مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی مودهای تغییر شکل و مکانیسم شکست ورق‌های چهارگوش جوش شده تحت بارگذاری انفجاری مکرر

نوع مقاله : پژوهشی اصیل

نویسندگان
1 دانشجوی دکتری، گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران.
2 دانشیار، گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه گیلان، رشت، ایران
3 استادیار، گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران.
چکیده
در پژوهش حاضر، به بررسی تجربی پاسخ دینامیکی و تغییر شکل بزرگ پلاستیک ورق‌های مستطیلی فولادی تحت بارگذاری انفجاری مکرر با سامانه آونگ بالستیک پرداخته‌شده است. در این راستا، آزمایش‌های روی سه ساختار مختلف جوش نشده، جوش‌شده با یک خط جوش و جوش‌شده با 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 از نوع PE4 یا C4 اعمال شد. همچنین، جهت بررسی رفتار سازه تحت بارگذاری مکرر، آزمایش‌ها تا ۳ مرتبه بارگذاری ادامه پیدا کرد. مشاهدات تجربی بیان می‌کند که با افزایش جرم خرج، مودهای تغییر شکل غیر الاستیک بزرگ همراه با نازک شدگی و همچنین پارگی نمونه در جرم خرج‌های بالاتر و در تکرار بارگذاری در شماره‌های بالاتر مشاهده می‌شود. در ورق تقویت نشده در بارگذاری سوم با جرم خرج ۲۵ گرم، تغییر مود تغییر شکل (تغییر شکل غیر الاستیک بزرگ همراه با گلویی شدن جزئی) مشاهده می‌شود؛ اما در نمونه تقویت‌شده با یک خط در تکرار سوم در جرم خرج ۳۵ گرم همان مود تغییر شکل اتفاق می‌افتد. در نمونه تقویت‌شده با دو خط جوش نیز همان مود شکست در تکرار سوم ۴۵ گرم مشاهده می‌شود. این موضوع نشان‌دهنده تأثیر خط جوش و تعداد آن‌ها بر تغییرات مود تغییر شکل و مکانسیم شکست است. نتیجه به‌دست‌آمده یکی از اهداف اصلی مقاله حاضر بوده که نشان دهد بهره‌گیری از خط جوش و چینش آن چگونه روی مود تغییر شکل و مکانیسم شکست ورق فولادی اثر می‌گذارد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

An experimental investigation into deformation modes and failure mechanism of welded rectangular plates under repeated blast loading

نویسندگان English

Mansour Behtaj 1
Hashem Babaei 2
Tohid Mirzababaie Mostofi 3
1 Ph.D. Candidate, Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.
2 Associate Professor, Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Guilan, Rasht, Iran.
3 Assistant Professor, Department of Mechanical Engineering, Faculty of Mechanical Engineering, University of Eyvanekey, Eyvanekey, Iran.
چکیده English

In this paper, the dynamic response of steel plates under repeated blast loading using a ballistic pendulum system were investigated. In this regard, experiments were performed on three different configurations: unwelded, welded with single and double welding lines. To apply the dynamic load in a wide range, the plastic explosive charge (C4) in different masses of 25, 35, 45, and 50 g were used. Besides, to investigate the behavior of the structure under repeated loading, experiments were tested on up to 3 loads. Experimental observations demonstrate that with increasing charge mass, the large inelastic deformation with necking and tensile tearing around of the boundary were observed in higher charge masses and loading repetitions in higher numbers. For the unwelded plate, at the 3rd load with a charge mass of 25g, a change in the failure mode was observed (large inelastic deformation with necking around part of the boundary), however, for the welded plate with a single weld line, the same deformation mode occurred at the 3rd blast load by the charge mass of 35g. For the welded plate with two weld lines, the same failure mode was observed at the 3rd blast load by the charge mass of 45g. These observations indicate the effect of the weld line and its numbers on the variation of failure modes. The obtained result is one of the main objectives of the present study to show how using welding lines and their arrangements affect the deformation mode and the failure mechanism of steel plates.

کلیدواژه‌ها English

Repeated blast loading
Welded steel plate
Experimental Study
deformation mode
Failure mechanism
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