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相关概念视频

Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

209
The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member...
209
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

526
The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
526
Strain and Elastic Modulus01:15

Strain and Elastic Modulus

4.1K
The quantity that describes the deformation of a body under stress is known as strain. Strain is given as a fractional change in either length, volume, or geometry under tensile, volume (also known as bulk), or shear stress, respectively, and is a dimensionless quantity. The strain experienced by a body under tensile or compressive stress is called tensile or compressive strain, respectively. In contrast, the strain experienced under bulk stress and shear stress is known as volume and shear...
4.1K
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

326
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.
326
Plastic Deformations01:14

Plastic Deformations

131
It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
131
Unsymmetric Bending01:18

Unsymmetric Bending

435
Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from those in symmetrical bending, and are essential for designing structures to withstand different loading conditions. In unsymmetrical bending, the neutral axis—where stress is zero—does not necessarily align with the geometric axes of the cross-section. The...
435

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Updated: Sep 11, 2025

Strain Sensing Based on Multiscale Composite Materials Reinforced with Graphene Nanoplatelets
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灵感来源于金星机的基于PVDF的敏感应变传感器,具有模量调节的设计,用于异型曲折识别.

Li Zeng1, Yuan Li1, Qichao Li1

  • 1State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China. ypguo@sjtu.edu.cn.

Nanoscale
|August 14, 2025
PubMed
概括
此摘要是机器生成的。

使用核心外纳米纤维的灵活压电应变传感器可以将输出电压提高840%. 这种生物灵感设计提高了无人驾驶飞机中的风速传感等应用的灵敏度和耐用性.

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Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 生物模拟学是一种生物模拟学.

背景情况:

  • 聚乙烯化物 (PVDF) 是柔性压电应变传感器的一个有希望的材料,但其低的内在压电性限制了小应变监测的性能.
  • 现有的PVDF传感器在灵敏度和信号退化方面存在问题,阻碍了实际应用.

研究的目的:

  • 通过克服纯PVDF的局限性,开发高度敏感和耐用的柔性压电应变传感器.
  • 为了利用金星机的生物灵感,创建具有增强压电特性的新型核心纳米纤维.

主要方法:

  • 核心外纳米纤维的制造,其核心采用刚性聚胺66 (PA66) 芯和PVDF传感层外,其中包括聚多巴胺修饰的BaTiO3纳米粒子 (PBTO).
  • 利用模块差异化和同轴架构来实现方向应力传输.
  • 标志着压电性能,包括电压输出增强,曲灵敏度 (尺度因子) 和周期稳定性.

主要成果:

  • 与纯PVDF相比,核心外纳米纤维膜在输出电压方面显示了840%的增强.
  • 通过221.4.4的测量因子 (GF) 实现了高曲灵敏度.
  • 在12000次循环测试中仅有0.67%的信号衰减,表现出极好的耐用性.

结论:

  • 生物启发的核心外纳米纤维显著提高了压电性能,为敏感和强大的应变传感提供了可行的解决方案.
  • 能够识别风速的工程曲向量传感器,展示了优化无人机飞行轨迹的潜力.