بررسی اثر چسبندگی بین دو سطح بر کار نیروی اصطکاک و سایش در مقیاس نانو با استفاده از دینامیک مولکولی

نوع مقاله : مکانیک جامدات

نویسنده

نویسنده مسئول: استادیار، گروه خلبانی دانشگاه امام علی(ع)، تهران، ایران

چکیده

در این پژوهش، با بهره‌گیری از دینامیک مولکولی اثر چسبندگی بر میزان حذف و جدا شدن مواد در طی فرایند خراش در مقیاس نانو و به روش عددی با کمک آزمون نانو خراش موردمطالعه قرارگرفته است. در این شبیه‌سازی، آزمون خراش با استفاده از یک سری تنظیمات مجازی بر یک زیرلایه صاف با ساختار مکعبی وجوه پر تک‌بلور و یک قلم خراش مخروطی با نوک کروی با عمق‌های خراش 0، 3، 7 و 10 آنگستروم انجام‌شده است. از پتانسیل کلاسیک بین‌اتمی لنارد-جونز برای مدل‌سازی و تنظیم چسبندگی بین اتم‌های قلم و زیرلایه استفاده‌شده است که این چسبندگی‌های در نظر گرفته‌شده از 5 تا 70 درصد قدرت چسبندگی بین‌اتمی اتم‌های آلومینیوم هست. با این کار اثر ماده روانکار بدون مدل‌سازی آن موردبررسی قرار می‌گیرد. باوجوداینکه بررسی تأثیر چسبندگی به‌طور مداوم در مطالعات گذشته صرف‌نظر می‌شده، اما مشاهده‌شده است که در خراش با عمق‌های کمتر، کار چسبان اثر قابل‌توجهی بر کار اصطکاک و سایش خواهد داشت. شایان‌ذکر است که در این مطالعه به دلیل اینکه اثر شکل‌پذیری اصلی‌ترین مکانیسم سایش بوده است، مطابق با مشاهدات تجربی کار اصطکاک و سایش باهم رابطه‌ای خطی دارند.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of the Effect of Adhesion Between Two Surfaces on the Frictional Work and Wear at the Nanoscale Using Molecular Dynamics

نویسنده [English]

  • Mir Abolfazl Mokhtari
Corresponding author: Assistant Professor, Department of Aviation, Imam Ali University, Tehran, Iran
چکیده [English]

In this study, using Molecular Dynamics (MD) simulations, the effect of adhesion on the removal and separation of materials during the nano-scale scratching process has been studied numerically using the nano-scratching test. The virtual setup simulates the scratching of a flat substrate made of a single crystalline aluminum using a rigid conical indenter with a blunted spherical tip (radius of 20 nm) at four different scratching depths (i.e., 0, 3, 7 and 10 A) was studied. The classical Lenard-Jones interatomic potential is used to model and regulate the adhesion between the atoms of the pen and the substrate, which is 5 to 70% of the interatomic adhesion strength of aluminum atoms. This mimics the effect of the lubricant without modeling it. Although the effect of adhesion has been consistently neglected in previous studies, it has been observed that in scratches with shallower depths, the adhesive will have a significant effect on friction and wear. It is worth noting that in this study, because the effect of plasticity was the main mechanism of wear, according to experimental observations, friction and wear have a linear relationship with each other.

کلیدواژه‌ها [English]

  • Adhesive wear
  • Abrasive wear
  • Frictional work
  • Ploughing work
  • Nano-scratching
  • Molecular dynamics

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دوره 18، شماره 1 - شماره پیاپی 67
شماره پیاپی 67، فصلنامه بهار
خرداد 1401
صفحه 161-169
  • تاریخ دریافت: 01 شهریور 1400
  • تاریخ بازنگری: 03 آبان 1400
  • تاریخ پذیرش: 11 آبان 1400
  • تاریخ انتشار: 01 اردیبهشت 1401