Linear Guide with Material Integrated Strain Gauges for Structural Health Monitoring

Purpose Structural health monitoring (SHM) has become an attractive subject in aerospace engineering field considering the opportunity to avoid catastrophic failures by detecting damage in advance and to reduce maintenance costs. Fibre Bragg Grating (FBG) sensors are denoted as one of the most promising sensors for SHM applications as they are lightweight, immune to electromagnetic effects and able to be embedded between the layers of composite structures. The purpose of this paper is to research on and demonstrate the feasibility of FBG sensors for SHM of composite structures. Design/methodology/approach Applications on thin composite beams intended for SHM studies are presented. The sensor system, which includes FBG sensors and related interrogator system, and manufacturing of the beams with embedded sensors, are detailed. Static tension and torsion tests are conducted to verify the effectiveness of the system. Strain analysis results obtained from the tests are compared with the ones obtained from the finite element analyses conducted using ABAQUS® software. In addition, the comparison between the data obtained from the FBG sensors and from the strain gauges is made by also considering the noise content. Finally, fatigue test under torsion load is conducted to observe the durability of FBG sensors. Findings The results demonstrated that FBG sensors are feasible for SHM of composite structures as the strain data are accurate and less noisy compared to that obtained from the strain gauges. Furthermore, the convenience of obtaining reliable data between the layers of a composite structure using embedded FBG sensors is observed. Practical implications Observing the advantages of the FBG sensors for strain measurement will promote using FBG sensors for damage detection related to the SHM applications. Originality/value This paper presents applications of FBG sensors on thin composite beams, which reveal the suitability of FBG sensors for SHM of lightweight composite structures.

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Techniques for Processing Experimental Data for Structural Health Monitoring of Bridges

World of Transport and Transportation ◽

10.30932/1992-3252-2021-19-4-3 ◽

2022 ◽

Vol 19 (4) ◽

pp. 22-33

Author(s):

N. M. Kvashnin ◽

I. S. Bondar ◽

M. Ya. Kvashnin

Keyword(s):

Structural Health Monitoring ◽

Bearing Capacity ◽

Health Monitoring ◽

Strain State ◽

Technical Condition ◽

Strain Gauges ◽

Vertical Load ◽

Stress Strain ◽

Artificial Structures ◽

Structural Health

Reliability of transport artificial structures and transit of trains at sanctioned speed should be provided with the necessary and sufficient load-bearing capacity, strength, rigidity, and stability of engineering structures.The objective of this work was to substantiate the possibility of using well-known methods for controlling the stress-strain state of structures using automated systems of structural health monitoring of bridge spans.It is extremely important regarding operation of transport artificial structures designed according to the standards of the first half of the 20th century.Under these conditions, the experimental determination of the stress-strain state of bearing structures of bridges becomes the most important component of the task of a comprehensive assessment of physical wear and tear as well as of operational reliability of the structures. Monitoring the structural health and technical condition of bridges and planning of timely measures aimed at the repair, strengthening or reconstruction of spans will extend their service life and ensure safety during operation.Maximum permissible deflections of spans under a movable temporary vertical load have been revealed since to ensure smooth movement of vehicles it is necessary to control horizontal longitudinal and transverse displacements of the top of the bridge piers, as well as vertical settlements.The paper suggests methods of interpreting data measured by inclinometers and electric strain gauges, tensiometers to use them in an automated system for monitoring the structural health of railway bridges. The method of strain measurement is described in detail in the proposed options for installing resistance strain gauges on structures to measure tensile-compression stresses and longitudinal forces due to a temporary vertical load.Monitoring the technical condition of bridge structures, using the methods for measuring deflections and deformations proposed by the authors in this article, will make it possible to assess the change in bearing capacity of the structure over the entire period of operation. The study used regulations and experience of the Russian Federation and the Republic of Kazakhstan.

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A Study on Development of Structural Health Monitoring System for Steel Beams Using Strain Gauges

Journal of the Korea institute for structural maintenance inspection ◽

10.11112/jksmi.2012.16.1.099 ◽

2012 ◽

Vol 16 (1) ◽

pp. 99-109 ◽

Cited By ~ 3

Author(s):

Hyun Gyu Hahn ◽

Hyung Joon Ahn

Keyword(s):

Structural Health Monitoring ◽

Monitoring System ◽

Health Monitoring ◽

Strain Gauges ◽

Steel Beams ◽

Health Monitoring System ◽

Structural Health ◽

Structural Health Monitoring System

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Strain gauges debonding fault detection for structural health monitoring

Structural Control and Health Monitoring ◽

10.1002/stc.2264 ◽

2018 ◽

Vol 25 (12) ◽

pp. e2264 ◽

Cited By ~ 4

Author(s):

João dos Reis ◽

Carlos Oliveira Costa ◽

José Sá da Costa

Keyword(s):

Structural Health Monitoring ◽

Fault Detection ◽

Health Monitoring ◽

Strain Gauges ◽

Structural Health

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Highly Elastic Strain Gauges Based on Shape Memory Alloys for Monitoring of Fibre Reinforced Plastics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.742.778 ◽

2017 ◽

Vol 742 ◽

pp. 778-785

Author(s):

Thomas Mäder ◽

Inaki Navarro y de Sosa ◽

Björn Senf ◽

Peter Wolf ◽

Martin Hamm ◽

...

Keyword(s):

Structural Health Monitoring ◽

Shape Memory Alloys ◽

Shape Memory ◽

Health Monitoring ◽

Strain Sensors ◽

Strain Gauges ◽

Gauge Factor ◽

Resistance Change ◽

Structural Health ◽

Reinforced Plastics

Conventional strain gauges made of constantan or CuCr for instance have a low value for structural health monitoring issues in plastic composites. These strain sensor materials exhibit small elastic regions and show fatigue when dynamically loaded with strain levels over 0.3 percent. For this reason, these sensors would break or fail before the composite life-time and thus cannot be integrated into this kind of composite materials. Pseudoelastic thermal shape memory alloys are therefore used as strain sensors and integrated into composites in order to allow piezoresistive strain measurement and structural health monitoring in such materials. Thermal treatments are used to create sensor structures out of shape memory alloy wires. Pseudoelastic shape memory wires can be strained up to 8 percent repeatedly. Their gauge factor is higher than 5. Shape memory strain sensors are successfully embedded into glass fibre reinforced plastics and show a significant and reproducible resistance change when the composite is strained. The dynamic strength is magnificently higher compared to conventional strain gauges. Shape memory strain sensors are an efficient alternative to fiber-bragg-grating sensors and can potentially be used for strain measurements in different plastics and textile materials. Shape memory sensor structures can be embedded or applied and are good candidates for structural characterisation and monitoring applications.

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Using Fiber Optic Sensors for Bridge Monitoring

Advances in Technology ◽

10.31357/ait.v1i2.4938 ◽

2021 ◽

Vol 1 (2) ◽

Author(s):

Amal Jayawardena ◽

◽

Gayan Appuhamillage ◽

Keyword(s):

Structural Health Monitoring ◽

Health Monitoring ◽

Fiber Optic Sensors ◽

Strain Gauges ◽

Bridge Monitoring ◽

Practical Applications ◽

Structural Health ◽

Before And After ◽

Fbg Sensors ◽

The Operating Mechanism

This paper presents the data obtained from monitoring a steel Struss bridge using Fiber Bragg Grating (FBG) sensors before and after a proposed repair for a crack propagation in the end plates. This paper details the operating mechanism behind the FBG sensors and advantages of using FBG sensors over resistive foil strain gauges for bridge structural health monitoring and also details how cracks on the outer web’s end plate originated and then provides a step-by-step guide to the completed repair. This technology can be use in other practical applications where structural health monitoring is needed.

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Strain Monitoring

10.1007/978-3-030-72192-3_8 ◽

2021 ◽

pp. 219-241

Author(s):

Steve Vanlanduit ◽

Mario Sorgente ◽

Aydin R. Zadeh ◽

Alfredo Güemes ◽

Nadimul Faisal

Keyword(s):

Structural Health Monitoring ◽

Health Monitoring ◽

Measurement Data ◽

Strain Sensors ◽

Strain Gauges ◽

Low Frequencies ◽

Fiber Sensors ◽

Structural Health ◽

Strain Monitoring ◽

Working Principle

AbstractThis chapter provides an overview of the use of strain sensors for structural health monitoring. Compared to acceleration-based sensors, strain sensors can measure the deformation of a structure at very low frequencies (up to DC) and enable the measurement of ultrasonic responses. Many existing SHM methods make use of strain measurement data. Furthermore, strain sensors can be easily integrated in (aircraft) structures. This chapter discusses the working principle of traditional strain gauges (Sect. 8.1) and different types of optical fiber sensors (Sect. 8.2). The installation requirements of strain sensors and the required hardware for reading out sensors are provided. We will also give an overview of the advantages and the limitations of commonly used strain sensors. Finally, we will present an overview of the applications of strain sensors for structural health monitoring in the aeronautics field.

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