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بررسی تحلیلی و عددی نفوذ پرتابه با دماغه دوپله در اهداف بتنی و با در نظر گرفتن اصطکاک | ||
| پدافند غیرعامل | ||
| دوره 13، شماره 1 - شماره پیاپی 49، خرداد 1401، صفحه 33-46 اصل مقاله (940.58 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| نویسندگان | ||
| ابوذر ملکیان* 1؛ خداداد واحدی2؛ علیرضا نداف اسکویی3؛ روح اله حسینی4 | ||
| 1دانشجوی دکتری، مهندسی مکانیک، دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
| 2استاد، مهندسی مکانیک، دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
| 3دانشیار، مهندسی مکانیک، دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
| 4استادیار، مهندسی مکانیک دانشگاه جامع امام حسین(ع)، تهران، ایران | ||
| تاریخ دریافت: 25 تیر 1400، تاریخ بازنگری: 18 بهمن 1400، تاریخ پذیرش: 19 بهمن 1400 | ||
| چکیده | ||
| در این مطالعه، نفوذ پرتابه جنبشی با دماغه دوپله در اهداف بتنی با در نظر گرفتن تأثیر سرعت بر پدیده اصطکاک میان پرتابه و هدف بررسی شده است. جهت محاسبه عمق نفوذ، از روش‌های حل عددی و حل المان محدود شده استفاده شده است. در روش حل عددی با انتگرال‌گیری از تنش در سطح دماغه و محاسبه نیروی وارد بر دماغه پرتابه در حال نفوذ، عمق نفوذ پرتابه با استفاده از قانون دوم نیوتن و استفاده از روش‌های عددی حل معادلات دیفرانسیل حاصل محاسبه شده است. در روش المان محدود از مدل ساختاریConcrete Damaged Plasticity جهت مدل کردن رفتار بتن و در هر دو روش المان محدود و روش حل عددی از مدل کاهش نمایی استاتیکی-دینامیکی جهت مدل کردن نیروی اصطکاک وارد بر پرتابه استفاده شده است. جهت مقایسه بازدهی مدل عمق نفوذ استفاده شده در مطالعه، عمق نفوذ چند نوع دماغه اجایو با کالیبرهای مختلف با استفاده از مدل مذکور در ضرایب اصطکاک ثابت و نمایی محاسبه و با داده‌های آزمایشگاهی موجود مقایسه شده است. عمق نفوذ محاسبه شده با استفاده از ضریب اصطکاک نمایی تطابق بهتری نسبت به حالت استفاده از ضرایب اصطکاک ثابت در یک طیف گسترده سرعت دارد. در این مطالعه همچنین، عمق نفوذ دماغه‌های بهینه‌سازی شده در مطالعات پیشین و دماغه اجایو با کالیبر شعاع سر 3 با عمق نفوذ دماغه دوپله با استفاده از حل المان محدود مقایسه گشته است. در نظر گرفتن تأثیر سرعت بر ضریب اصطکاک میان پرتابه و هدف، باعث افزایش قابل توجه دقت محاسبات سرعت در پژوهش حاضر شده است. | ||
| کلیدواژه‌ها | ||
| عمق نفوذ؛ اهداف بتنی؛ روش المان محدود؛ دماغه دوپله؛ اصطکاک | ||
| عنوان مقاله [English] | ||
| Analytical and numerical Study of the Penetration Depth of Double Nose Rigid Projectiles in Concrete Targets by Considering the Friction | ||
| نویسندگان [English] | ||
| Abouzar Malekiyan1؛ khodadad vahedi2؛ alireza Naddaf Oskoyi3؛ Rohhollah Hosseyni4 | ||
| 1Student of Emam Hossein Univercity | ||
| 2full professor of mechanic engineering department of emam Hossein University | ||
| 3Associate Professor, Faculty of Mechanical Engineering, Imam Hossein University | ||
| 4r.hosseini.mech@gmail.comMechanical Engineering, Imam Hossein University | ||
| چکیده [English] | ||
| In this study the kinetic projectile with double nose in concrete targets by considering the velocity effect on friction between projectile and target is investigated. Numerical methods and finite element solution were used to calculate the depth of the penetration. In the numerical solution method, by integrating the stress at the nose surface and calculating the force on the nose of the penetrating projectile, the penetration depth of the projectile was calculated using Newton's second law and numerical methods were used to solve the resulting differential equations. In the finite element method, the Concrete damaged plasticity structural model was used to model the behavior of concrete, and in both the finite element method and the numerical solution method, the static-dynamic exponential reduction model is used to model the frictional force on the projectile. In order to develop the penetration depth equations, the parameters and equations related to the exponential friction coefficient have been considered and the two-step nose penetration depth equation has been developed by considering different parameters. To validate the proposed model, the results of experimental projectile penetration tests with the shape of the nose of other researchers have been used. Considering the effect of speed on the coefficient of friction between the projectile and the target has significantly increased the accuracy of speed calculations in this research. | ||
| کلیدواژه‌ها [English] | ||
| Penetration Depth, Concrete Targets, Finite Element Method, Two-Step Nose, Friction | ||
| مراجع | ||
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