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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

148
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...
148
Beams with Symmetric Loadings01:15

Beams with Symmetric Loadings

187
The moment-area method is an analytical tool used in structural engineering to determine the slope and deflection of beams under various loads. Consider a cantilever with a concentrated load and moment at the free end. The first step is constructing a free-body diagram to calculate the reactions at the fixed end. Next, the bending moment diagram is plotted to visualize how the bending moment varies along the beam's length, focusing on points where the bending moment equals zero.
The M/EI...
187
Masonry Loadbearing Walls01:16

Masonry Loadbearing Walls

116
Masonry load-bearing walls, constructed from materials like brick, stone, or concrete masonry units, serve as a crucial component in building structures by supporting the loads from floors and roofs and transferring them to the foundation. These walls, known for their compressive strength, can be reinforced or unreinforced to suit different building needs, accommodating both the dead and live loads while maintaining safety through lower working stresses compared to the materials' ultimate...
116
Beams with Unsymmetric Loadings01:17

Beams with Unsymmetric Loadings

119
Analyzing a supported beam under unsymmetrical loadings is essential in structural engineering to understand how beams respond to varied force distributions. This analysis involves calculating the deflection and identifying points where the slope of the beam is zero, which are crucial for ensuring structural stability and functionality.
The first moment-area theorem determines the slope at any point on the beam. This theorem indicates that the change in slope between two points on a beam...
119
Internal Loadings in Structural Members: Problem Solving01:28

Internal Loadings in Structural Members: Problem Solving

1.3K
When designing or analyzing a structural member, it is important to consider the internal loadings developed within the member. These internal loadings include normal force, shear force, and bending moment. Engineers can ensure that the structural member can support the applied external forces by calculating these internal loadings.
To illustrate this, let's consider a beam OC of 5 kN, inclined at an angle of 53.13° with the horizontal and supported at both ends. Determine the internal...
1.3K
Unsymmetric Loading of Thin-Walled Members: Problem Solving01:07

Unsymmetric Loading of Thin-Walled Members: Problem Solving

103
The shear center of a channel section with uniform thickness, height, and width, is determined by computing the shear force in the member and calculating the moments of inertia of the sections.
To compute the shear forces, find the shear flow at a specific distance from the endpoint using the vertical shear and the moment of inertia values. The total shear force on the flange is calculated by integrating the shear flow from one end of the flange to the other.
Next, calculate the moments of...
103

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Updated: Jun 29, 2025

Structural Design and Manufacturing of a Cruiser Class Solar Vehicle
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双尺度螺旋材料用于平衡高负载轴承和声音吸收.

Chenlei Yu1,2, Mingyu Duan3, Fei Ti2,4

  • 1State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|March 30, 2024
PubMed
概括
此摘要是机器生成的。

一种新的螺旋多孔材料提供了吸声和承载能力,克服了传统的工程挑战. 这种轻量级设计显示出高特异性强度和优异的声学性能,适用于先进的应用.

关键词:
双重多孔性 双重多孔性承载性能 承载性能 承载性能多功能综合设计多功能综合设计声音吸收吸收的声音

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科学领域:

  • 材料科学 材料科学 材料科学
  • 声学工程 声学工程
  • 机械工程 机械工程

背景情况:

  • 在航空和铁路运输中,多孔材料对于吸声和承载能力至关重要.
  • 在多孔材料中同时实现高声吸收和机械强度是一个重大的工程挑战,因为固有的权衡.
  • 现有的材料,如泡,往往会对另一种材料的性能产生影响.

研究的目的:

  • 开发一种新的多孔材料设计,将优良的吸声能力与高承载能力相结合.
  • 为了研究一种新的结构概念,灵感来自于quilling艺术,用于创建先进的多孔材料.
  • 评估拟议的螺旋材料设计的机械和声学性能.

主要方法:

  • 一种新的螺旋材料是通过将平面材料滚动成螺旋结构来设计的,灵感来自于工艺.
  • 进行了实验测试,以评估螺旋材料的结构强度和声音吸收系数.
  • 螺旋材料的性能与泡和气凝进行了比较.

主要成果:

  • 螺旋材料由于螺旋结构内的自锁机制,表现出高的结构强度.
  • 由层间螺旋裂和对齐的亚毫米孔引起的双孔性,导致了优异的声音吸收 (平均系数为0.93在0-6400Hz范围内).
  • 与泡相比,螺旋板表现出更高的比特强度 (高达5.1MPa),并且接近气凝的声学性能.

结论:

  • 拟议的螺旋多孔材料有效地克服了吸声和机械强度之间的权衡.
  • 设计的适应性允许混合材料组合,使多种应用程序的多功能性成为可能.
  • 这种轻量级,高性能的螺旋材料具有在航空和运输等领域的先进工程应用的巨大潜力.