تغییر شکل پلاستیک ورق‌های چندلایه فلزی هم‌جنس و غیر هم‌جنس با چگالی سطحی ثابت تحت بارگذاری دفعی مکرر

نوع مقاله : مکانیک ضربه

نویسندگان

1 پژوهشگر، دانشکده فنی مهندسی، دانشگاه جامع امام حسین(ع)، تهران، ایران

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

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

4 استاد، دانشکده مهندسی مکانیک، دانشگاه ایوان‌کی، ایوان‌کی، ایران

چکیده

در پژوهش حاضر، مکانیسم تغییر شکل بزرگ پلاستیک ورق‌های دایره‌ای تک و چندلایه فلزی هم‌جنس و غیر هم‌جنس با چگالی سطحی ثابت تحت بارگذاری دفعی مکرر یکنواخت موردبررسی قرارگرفته است. از سامانه پاندول بالستیک به همراه لوله استقرار خرج 200 میلی‌متری برای اعمال بار انفجاری به نمونه استفاده شد. 40 نمونه آزمایشی در سه لایه‌بندی مختلف تک، دو و سه لایه با هشت چیدمان مختلف در نظر شد. برای ایجاد شرایط بارگذاری و آزمایشی یکسان، از 10 گرم ماده منفجره پلاستیکی استفاده شد و پاسخ دینامیکی هر سازه تا 5 بار بارگذاری مکرر موردمطالعه قرار گرفت. نتایج آزمایشگاهی حاکی از تغییر شکل بزرگ پلاستیک همراه با نازک شدگی در مرزهای گیردار و همچنین پاره شدن برخی آزمایش‌ها است. همچنین نتایج نشان داد که با افزایش تعداد دفعات انفجار، بیشترین خیز دائمی ورق‌ها افزایش می‌یابد و با افزایش تعداد انفجارها، خیز پیش‌رونده ورق در مرکز آن به‌صورت نمایی کاهش می‌یابد. علاوه بر این، قرارگیری یک لایه ضخیم در جلو و پشتیبانی یک سازه با لایه نازک‌تر عملکرد بهتری به نمونه آزمایشی در برابر بار انفجاری مکرر می‌بخشد. نتیجه به‌دست‌آمده برای ساختارهای چندلایه هم‌جنس کاملاً مطابق با نتایج ساختارهای غیر هم‌جنس است.

کلیدواژه‌ها


عنوان مقاله [English]

Plastic Deformation of Similar and Dissimilar Multi-layered Metallic Plates with the Same Areal Density Subjected to Repeated Impulsive Loading

نویسندگان [English]

  • Mojtaba Ziya-Shamami 1
  • Hashem Babaei 2
  • Tohid Mirzababaie Mostofi 3
  • Hossein Khodarahmi 4
1 Researcher, Faculty of Technical Engineering, Imam Hossein University, Tehran, Iran
2 Corresponding author: Associate Professor, Faculty of Mechanical Engineering, Gilan University, Gilan, Iran
3 Assistant Professor, Faculty of Mechanical Engineering, Ivankay University, Ivankay, Iran
4 Professor, Faculty of Mechanical Engineering, Ivankay University, Ivankay, Iran
چکیده [English]

In the current research study, the large plastic deformations of similar and dissimilar single- and multi-layered metallic plates with the same areal density under repeated uniform impulsive loading have been investigated. The ballistic pendulum along a 200 mm length standoff blast tube was used to apply the blast load on the specimen. Forty testing specimen in three different layering configurations including single-, double, and triple-layered, and eight different arrangements were considered. For the same loading and experimental condition, 10 g plastic explosive was utilized and the dynamic response of structures was studied up to five consecutive loads. The experimental results indicated large plastic global deformation with thinning happening at the clamped boundary and also tearing for some experiments. The results also represented that the maximum permanent deflections of plates were increased by the number of blast loads and the progressive deflection of the plates at the center was decreased exponentially with increasing the number of blasts. Placing a thick front layer a thin back layer gives better blast performance to the tested specimen against repeated impulsive loading. The obtained result for multi-layered configurations with the same material is completely consistent with those structures made of dissimilar layers.

کلیدواژه‌ها [English]

  • Repeated loading
  • Impulsive loading
  • Multi-layered mixed configuration
  • Circular plate
  • Maximum displacement

Smiley face

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دوره 18، شماره 1 - شماره پیاپی 67
شماره پیاپی 67، فصلنامه بهار
خرداد 1401
صفحه 137-159
  • تاریخ دریافت: 26 مرداد 1400
  • تاریخ بازنگری: 18 مهر 1400
  • تاریخ پذیرش: 24 مهر 1400
  • تاریخ انتشار: 01 اردیبهشت 1401