Study of the normal force and velocity influence on the fused silica scratching mechanisms with a-alumina grit at atomic scale via Reaxff reactive molecular dynamic simulations
Study of the normal force and velocity influence on the fused silica scratching mechanisms with a-alumina grit at atomic scale via Reaxff reactive molecular dynamic simulations
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DOI：
10.1504/ijat.2024.10060762
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发表时间：
2024
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通讯作者：
Yasemin Akar;Frakie F. Jackson;Rakesh Mishra;Hongyu Li;David D. Walker;Guoyu Yu;Philippe Gambron;Xun Chen;Luke Mason;Juan Ignacio Ahuir Torres;Paul A. Bingham
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文献类型：
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作者：
Yasemin Akar;Frakie F. Jackson;Rakesh Mishra;Hongyu Li;David D. Walker;Guoyu Yu;Philippe Gambron;Xun Chen;Luke Mason;Juan Ignacio Ahuir Torres;Paul A. Bingham
熔融石英是一种光学玻璃材料，应用于许多行业，通常对其进行研磨和抛光以获得超光滑的表面。α-氧化铝常用于获得该表面。划痕试验是一种有效的工艺条件评估技术，可引起工艺损伤。施加在磨料上的法向力和滑动速度是刮擦试验中需要考虑的主要参数。虽然熔融二氧化硅的刮擦力学机理已经有了深入的研究，但其化学机理的分析却很少。本文采用Reaxff反应分子动力学模拟，研究了不同速度和法向载荷下各种划痕过程的力学和化学机理。结果表明，根据速度和法向力的不同，划痕的类型不同（穿透、带拖曳的穿透和拖曳）。法向力越大，速度越慢，划痕深度越大。
: The fused silica is an optical glass material employed in several industries, which is usually grinded and polished to obtained ultra-smooth surface. α-alumina is often employed to get this surface. The scratching testing is a powerful technique to assess the process conditions that provoke the process induced damages. Normal force applied on abrasives and sliding velocity are main parameters to be considered in the scratching testing. Although the scratching mechanical mechanisms of the fused silica have previously been studied in depth, its chemical mechanisms have poorly been analysed. In this paper, the Reaxff reactive molecular dynamic simulation is used to study these mechanical and chemical mechanisms in various scratching processes under different velocities and normal loads. The results showed dissimilar types of scratching (penetration, penetration with dragging and dragging) according to the velocity and normal force. The scratching depth was higher at larger normal force and slower velocity.