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Design Example: Strain Gauge Bridge or Wheatstone Bridge01:15

Design Example: Strain Gauge Bridge or Wheatstone Bridge

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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...
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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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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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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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Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
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Temperature Dependent Deformation01:12

Temperature Dependent Deformation

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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...
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Solution Evolution Knowledge Service Based on Design Iteration in Strain Sensor Design.

Kai Zhang1,2, Wu Zhao1,2, Qingjie Liu3

  • 1School of Mechanical Engineering, Sichuan University, Chengdu 610065, China.

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|February 28, 2023
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Summary

This study introduces a new knowledge service method for product design evolution, using problem-strategy-solution (PSS) interactions. This approach enhances how designers access and use knowledge during iterative design processes.

Keywords:
design iterationknowledge servicenanofibersolution evolutionstrain sensor

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Area of Science:

  • Engineering and Technology
  • Computer Science
  • Materials Science

Background:

  • Product design relies on iterative improvement, but knowledge application is a bottleneck for complex designs.
  • Existing methods struggle to support evolving design solutions across multiple iterations.
  • Efficient knowledge acquisition and application are crucial for advancing product design levels.

Purpose of the Study:

  • To propose a novel knowledge service method for product design solution evolution.
  • To address the limitations of current knowledge application in complex, iterative design scenarios.
  • To facilitate designers' access to and utilization of knowledge throughout the design evolution process.

Main Methods:

  • Developed a knowledge service method based on problem-strategy-solution (PSS) interaction iteration.
  • Analyzed the mapping and feedback between design problems, strategies, and solutions.
  • Established a PSS-based mechanism and knowledge service model for solution evolution, implemented on a computer-aided design platform.

Main Results:

  • A model for solution evolution based on design iteration was proposed and established.
  • A knowledge service dimension and model for product design solution evolution were built.
  • The effectiveness of the iterated-based design method was validated through innovations in nanofiber preparation and strain sensors.

Conclusions:

  • The proposed PSS-based knowledge service method effectively supports product design solution evolution.
  • The approach improves knowledge application in iterative design, overcoming existing bottlenecks.
  • The validated method demonstrates potential for advancing technical innovation in product design.