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相关概念视频

Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

140
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...
140
Generalized Hooke's Law01:22

Generalized Hooke's Law

844
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...
844
Three-Dimensional Analysis of Strain01:29

Three-Dimensional Analysis of Strain

203
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...
203
Transformation of Plane Strain01:12

Transformation of Plane Strain

158
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...
158
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

251
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.
251

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通过应变分布诱导的多度梯度骨状纳米复合材料.

Di Wang1, Shouhua Feng1, Ming Yang1

  • 1State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China.

ACS nano
|October 19, 2024
PubMed
概括

研究人员通过控制应变,制造出具有复杂梯度的骨类纳米复合材料. 这种仿生方法产生了具有可调节的机械性能和自我愈合能力的材料,其灵感来源于天然的骨结构.

科学领域:

  • 材料科学 材料科学 材料科学
  • 生物材料工程 生物材料工程
  • 纳米技术 纳米技术

背景情况:

  • 骨的机械完整性依赖于其异质结构,适应当地应变环境.
  • 这种骨适应突显了应变和材料梯度之间的相关性,这是合成功能梯度材料中未被充分探索的原则.
  • 开发模仿这些骨状梯度的合成材料对于先进的应用至关重要.

研究的目的:

  • 合成具有复杂结构和组成梯度的异质骨状纳米复合材料.
  • 调查诱导应变分布在创造这些梯度中的作用.
  • 探索由此产生的机械性能和自我愈合能力.

主要方法:

  • 合成的聚合物纳米复合材料含有无形酸 (ACP).
  • 应用单轴拉伸来诱导受控的应变分布.
  • 分析了结构变化 (对齐,结晶性,ACP捕获) 和使用纳米封闭和模板诱导结晶的组成梯度.
  • 评估了机械性能,附着性和自我愈合行为.

主要成果:

  • 单轴拉伸产生了应变梯度,从中心向侧面下降.
  • 应变梯度控制了聚合物对齐,结晶性和ACP分布,在中心形成对齐的纳米纤维结构,在侧面形成多孔结构.
关键词:
类似骨的物质是类似骨的材料.功能梯度材料是一种功能梯度材料.不同类型的材料.多个梯度的多个梯度.菌株分布 菌株分布 菌株分布

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  • ACP结晶导致面向的无酸纳米棒,在中心具有更高的结晶/无形比率.
  • 梯度的机械性能,粘附性和自我愈合能力与应变分布相关.

    • 结论:

    • 通过使用菌株分布,建立了合成具有复杂梯度的仿生材料的总体策略.
    • 开发的纳米复合材料表现出类似骨的结构,构成和机械梯度.
    • 这些发现为创建由生物结构启发的先进功能梯度材料提供了一条途径.