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相关概念视频

Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

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The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
250
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

246
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.
246
Generalized Hooke's Law01:22

Generalized Hooke's Law

799
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...
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Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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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...
138

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通过动态刚度方法对多层压电堆进行建模和表征.

Wenxiang Ding1, Zhaofeng Liang1, Wei Zhao1

  • 1School of Mechanical and Electrical Engineering, Shenzhen Polytechnic University, No. 7098, Liuxian Avenue, Shenzhen 518055, China.

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概括

一种新的动态刚度 (DS) 方法分析了多层压电堆中的振动. 这种高效的方法准确地模拟合振动,以优化设计.

关键词:
动态硬度方法的方法.电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电阻电电电电有限元素方法的有限元素方法.模式 形状 形状 模式多层压电堆多层压电堆.

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科学领域:

  • 机械工程 机械工程
  • 材料科学 材料科学 材料科学
  • 振动分析 振动分析

背景情况:

  • 多层压电堆对于精确的线性运动和高力产生至关重要.
  • 精确的动态振动分析对于优化压电堆性能至关重要.

研究的目的:

  • 提出一种新的动态刚度 (DS) 方法,用于分析多层压电堆的动态振动.
  • 为参数和优化研究提供高效准确的分析工具.

主要方法:

  • 从控制运动方程中推导出纯,对称合和反对称合振动的一般解决方案.
  • 计算单个层的动态刚度 (DS) 矩阵,并将其组装成一个全局的DS矩阵.
  • 对电阻率和模式形状的有限元法进行验证.

主要成果:

  • 拟议的DS方法准确地预测了多层压电堆的动态行为.
  • 在DS方法和有限元分析结果之间观察到良好的一致性.
  • 这项研究研究了层次数对动态反应的影响.

结论:

  • 开发的动态刚度方法是多层压电结构的有效分析工具.
  • 这种方法促进了对合振动的参数和优化分析.
  • 这些发现有助于改进压电装置的设计和应用.