在不平衡的表面生长过程中最大限度地降低内在粗度.
Pablo M Amorim1, Edwin E Mozo Luis2, Fernando F Dall'Agnol3
1Universidade Federal da Bahia, Instituto de Física, Campus Universitário da Federação, Rua Barão de Jeremoabo s/n, 40170-115 Salvador, Bahia, Brazil.
Physical review. E
|August 19, 2025
概括
转换平均高度配置 (TMHP) 技术有效地将随机表面的内在粗度降到最低. 这种方法可以更准确地描述全球和本地粗度,解决表面增长分析中的问题.
科学领域:
- 表面科学是一门科学.
- 统计物理学的统计物理.
- 材料科学是一种材料科学.
背景情况:
- 在不平衡增长过程中形成的随机表面由于局部波动而表现出内在的粗性.
- 准确地描述全球和本地粗度对于理解表面生长动态至关重要.
- 现有的方法很难有效地抑制短波长波动,同时保持基本的接口特征.
研究的目的:
- 通过分析证明,转换平均高度配置 (TMHP) 技术可以最大限度地降低内在粗度.
- 为了证明TMHP能够减少空间缩放校正以提高粗度表征的能力.
- 为了验证TMHP的有效性,使用两维 (d=2) 的弹性沉积 (BD) 模型来验证TMHP的有效性.
主要方法:
- 分析证明TMHP的粗度最小化属性.
- 在d=2基板上的弹性沉积 (BD) 模型上应用TMHP.
- 使用最佳垃圾箱大小的TMHP确定局部粗度指数.
主要成果:
- 在分析上,TMHP最大限度地降低了内在粗度,并减少了空间缩放校正.
- TMHP有效地抑制了短波长波动,同时保留了更长波长的接口特征.
- 在d=2中对BD模型的应用产生了与全球粗度估计相一致的局部粗度指数.
结论:
- TMHP提供了一种更准确的方法来描述随机表面的全球和本地粗度.
- 该研究解决了在d=2.2.中的弹道沉积模型的缩放分析中长期存在的差距.
- TMHP 能够保留基本接口特征,这使得它对表面生长研究具有价值.
相关概念视频
Stress Concentrations
834
Stress concentration is when stress intensifies near discontinuities such as holes or abrupt cross-sectional changes in a structural member. This localized stress can often surpass the average stress within the member. The stress distribution in flat bars, either with a circular hole or varying widths connected by fillets, can be determined experimentally using a photoelastic method. The results are based on ratios of geometric parameters like the ratio of the hole's radius to the smaller...
834
Deformations in a Transverse Cross Section
716
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
716
Stress Concentrations
813
The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress...
The stress...
813
Plastic Deformations
741
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
741
Distribution of Stresses in a Narrow Rectangular Beam
726
In studying beam stress distribution, examining an elemental section is essential. To determine the average shearing stress on this face, the calculated shear is divided by the surface area. Importantly, shearing stresses on the beam's transverse and horizontal planes mirror each other, indicating a consistent stress distribution along the upper region of the beam. Notably, shearing stresses are absent at the beam's upper and lower surfaces due to the absence of applied forces in these...
726
Principal Stresses in a Beam
905
In prismatic beams subject to arbitrary transverse loading, It is essential to analyze the interaction between shear forces and bending moments in order to understand stress distribution and ensure structural integrity. The highest normal or bending stress occurs at the outer fibers of the beam, decreasing linearly to zero at the neutral axis. In contrast, shear stress peaks at the neutral axis and diminishes toward the outer surfaces.
Analyzing principal stresses is crucial, especially in...
Analyzing principal stresses is crucial, especially in...
905


