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Related Concept Videos

Measurements of Strain01:27

Measurements of Strain

2.7K
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...
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Thermal Strain01:19

Thermal Strain

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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...
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Stress-Strain Diagram01:10

Stress-Strain Diagram

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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...
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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

651
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.
651
Hooke's Law01:26

Hooke's Law

1.7K
Hooke's law, a pivotal principle in material science, establishes that the strain a material undergoes is directly proportional to the applied stress, defined by a factor called the modulus of elasticity or Young's modulus.
1.7K
Shearing Strain01:20

Shearing Strain

1.6K
The shearing strain represents a cubic element's angular change when subjected to shearing stress. This type of stress can transform a cube into an oblique parallelepiped without influencing normal strains. The cubic element experiences a significant transformation when exposed solely to shearing stress. Its shape alters from a perfect cube into a rhomboid, clearly demonstrating the effect of shearing strain. The degree of this strain is considered positive if it reduces the angle between the...
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A 3D-printed Chamber for Organic Optoelectronic Device Degradation Testing
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Study on the Correlation between Humidity and Material Strains in Separable Micro Humidity Sensor Design.

Chih-Yuan Chang1

  • 1Department of Civil Engineering, Feng Chia University, No. 100, Wenhwa Rd., Seatwen, Taichung 40724, Taiwan. rchang@fcu.edu.tw.

Sensors (Basel, Switzerland)
|May 9, 2017
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Summary

A new microsensor measures humidity within building exterior walls, crucial for understanding tile deterioration and preventing injuries. This technology aids in assessing moisture

Keywords:
humidity sensormicrominiaturizationsmart external wallstrain gaugetile

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Area of Science:

  • Building materials science
  • Environmental monitoring
  • Sensor technology

Background:

  • Falling tiles from building exteriors pose significant injury risks, particularly in regions like Taiwan.
  • Humidity is a key factor in the deterioration of exterior wall tiles, but direct measurement within building structures is challenging.
  • Existing methods struggle to accurately assess moisture levels within the critical cement mortar layer of external walls.

Purpose of the Study:

  • To develop and validate a separable microsensor for measuring humidity within the cement mortar layer (1.5-2 cm) of building exterior walls.
  • To utilize 3D printing for creating a protective encapsulation box for the sensor.
  • To analyze the correlation between measured humidity and external wall tile deterioration.

Main Methods:

  • Development of a separable microsensor capable of simultaneous temperature and humidity measurement.
  • Utilization of 3D printing to fabricate a robust encapsulation box for sensor protection against concrete and mortar.
  • In-situ deployment of the microsensor within the cement mortar layer of external building walls.

Main Results:

  • The developed microsensor successfully measured temperature and humidity within the target cement mortar layer.
  • The 3D-printed encapsulation effectively protected the sensor from the harsh building environment.
  • Data collected enabled preliminary analysis of humidity's impact on tile deterioration.

Conclusions:

  • The separable microsensor is a viable tool for monitoring internal wall humidity, addressing a critical gap in building diagnostics.
  • This technology can contribute to understanding and mitigating tile failure mechanisms caused by moisture.
  • Further research can integrate this sensor for predictive maintenance and improved building safety.