تأثیر دما و اکسیداسیون سطحی بر پارامترهای مختلف مکانیکی ورق‌های نازک آلومینیومی

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه مهندسی عمران، دانشکده مهندسی، دانشگاه بوعلی سینا، همدان، ایران

چکیده

ورق‌های آلومینیومی با توجه ‌به خواص ویژه خود از جمله چگالی پایین و شکل‌پذیری بالا دارای کاربردهای متنوع در صنایع مختلف هستند. با توجه به پیشرفت‌های صورت گرفته در زمینه ساخت ورق‌های آلومینیومی، در حال حاضر امکان تولید این قطعات با ضخامت‌های بسیار پایین حتی در مقیاس نانو فراهم شده است. از این رو در این پژوهش به بررسی رفتار مکانیکی این مواد با استفاده از شبیه‌سازی عددی بر مبنای روش دینامیک مولکولی پرداخته می‌شود. با توجه ‌به واکنش‌پذیری بالای آلومینیوم در مجاورت اکسیژن، مدل‌سازی اولیه بر اساس مدل هسته فلزی و پوسته اکسید فلزی صورت می‌پذیرد که در آن امکان بررسی تأثیر ضخامت‌های مختلف لایه اکسید سطحی بر رفتار مکانیکی ورق‌های نازک آلومینیومی امکان‌پذیر است. پس از ایجاد ساختار اولیه، نمونه‌ها تحت شرایط محیطی پایدارسازی شده و انرژی آن‌ها کمینه‌سازی می‌شود. به منظور بررسی رفتار مکانیکی، نمونه‌ها تحت آزمون‌های مختلف مکانیکی ارزیابی شده و پارامترهای مختلف مکانیکی آن‌ها از جمله مدول یانگ، مدول بالک، مدول برشی و درایه‌های مختلف ماتریس خواص ماده در دماهای مختلف اندازه‌گیری می‌شود. دقت مدل‌سازی‌های صورت گرفته از شبیه‌سازی عددی با نتایج آزمایشگاهی موجود صحت‌سنجی می‌شود. بر اساس نتایج عددی، روابطی تحلیلی برای تعیین پارامترهای مختلف مکانیکی ورق‌های نازک آلومینیومی با ضخامت‌های مختلف از لایه اکسیداسیون سطحی در دماهای مختلف ارائه شد. مقایسه روابط تحلیلی به دست آمده با داده‌های آزمایشگاهی، بیانگر دقت مناسب آن‌ها و همچنین قابلیت تعمیم‌پذیری روابط حاصل به ورق‌های آلومینیومی با ابعاد میکرو و ماکرو است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Impression of Temperature and Oxide Layer Thickness on the Mechanical Characteristics of Aluminum ultra-thin film

نویسندگان [English]

  • Hossein Abbasi
  • Amir Rezaei Sameti
Department of Civil Engineering, Faculty of Engineering, Bu-Ali Sina University, Hamedan, Hamedan, Iran
چکیده [English]

Thin aluminum films have various applications in different industries because of their special properties, including low density and high ductility. Due to the progress in the manufacturing process, it is now possible to produce ultra-thin aluminum films with very low thickness, even on the nanoscale. This paper aims to numerically investigate the mechanical behavior of ultra-thin aluminum films using the molecular dynamics (MD) method. Because of the high reactivity of aluminum in the vicinity of oxygen, the representative volume elements (RVEs) of the aluminum film are simulated based on the aluminum core-alumina shell model to study the effect of different thicknesses of the surface oxide layer. In order to stabilize the atomistic RVEs under environmental conditions, the relaxation process is applied, and the total energy of the system is minimized. Then, the relaxed configuration of RVEs is analyzed under different mechanical tests, and their different mechanical parameters such as Young's modulus, bulk modulus, shear modulus, and different material characteristics are calculated at different temperatures. The accuracy of the numerical simulations is validated by comparing the results with the experimental data. Based on the MD results, analytical relations are presented to determine the different mechanical parameters of thin aluminum films as a function of the oxide layer thickness and ambient temperature. Comparison of the proposed analytical relations with the experimental data, demonstrates their capability and generalizability for the micro- and macro-size aluminum sheets.

کلیدواژه‌ها [English]

  • Thin aluminum films
  • Mechanical parameters
  • Molecular dynamics method
  • Effects of temperature
  • oxide layer thickness

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