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相关概念视频

Transformation of Plane Strain01:12

Transformation of Plane Strain

168
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
168
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

270
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
270
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

219
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
219
Normal Strain under Axial Loading01:20

Normal Strain under Axial Loading

474
Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...
474
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

154
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
154
Measurements of Strain01:27

Measurements of Strain

957
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
957

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相关实验视频

Updated: Jul 8, 2025

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy
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在MXene上通过应变工程打破线性缩放关系,以促进N2电还原.

Ying Li1, Dongyue Gao1, Chengchun Tang1

  • 1Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.

Journal of colloid and interface science
|December 15, 2023
PubMed
概括

应变工程克服了缩反应 (NRR) 电催化剂的局限性. 这一策略打破了扩展关系,提高了有效合成氨的活性和选择性.

关键词:
密度函数理论密度函数理论电化学N(2) 降解方法莫) 3C) 2) ) ) ) ) ) )合成NH(3) 的合成.应变工程是一种应变工程.

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科学领域:

  • 电触媒溶解是一种电触媒.
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 降解反应 (NRR) 电催化剂对于氨合成至关重要.
  • 介质之间的线性缩放关系限制了催化剂的性能.
  • 开发高活性和选择性的NRR催化剂仍然是一个挑战.

研究的目的:

  • 引入应变工程作为一种克服NRR扩展关系的策略.
  • 研究应变对NRR机制和中间吸附的影响.
  • 设计具有增强活性和选择性的优质NRR催化剂.

主要方法:

  • 在MXene催化剂上建模应变效应的理论计算.
  • 对N2吸附配置和激活机制 ("P-P"和"E-E") 的分析.
  • 关键中间体 (NH2NH2**,NH2*) 的吸附能量的评估.

主要成果:

  • 应变工程成功地打破了NRR中的线性缩放关系.
  • 在应变下,N-N键长度的相反变化照亮了不同的N2激活路径.
  • 在应力MXene上实现了0.25V的低限制电位 (UL) 和高法拉第效率 (FE).
  • 应变调节的电子结构被确定为提高性能的来源.
  • 在压力下证明了MXene的催化可持续性.

结论:

  • 应变工程是设计高性能NRR电催化剂的有效方法.
  • 这种方法绕过了活动选择性权衡,使得有效的氨生产成为可能.
  • 提供了关于应变对催化机制的影响的基本见解.
  • 为先进的NRR催化剂的合理设计铺平了道路.