مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

جذب انرژی در لوله‌های جدار نازک آگزتیک یکنواخت و مدرج تابعی هندسی: مطالعه تجربی و عددی تحت بارگذاری شبه‌استاتیک

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران
10.48311/mme.2026.117400.82880
چکیده
هدف از این پژوهش، بررسی‌ تجربی و عددی جذب انرژی لوله‌های مربعی مشبک با توزیع یکنواخت و مدرج تابعی هندسی از سلول‌های آگزتیک درون‌رو است. سه نمونه آزمایشگاهی از جنس فولاد ضد زنگ 304 با استفاده از دستگاه برش لیزری دوار ساخته شدند. این نمونه‌ها شامل دو لوله آگزتیک با توزیع یکنواخت و یک لوله آگزتیک با توزیع مدرج تابعی هندسی سلول‌ها بود. آزمایش‌های فشار محوری شبه‌استاتیک بر روی آن‌ها با استفاده از دستگاه تست یونیورسال 300 کیلونیوتن صورت گرفت. شبیه‌سازی‌های عددی با نرم‌افزار آباکوس انجام و نتایج حاصل با داده‌های تجربی اعتبارسنجی گردید. تأثیر زوایه سلول و ضخامت دیواره سلول بر ظرفیت جذب انرژی لوله‌های آگزتیک با توزیع یکنواخت سلول با روش عددی مورد ارزیابی قرار گرفت. علاوه بر این، جذب انرژی لوله‌های آگزتیک مربعی با سه نوع توزیع مدرج تابعی هندسی سلول‌های آگزتیک، با بهره‌گیری از روش اجزای محدود بررسی شد. پارامترهای ارزیابی برای تحلیل، شامل جذب انرژی، جذب انرژی ویژه، نیروی بیشینه‌‌ی اولیه و راندمان نیروی لهیدگی است. توزیع مدرج تابعی هندسی سلول‌های آگزتیک در مقایسه با توزیع یکنواخت سلول‌ها، منجر به بهبود پارمترهای ارزیابی در لوله‌های مشبک شد. به طور خاص، لوله‌ی مدرج با بهینه‌ترین عملکرد (Gt-Re45t1.0t1.6) در مقایسه با لوله یکنواخت با بهترین عملکرد (Ut-Re45t1.4t1.4)، 56 درصد جذب انرژی بیشتر و 65 درصد جذب انرژی ویژه بیشتر داشت. علاوه بر این، راندمان نیروی لهیدگی آن 165 درصد بالاتر و نیروی بیشینه‌ی اولیه آن 41 درصد کمتر بود.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Energy Absorption in Uniform and Functionally Geometrically Graded Auxetic Thin-Walled Tubes: An Experimental and Numerical Study Under Quasi-Static Loading

نویسندگان English

Mosayeb Najar
Rahmatollah ghajar
Faculty of Mechanical Engineering, K.N. Toosi University of Technology, Tehran, Iran
چکیده English

This study aims to experimentally and numerically investigate the energy absorption of square lattice tubes with uniform and functionally geometrically graded distributions of re-entrant auxetic cells. Three stainless steel 304 specimens were fabricated using a rotary laser cutting machine. These specimens included two auxetic tubes with uniform cell distribution and one with a functionally geometrically graded cell distribution. Quasi-static axial compression tests were conducted on the specimens using a 300 kN universal testing machine. Numerical simulations were performed using Abaqus, and the results were validated against experimental data. The influence of cell angle and cell-wall thickness on the energy absorption capacity of uniformly distributed auxetic tubes was evaluated numerically. Additionally, the energy absorption of square auxetic tubes with three types of functionally geometrically graded auxetic cell distributions was investigated using the finite element method. The evaluation parameters for analysis are energy absorption, specific energy absorption, initial peak force, and crushing force efficiency. The functionally geometrically graded distributions of auxetic cells improved the evaluation parameters relative to uniform cell distributions in lattice tubes. Specifically, the optimally performing graded tube (Gt-Re45t1.0t1.6) exhibited 56% higher energy absorption and 65% higher specific energy absorption compared to the best-performing uniform tube (Ut-Re45t1.4t1.4). Furthermore, its crushing force efficiency was 165% higher, while the initial peak force was 41% lower.

کلیدواژه‌ها English

Auxetic
Specific Energy Absorption
Functionally Geometrically Graded
Uniform Tube
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