بررسی و مقایسه نظری و عددی تاثیر اینرسی در رفتار فروریزش جاذب مشبک تک سلولی و دو سلولی تحت بارگذاری ضربه ای

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مکانیک، دانشکده فنی و مهندسی، دانشگاه لرستان، لرستان، ایران

2 دانشکده مهندسی مکانیک، دانشگاه سمنان، سمنان، ایران

چکیده

در این تحقیق به بررسی و مقایسه نظری و عددی رفتار دینامیکی یک مدل متشکل از چهار میله و چهار مفصل الاستیک-پلاستیک تحت اثرات اینرسی در دو حالت تک سلولی و دو سلولی پرداخته شده است. بررسی نظری پس از پیاده‌سازی فرضیات و به دست آوردن معادلات دینامیکی حرکت، به صورت حل دستگاه معادلات غیرخطی در نرم افزار متلب و بررسی عددی به وسیله نرم افزار اجزا محدود آباکوس صورت گرفته است. در این تحقیق، هدف به دست آوردن رابطه جذب انرژی برحسب پارامتر اینرسی روی سازه مشبک تحت بارگذاری ضرب های و نیز بررسی رفتار دینامیکی پارامترهای موثر و سازوکار فروریزشی سازه در دو حالت تک سلولی و دو سلولی خواهد بود. در نهایت به تحلیل و بررسی تأثیر دو سلولی در نظر گرفتن جاذب، در مقادیر پارامترهای مؤثر در پاسخ رفتار دینامیکی پرداخته شد. از نتایج به دست آمده مشاهده شد که فروریزش جاذب به صورت متقارن دو سویه خواهد بود. همچنین مقایسه و بررسی نتایج درستی فرضیات و رو شهای به کار رفته را در هر دو حالت تک سلولی و دو سلولی به اثبات می‌رساند.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Theoretical and Numerical Study and Comparison of the Inertia Effects on the Collapse Behavior of Expanded metal tube Absorber with Single and Double Cell under Impact Loading

نویسندگان [English]

  • H. Hatami 1
  • A.B. Fathollahi 2
1 Mechanical Engineering department, Engineering Faculty, Lorestan University, Khorram-Abad, Iran
2 Mechanical Engineering department, Semnan University, Semnan, Iran
چکیده [English]

The present study provides the theoretical and numerical comparison and study of the dynamic behavior of a four-rod and four-elastic-plastic joint model under the inertia effects in both single and double cell modes. The theoretical study was carried out by solving nonlinear equations in MATLAB with dynamic equations of motion. Numerical analysis was also carried out with ABAQUS. The objective of this study is to derive the equation of energy absorption in terms of the inertia parameter to the expanded metal tube structure under impact loading and also to study the dynamic behavior of effective parameters and collapse mechanism of the structure in both single and double cell modes. Finally, the analysis of the effect of double cell absorber was carried out for the values of effective parameters in dynamic response. The results show that the collapse of the absorber will be symmetric in two directions.

کلیدواژه‌ها [English]

  • Expanded metal
  • Impact
  • Inertia
  • Absorber
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