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相关概念视频

Generalized Hooke's Law01:22

Generalized Hooke's Law

963
The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
963
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
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
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

221
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...
221
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

199
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
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A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
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多种类型的二维FeAs具有高的异构性.

Jongbum Won1,2, Jihong Bae1,2, Hyesoo Kim1,2

  • 1Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea.

Nano letters
|December 4, 2023
PubMed
概括

研究人员合成了新的2D多态铁化物 (FeAs) 晶体,实现了明显的晶体对称性和不存在于散装FeAs中的异构性质. 这扩展了具有控制对称性的2D材料库.

关键词:
巴尼格豪森的树木两层之间的合器.铁化物是一种铁化物.多种类型主义 (Polytypism) 是一种形式主义.两维材料是一种二维材料.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 固态物理 固态物理
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 化学成分通常决定2D晶体生长中的晶体结构.
  • 在不改变元素组成的情况下,合成具有特定对称度和格子参数的新2D晶体具有挑战性.
  • 现有的二维材料通常缺乏给定化学配方的多种晶体对称性.

研究的目的:

  • 提出一种用于合成具有受控晶体对称性的二维多态铁化物 (FeAs) 晶体的策略.
  • 探索对称运算符的独立控制,如镜子和滑翔平面,在2D晶体生长中.
  • 为了研究这些新的2D FeAs多种类型所产生的异构性质.

主要方法:

  • 2D多态FeAs晶体的合成,专注于堆叠序列 (多型) 的变化.
  • 结晶学结构的表征,包括空间组 (例如,I4/mmm中的2Q-FeAs,P4/nmm中的1Q-FeAs).
  • 测量异性质的物理性质,包括电导率,扬模和摩擦系数.

主要成果:

  • 成功制备了具有明显多种类型的2D多态FeAs晶体,与散装形FeAs (Pnma) 不同.
  • 独立控制对称元素,如镜面 (2Q-FeAs) 和滑翔平面 (1Q-FeAs).
  • 与散装FeAs相比,在2D FeAs中观察到显著的异构性质,包括电导率,扬模和摩擦,与散装FeAs相比.

结论:

  • 多种类型的2D FeAs的合成提供了一种方法,可以从单一的化学成分中获得多种晶体对称性.
  • 这种方法使对称性运算符的独立调成为可能,为材料设计提供了新的可能性.
  • 该研究建立了一个概念,通过控制晶体对称性独立于化学成分来扩大二维材料库.