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State-of-strain evaluation with fiber Bragg grating rosettes: application to discrimination between strain and

S Magne1, S Rougeault, M Vilela

  • 1Départment d'Electronique et d'Instrumentation Nucléaire, Service de Physique Electronique, Laboratoire d'Electronique de Technologie et d'Instrumentation, Commissariat à l'Energie Atomique (Technologies Avancées), Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette Cedex, France.

Applied Optics
|February 12, 2008
PubMed

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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 gauge...
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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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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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