نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، مهندسی مکانیک، دانشگاه یزد، یزد، ایران

2 استاد، دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران

چکیده

در این مقاله خصوصیات جذب انرژی پروفیل مخروطی با هسته ساندویچی در برخورد مورب با دیواره سخت با روش المان محدود غیرخطی مورد بررسی قرار می­گیرد. میزان جذب انرژی در این فرآیند تا حد زیادی به اثر برهم کنش بین هسته ساندویچی و دیواره خارجی، و همچنین جنس و هندسه موادی که وارد ناحیه تغییر شکل پلاستیک می­شوند بستگی دارد. بدین منظور ویژگی­های مربوط به جذب انرژی و تأثیر پارامتر زاویه برخورد و ضخامت مورد توجه است. به‌منظور کاهش هزینه محاسباتی در مدل‌سازی مچالگی بر پایه نتایج حاصل از روش المان محدود، توابع درجه سه جذب انرژی مخصوص و ماکزیمم نیروی مچالگی با استفاده از روش پاسخ سطح تعیین می­شوند. نتایج حاصل از تحلیل برخورد نشان می­دهند که با افزایش زاویه برخورد و کاهش ضخامت پروفیل مخروطی هسته ساندویچی، جذب انرژی مخصوص کاهش می­یابد. همچنین، با افزایش زاویه برخورد و افزایش ضخامت، بیشینه نیروی مچالگی کاهش می­یابد. در ادامه، بهینه­سازی چندهدفه برای بیشینه کردن جذب انرژی مخصوص و کمینه کردن بیشینه نیروی مچالگی اعمال می‌شود. مسأله بهینه­سازی دوم در جهت بیشینه شدن همزمان جذب انرژی مخصوص و زاویه برخورد می­باشد. در بخش نهایی، آنالیز حساسیت موضعی و جامع برای توابع جذب انرژی مخصوص و ماکزیمم نیروی مچالگی بر حسب پارامترهای مورد مطالعه زاویه برخورد و ضخامت مطالعه شده است. نتایج نشان می­دهند که حساسیت جامع تابع جذب انرژی مخصوص نسبت به زاویه برخورد بیشتر از ضخامت پروفیل می­باشد، در حالیکه حساسیت جامع تابع بیشینه نیروی مچالگی نسبت به ضخامت بیشتر از زاویه برخورد است.

کلیدواژه‌ها

عنوان مقاله [English]

Oblique crashworthiness optimization and sensitivity analysis of tapered sandwich columns

نویسندگان [English]

  • Nader Vahdatazad 1
  • Saeed Ebrahimi 1
  • Gholamhossein Liaghat 2

1 Department of Mechanical Engineering, Yazd University, Yazd, Iran

2 Department of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran

چکیده [English]

In this paper, crashworthiness analysis of a tapered sandwich column under oblique impact loading against a rigid wall is investigated by nonlinear finite element analysis.The energy absorption characteristics of honeycomb sandwich cylindrical columns in oblique crushing process depend greatly on the amount of material which participates in the plastic deformation. The interaction effects between the honeycomb and column walls greatly improve the energy absorption efficiency. The response surface method with cubic basis functions is employed to formulate specific energy absorption and peak crushing force, which reduces considerably the computational cost of crush simulations by finite element method. Based on the results of crash modeling, it is observed that the specific energy absorption has a decreasing trend by increasing the impact angle and decreasing the column thickness. On the other hand, the peek crushing force reduces when the impact angle and the column thickness are increased. Therefore, multiobjective optimization is done to maximize the specific energy absorption and minimize the peek crushing force at the same time. Furthermore, maximizing the specific energy absorption and maximizing impact load angle is performed. Finally, both local and global sensitivity analyses are employed to assess the effect of impact angle and thickness on the specific energy absorption and peak crushing force. The global sensitivity of the specific energy absorption with respect to the impact angle is observed to be more than the column thickness, while the peak crushing force has more global sensitivity to the column thickness compared to the impact angle.

کلیدواژه‌ها [English]

  • Tapered Sandwich columns
  • specific energy absorption
  • crashworthiness
  • Multiobjective Optimization
  • Sensitivity analysis
 
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