بارگذاری انفجاری مکرر روی ورق‌های مستطیلی تقویت شده با خط جوش: بررسی تجربی و مدلسازی با شبکه عصبی GMDH

نوع مقاله : مکانیک جامدات

نویسندگان

1 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه گیلان، گیلان، ایران

2 نویسنده مسئول: دانشیار، دانشکده مهندسی مکانیک، دانشگاه گیلان، گیلان، ایران

3 استادیار، دانشکده مهندسی مکانیک، دانشگاه ایوانکی، سمنان، ایران

چکیده

در این پژوهش، به بررسی تغییر شکل بزرگ پلاستیک ورق‌های مستطیلی فولادی تحت بارگذاری انفجاری مکرر پرداخته‌شده است. در این راستا، آزمایش‌های روی سه ساختار مختلف تقویت نشده، تقویت‌شده با یک و دو خط جوش انجام‌شده است. جهت بررسی مودهای تغییر شکل و مکانیسم شکست نمونه‌های آزمایشی، بار دینامیکی در محدوده‌ای گسترده با استفاده از جرم خرج‌های ۲۵، ۳۵، ۴۵ و ۵۰ گرم تا ۳ مرتبه اعمال شد. مشاهدات تجربی بیان می‌کند که با افزایش جرم خرج، مودهای تغییر شکل اول (a) و اول (b) در جرم خرج‌ بالاتر و در تکرار بارگذاری در شماره بالاتر مشاهده می‌شود. در ورق تقویت نشده در بارگذاری سوم با جرم خرج ۲۵ گرم، حالت اول (a) شکست مشاهده می‌شود؛ اما این مود شکست در نمونه تقویت‌شده با یک و دو خط جوش به ترتیب در تکرار سوم در جرم خرج ۳۵ گرم و ۴۵ گرم مشاهده می‌شود. این موضوع نشان‌دهنده تأثیر خط جوش بر تغییرات مود شکست است. علاوه بر این، در بخش مدل‌سازی عددی، از شبکه عصبی برای ارائه یک مدل ریاضی بر مبنای اعداد بی‌بعد جهت پیش‌بینی بیشترین خیز دائمی نمونه‌های آزمایشی استفاده شد. نتایج به‌دست‌آمده نشان داد که توافق خوبی بین مدل ارائه‌شده با مقادیر تجربی برقرار است به‌طوری‌که هر دو ساختار در محدوده خطای کمتر از 10% قرار گرفتند.

کلیدواژه‌ها


عنوان مقاله [English]

Uniform Blast Loading on Stiffened Rectangular Plates by Welding Line: Experimental Investigation and Modelling Using GMDH Neural Network

نویسندگان [English]

  • Mansoor Behtaj 1
  • Hashem Babaei 2
  • Tohid Mirzababaie Mostofi 3
1 Ph.D. Student, Faculty of Mechanical Engineering, University of Guilan, Tehran, Iran
2 Corresponding author: Associate Professor, Faculty of Mechanical Engineering, University of Guilan, Tehran, Iran
3 Assistant Professor, Faculty of Mechanical Engineering, University of Eyvanekey, Semnan, Iran
چکیده [English]

In the present study, the dynamic response of rectangular steel plates under repeated impulsive loading was investigated. In this regard, experiments were performed on three different structures: unstiffened, stiffened with one and two welding lines. To investigate the deformation modes and the failure mechanism of the experimental specimens, dynamic loads in a wide range were applied up to 3 loads by 25, 35, 45, and 50 g charge masses. Experimental observations demonstrate that with increasing charge mass, the Mode Ia and Mode Ib are observed in a higher charge mass and loading repetitions in a higher number. For the unstiffened plate, at the 3rd load with a mass of 25g, a change Mode Ia is observed, however, the same deformation mode occurs for the stiffened plate with a single and two weld lines at the 3rd blast load by 35g and 45 g charge mass, respectively. These observations indicate the effect of the weld line and its numbers on the variation of failure modes. Furthermore, in the numerical modeling section, the Group Method of Data Handling (GMDH) neural network was used to present a mathematical model based on dimensionless numbers to predict the maximum permanent deflection of tested specimens. Good agreement between the proposed model and the corresponding experimental results is obtained and all data points are within the ±10% error range for every two patterns.

کلیدواژه‌ها [English]

  • Blast loading
  • Repeated loading
  • Stiffened plate
  • Welding line
  • Modelling

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دوره 18، شماره 2 - شماره پیاپی 68
شماره پیاپی 68، فصلنامه تابستان
مرداد 1401
صفحه 15-35
  • تاریخ دریافت: 18 شهریور 1400
  • تاریخ بازنگری: 15 دی 1400
  • تاریخ پذیرش: 20 دی 1400
  • تاریخ انتشار: 01 مرداد 1401