بررسی تأثیر چرخش محوری پرتابه اجایو کالیبر کوچک بر پارامترهای نفوذ در اهداف بتنی به‌روش المان‌محدود
Authors
Abstract:
In the field of the penetration of kinetic energy projectiles into concrete slabs, scientists have focused on using gas guns. As most of the projectiles have a rotation because they fired from grooved barrels, the penetration theory of them into concrete targets has not to be mentioned. Knowing the residual velocity of the rotating projectiles is important in designing of the civil and military structures. In this paper, the rotation effects of 7.62 mm and 12.7 mm projectiles on the penetration depth, the scabbing diameter, and the carter diameter of a concrete slab have numerically founded. The validation of numerical analyses has to compare with penetration depths of Forrestal tests. Moreover, the mesh dependency has checked before that. The results showed that this effect could influence the residual velocity up to 8.4 % and 13.1% for 7.62 mm and 12.7 mm projectiles respectively. However, for the penetration depths, these values are 2 % and 3.5 %, respectively. In addition, in order to use the maximum principal strain as an erosion criterion, a relation has founded.
similar resources
بررسی تحلیلی و عددی نفوذ پرتابه میله‌ای بلند در اهداف بتنی و بتن- فولادی (علمی-پژوهشی)
Penetration into non-homogeneous concrete- steel target is of prime importance to applied scients and civilian analyzers. Due to complexly of the problem, most of the work done in this experimental in nature. In this Study, an analytical solution of long rod projectile penetrating depth into concrete targets with applying the analytical model of Alekseeveskiis-Tate, and for concrete/steel targe...
full textتحلیل نفوذ پرتابه های صلب در اهداف بتنی بر مبنای تئوری انتشار موج شوک (علمی- ترویجی)
Due to the importance of concrete structures, the field of projectile penetration into concrete targets has attracted increasing research efforts. Gao et al. presented a new method for penetration analysis into concrete targets. Propagation of shock waves due to impact is the base of this method. The aim of the present study is to investigate and modify this model. In this research, first a bri...
full textتحلیل تجربی و عددی نفوذ سرجنگی پیشرو پرتابه های دو مرحله ای در اهداف بتنی محدود
In this paper, the penetration process of the follow warhead in anti structure tandem projectiles is investigated by numerical and experimental methods. These projectiles are usually shaped charge or EFP. In the follow projectile, geometry and material are considered as the two main parameters. Numerical modeling of the problem has been performed in AUTODYN code. The numerical results have ...
full textبررسی مدلهای نفوذ پرتابه در اهداف فلزی و سرامیکی
نفوذ پرتابه در اهداف ترکیبی یکی از موضوع های مهم و اساسی در علم مکانیک است. نفوذ پرتابه در این مقاله در سه بخش بررسی شده است. بخش اول مربوط به مدلهای نفوذ در فلزها، بخش دوم مربوط به مدلهای نفوذ با اعداد بی‌بعد و بخش سوم مربوط به نفوذ در سرامیک‌ها است. در بخش اول علاوه بر مرور مدلهای تحلیلی نفوذ، دسته‌بندی و خلاصه آنها نیز بیان‌شده است. مدل‌ها شامل معادله پانسلت، تئوری هیدرودینامیک، تئوری هی...
full textMy Resources
Journal title
volume 17 issue 2
pages 115- 127
publication date 2022-09
By following a journal you will be notified via email when a new issue of this journal is published.
No Keywords
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023