تحلیل عددی نفوذ خرج گود در اهداف بتنی گسسته با استفاده از نرم‌افزارهای ال اس داینا و انسیس-اتوداین

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، برق و کامپیوتر، واحد علوم و تحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه صنعتی شریف، تهران، ایران

3 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک ، دانشگاه تربیت مدرس، تهران، ایران

4 دکتری، دانشکده مهندسی مکانیک ، دانشگاه صنعتی مالک اشتر، تهران، ایران

5 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک ، دانشگاه صنعتی مالک اشتر، تهران، ایران

6 گروه مهندسی مکانیک، دانشکده مهندسی مکانیک، دانشگاه تهران، تهران، ایران

چکیده

یکی از روش‌های ایمن‌سازی اهداف بتنی در برابر تهدیدهای خرج گود، گسسته‌سازی آن‌ها است. هدف از این پژوهش شبیه‌سازی فرآیند نفوذ خرج گود در اهداف بتنی گسسته، در دو نرم‌افزار ال‌اس‌داینا و انسیس-اتوداین است. بدین منظور، فرآیند شبیه‌سازی برای یکی از نتایج تجربی موجود، انجام شده و نتایج بدست‌آمده در هر دو نرم‌افزار، صحت‌سنجی شده‌اند. در انتها نتایج دو نرم‌افزار در زمینه‌های سرعت جت، عمق نفوذ، قطر دهانه ورودی، میانی، خروجی و زمان اجرا مقایسه شده‌است. استفاده از روش آ-ال-ای برای فرآیند شکل‌گیری جت، و مدل آر-اچ-تی برای شبیه‌سازی رفتار بتن در نرخ کرنش‌های بالا نتایج مناسبی در هر دو نرم‌افزار بدست داد. تفاوت‌های روش برهم‌کنش المان‌های لاگرانژی و اویلری در دو نرم‌افزار، باعث شد تا عمق نفوذ بدست‌آمده در انسیس-اتوداین، از ال‌اس‌داینا کمتر و قطر دهانه‌های ورودی، خروجی و میانی در انسیس-اتوداین نسبت به ال‌اس‌داینا بیشتر باشد. عمق نفوذ در ال‌اس‌داینا، و قطر دهانه‌های ورودی، خروجی و میانی در انسیس-اتوداین به نتایج تجربی نزدیک‌تر بودند. شبیه‌سازی بتن پیوسته نیز انجام شد و مشاهده گردید که عمق نفوذ خرج گود در بتن گسسته از بتن پیوسته کمتر است. نتایج بدست‌آمده نشان از تطابق خوب نتایج دو نرم‌افزار با مقادیر تجربی دارد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Numerical analysis of shaped charge jet penetration into discrete concrete targets using LS-DYNA and ANSYS-AUTODYN

نویسندگان [English]

  • Hossein Mehmannavaz 1
  • Ali Ramezani 2
  • gholamhossain Liaghat 3
  • hamid fazeli 4
  • Mohsen Rouhbakhsh 5
  • Mohammad Amin Nabakhteh 6
1 Mechanical Engineering Department, Mechanical, Electrical and Computer Engineering faculty, Science and Research branch, Islamic Azad University, Tehran, Iran
2 Mechanical Engineering Department, Mechanical Engineering faculty, Sharif University of Technology, Tehran, Iran
3 Mechanical Engineering Department, Mechanical Engineering faculty, Tarbiat Modares University, Tehran, Iran
4 PhD, Mechanical Engineering Department, Mechanical Engineering faculty, Malek Ashtar University.
5 Mechanical Engineering Department, Mechanical Engineering faculty, Malek Ashtar University, Tehran, Iran
6 Mechanical Engineering Department, Mechanical Engineering faculty, Tehran University, Tehran, Iran
چکیده [English]

Discrete concrete targets show more resistance to penetration against shaped charges. The purpose of this study is to simulate the penetration of shaped charge in discrete concrete targets using LS-DYNA and ANSYS-AUTODYN and compare the results. For this purpose, the simulation process for one of the experimental results is performed and the results obtained from both software are validated. Finally, the results of two software in the fields of jet velocity, penetration depth, entry diameters, middle and exit crater, and run time are compared. Application of the ALE method for jet elements and the RHT concrete model to simulate the concrete behavior at high strain rates yielded good results. Differences in numerical solution method and command differences in the interaction of the Lagrangian and Eulerian elements in two software caused the depth of penetration in ANSYS-AUTODYN to be less than the LS-DYNA and the diameters of entry, middle and exit crater in ANSYS-AUTODYN become larger than the LS-DYNA and closer to the experimental results. The results of the two software are in good agreement with the experimental results. Continuous concrete was also simulated and it was found that the penetration depth of discrete concrete was lower than continuous concrete. 

کلیدواژه‌ها [English]

  • Shaped Charge
  • Discrete Concrete Targets
  • Numerical Analysis
  • LS-DYNA
  • ANSYS-AUTODYN
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