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相关概念视频

Measurements of Strain01:27

Measurements of Strain

2.1K
Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
2.1K
Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

533
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...
533
Thermal Strain01:19

Thermal Strain

2.3K
Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
2.3K
Temperature Dependent Deformation01:12

Temperature Dependent Deformation

193
In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
193
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

291
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
291
Stress-Strain Diagram01:10

Stress-Strain Diagram

839
A stress-strain diagram is a crucial tool that graphically displays a material's mechanical characteristics. This diagram is derived from a tensile test performed on a carefully prepared cylindrical specimen. The specimen has two gauge marks inscribed on its central part, and the distance between these marks is known as the gauge length. The cylindrical specimen is placed in a testing machine, which applies an increasing centric load. As this load grows, so does the gauge length. This...
839

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Production of a Strain-Measuring Device with an Improved 3D Printer
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一个单一的SAWR传感器系统来监测动态应变和温度.

Shane Winters, Mauricio Pereira da Cunha

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
    |July 28, 2025
    PubMed
    概括
    此摘要是机器生成的。

    这项研究引入了一个单一的表面声波共振器 (SAWR) 装置,用于同时测量动态应变和温度. 这项创新通过提供准确的实时反来增强工业环境中的结构健康监测.

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    科学领域:

    • 材料科学与工程 材料科学与工程
    • 传感器技术 传感器技术
    • 机械工程 机械工程

    背景情况:

    • 动态应变和温度监测对于工业安全和维护至关重要.
    • 现有的应变传感器面临着诸如粘附性,包装性,稳定性和温度交叉敏感性等挑战.
    • 表面声波共振器 (SAWR) 传感器在恶劣环境中提供紧,无线和无电池的操作.

    研究的目的:

    • 展示一个单一的SAWR设备,能够同时测量动态应变和温度.
    • 为了利用SAWR固有的温度传感器进行精确的应变校准.
    • 开发一种功率光谱技术,用于实时跟踪应变大小.

    主要方法:

    • 单个SAWR设备用于同时测量温度和动态应变.
    • 使用功率光谱技术来分析SAWR反应.
    • SAWR传感器对温度 (RT到190°C) 和动态应变 (1126 με在500Hz) 进行了校准.

    主要成果:

    • SAWR 的温度准确度在100°C以上的参考热电偶的2°C以内.
    • 与商用张力计相比,开发的方法实现了不到4%的总体张力差异.
    • 通过使用单个SAWR设备,成功地实现了动态应变和温度的同时测量.

    结论:

    • 一个SAWR设备可以有效地同时测量动态应变和温度.
    • SAWR固有的温度传感能力通过允许适当的校准来提高应变测量的准确性.
    • 这项技术为要求高的工业应用中结构健康监测提供了有前途的解决方案.