Hedayatian, M., Vahedi, K. (2016). Analytical and numerical modeling of erosive projectiles into steel fiber reinforced concrete target. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(2), 231-244.
Mehdi Hedayatian; Khodadade Vahedi. "Analytical and numerical modeling of erosive projectiles into steel fiber reinforced concrete target". Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9, 2, 2016, 231-244.
Hedayatian, M., Vahedi, K. (2016). 'Analytical and numerical modeling of erosive projectiles into steel fiber reinforced concrete target', Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 9(2), pp. 231-244.
Hedayatian, M., Vahedi, K. Analytical and numerical modeling of erosive projectiles into steel fiber reinforced concrete target. Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering, 2016; 9(2): 231-244.
Analytical and numerical modeling of erosive projectiles into steel fiber reinforced concrete target
1MSc Student, Department of Mechanical Engineering, College of Engineering, Arak Branch, Islamic Azad University, Arak, Iran.
2Associate Professor, Department of Mechanical Engineering, Imam Hossein University, Tehran, Iran.
Abstract
In this paper, modeling of high speed projectiles with different nose shapes, penetrating into steel fiber reinforced concrete is investigated. This is a novel study because it considers the length to diameter ratio of steel fiber as well as projectile length to diameter ratio and volume fraction of fiber used in concrete matrix on the impact resistance of steel fiber reinforced concrete fibers at high speeds. Numerical simulation is used using LS-DYNA explicit code. The projectiles have an approximate mass of 45 (gr) and their velocities are about 2500 (m/s) penetrating into steel fiber reinforced concrete panel with volume fraction of 1.0%, 1.5% and 2.0%. In this article the exact behavior of steel fiber reinforced concrete confronting metallic projectiles at high speed is predicted. The results of the simulations are compared with experimental work of other investigators and, the results show that ogive nose projectiles are more efficient than other projectiles. In other words, by increasing the projectile length to diameter ratio from 0.5 to 0.9, for flat, hemispherical and ogive projectiles their residual velocities are increased. Also, it is shown that by increasing the volume fraction of steel fibers in concrete matrix, damage of top surface damage is reduced dramatically. The analytical model presented in this paper considers the speed variations of the projectile during the penetration process into steel fiber reinforced concrete is an important achievements this respect.
مدل سازی تحلیلی و عددی پرتابه های فرسایشی در اهداف تقویت شده بتنی به الیاف فولادی
Authors [Persian]
مهدی هدایتیان1; خداداد وواحدی2
1دانشجوی دکترای مهندسی مکانیک، دانشگاه آزاد اسلامی واحد اراک، اراک
2دانشیار مهندسی مکانیک، دانشگاه امام حسین، تهران
Abstract [Persian]
در این مقاله به ارائه یک مدل تحلیلی فرآیند نفوذ پرتابه های فرسایشی در بتن تقویت شده به الیاف فولادی پرداخته شده است. نوآوری مدل تحلیلی ارائه شده در آن است که تاثیر طول به قطر الیاف فولادی و نسبت طول به قطر پرتابه و همچنین درصد حجمی الیاف استفاده شده در ماتریس بتن بر روی مقاومت ضربه ای بتن الیافی در سرعت های بالا مورد توجه قرار گرفته است.در شبیه سازی عددی از کد صریح و غیر خطی ال اس داینا استفاده شده است. پرتابه ها با سرعت 2500 متر بر ثانیه با جرم تقریبی 45 گرم و با سر نفوذگر نیم کروی، تخت و اجایو در بتن مسلح به الیاف فولادی با درصد های حجمی 1، 5/1 و 2 درصد نفوذ میکنند. پس از صحت سنجی مدل تحلیلی نفوذ با فرآیند شبیه سازی و کار آزمایشگاهی، نتایج نشان میدهد که پرتابه های با سر نفوذگر اجایو که فاکتور تیزی سر پرتابه پایینی دارد با سرعت باقیمانده بیشتری از اهداف خارج میشود و کارآیی آنها در نفوذ بهتر میباشد. به عبارت دیگر با افزایش نسبت طول به قطر پرتابه از 5/0 به 9/0، برای پرتابه هایی به ترتیب به شکل تخت، نیم کروی و اجایو، سرعت باقی مانده افزایش می یابد. همچنین با افزایش درصد حجمی الیاف فولادی در ماتریس بتن میزان تخریب سطح ناحیه رویی و زیرین بتن الیافی کاهش مییابد. مدل تحلیلی ارائه شده در فرآیند تغییرات سرعت پرتابه در حین نفوذ داخل بتن تقویت شده به الیاف فولادی از دستاوردهای مهم این تحقیق محسوب میشود.
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