلی) و هم‌چنین مقاومت هسته فوم روی روند کلی انحراف تیر ساندویچی، یک مدل تحلیلی و عددی جدید برای اندازه‌گیری تغییر شکل­های بزرگ همراه با فرورفتگی موضعی یک تیر ساندویچی تحت بارگذاری عرضی شبه استاتیکی بررسی شده است. مدل‌های تحلیلی و عددی برای بررسی نیروی فشاری عرضی و انرژی پلاستیک کل ارائه شده است و نتایج تحلیلی با نتایج عددی مطابقت دارد. با بررسی و مقایسه نتایج مدل تحلیلی و عددی می‌توان نتیجه گرفت هنگامی‌که بیش‌ترین انحراف ساندویچ تیر از ضخامت لایه‌ها بیش‌تر باشد، فاز (مرحله) فرورفتگی موضعی نقش مهمی در انحراف فروپاشی اولیه ساندویچ تیر دارد. هم‌چنین با بررسی نتایج مدل تحلیلی انرژی پلاستیکی کل با و بدون درنظرگرفتن  فاز فرورفتگی موضعی مقایسه شده است و نشان می‌دهد که اگر فاز فرورفتگی موضعی در نظر گرفته نشود، کل انرژی پلاستیکی ساندویچ تیر بیش از حد مجاز خواهد شد. در مدل تحلیلی ارائه شده در این مقاله، رفتار انحراف با فرورفتگی موضعی تیر ساندویچی بررسی شده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical and Analytical Modeling of Large Deflection with Local Indentation of Sandwich Beam Under Quasi-Static Transverse Loading

نویسنده [English]

  • Mohammad Solooki
Department of Mechanical Engineering, Bu Ali Sina University, Hammedan, Iran
چکیده [English]

By taking local indention effect and foam core strength into account in the overall deflection process, a novel theoretical model is investigated to predict the large deflection with local indentation of sandwich beam under quasi-static lateral loading. The theoretical and numerical models of lateral crushing force and total plastic energy are proposed and the theoretical results agree well with numerical and experimental results of previous researches. The results conclude that local indention phase plays an important role in initial collapse deflection of sandwich beam when maximum deflection is greater than face sheets thickness. In addition, the theoretical results with and without local indention phase of total plastic energy are compared and it shows that total plastic energy of sandwich beam will be overestimated if local indention phase is neglected. The present analytical model can predict the large deflection behavior with local indention of sandwich beam reasonably.

کلیدواژه‌ها [English]

  • Sandwich structures
  • Plastic deformation
  • Analytical modeling
  • Numerical analysis
  • Local indentation
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