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相关概念视频

Eccentric Loading01:16

Eccentric Loading

393
Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under...
393
Load along a Single Axis01:29

Load along a Single Axis

309
In structural engineering, the analysis of beams subjected to varying loads is a critical aspect of understanding the behavior and performance of these structural elements. A common scenario involves a beam subjected to a combination of different load distributions.
Consider a beam of length L subjected to a varying load, which is a combination of parabolic and trapezoidal load distribution along the x-axis. In this case, it is essential to determine the resultant loads, their locations, and...
309
Unsymmetric Loading of Thin-Walled Members01:23

Unsymmetric Loading of Thin-Walled Members

116
Thin-walled members with non-symmetrical cross-sections are vital to engineering structures, offering material efficiency and structural integrity. However, unsymmetrical loading on these members leads to complex stress distributions, resulting in simultaneous bending and twisting can cause deformation or structural failure. The interaction between bending and twisting requires detailed analysis to ensure structural resilience.
The concept of the shear center is crucial in countering the...
116
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

202
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.
202
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

195
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
195
Residual Stresses in Bending01:18

Residual Stresses in Bending

181
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
181

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Application of Design Aspects in Uniaxial Loading Machine Development
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在形外中提升,装载和结.

Daniel Duffy1, Joselle M McCracken2, Tayler S Hebner2

  • 1Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, United Kingdom.

Physical review letters
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PubMed
概括
此摘要是机器生成的。

液晶弹性体圆具有独特的承载能力. 新的研究揭示了形外的曲行为和不稳定性,影响了它们的起重性能.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程
  • 软物质物理学 软物质物理学

背景情况:

  • 液晶弹性体 (LCE) 是具有独特形状变形能力的刺激响应材料.
  • 形外是基本的结构元素,应用范围从航空航天到机器人.
  • 这些结构的承载能力对于它们的功能性能至关重要,特别是在主动提升应用中.

研究的目的:

  • 重新检查由液晶弹性体制成的形外的承载能力.
  • 研究这些形结构在压缩下曲的行为和后曲的不稳定性.
  • 建立一个新的理论框架,用于预测薄极限系统中的临界曲折负荷.

主要方法:

  • 贝机械学的理论分析.
  • 数字模拟用于模拟曲和后曲现象.
  • 理论预测和数值结果的实验验证.

主要成果:

  • 形外在比经典Seide-Koiter理论预测的负载更低的情况下曲,特别是在没有摩擦的条件下.
  • 曲开始于一个外界边界层,具有放大的亚齐木斯压缩和振荡曲.
  • 观察并描述了亚临界曲增长和复杂的后曲状态,具有多个曲的脊柱.
  • 为关键负载 (t^{5/2}) 推导出了一个新的薄极限公式,并进行了数值验证.

结论:

  • 这项研究揭示了形的新曲机制,与经典预测有所不同.
  • 深度后结行为导致复杂的模式和不稳定性,影响整体结构完整性.
  • 了解这些不稳定性对于优化活性形结构的起重性能至关重要.