ArticleSensors (Basel, Switzerland)2018
A Fiber Bragg Grating (FBG)-Enabled Smart Washer for Bolt Pre-Load Measurement: Design, Analysis, Calibration, and Experimental Validation.
Article in Sensors (Basel, Switzerland), 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- A Review of Mechanical Degradation, Interfacial Nonlinear Dynamics and Multi-Bolt Coupling Degradation Mechanisms of Flange-Bolted Joints.Sensors (Basel, Switzerland) · 2026Review
- Sensor-Based Monitoring of Bolted Joint Reliability in Agricultural Machinery: Performance and Environmental Challenges.Sensors (Basel, Switzerland) · 2025Review
- A tailless FBG smart bolt with good performance.Heliyon · 2024Article
- Dual-Wave ZnO Film Ultrasonic Transducers for Temperature and Stress Measurements.Sensors (Basel, Switzerland) · 2024Article
- Axial Load Measurement of Bolts with Different Clamping Lengths Based on High-Frequency Ultrasonic ZnO Film Sensor.Sensors (Basel, Switzerland) · 2023Article
- TR Self-Adaptive Cancellation Based Pipeline Leakage Localization Method Using Piezoceramic Transducers.Sensors (Basel, Switzerland) · 2022Article
- Fiber Link Health Detection and Self-Healing Algorithm for Two-Ring-Based RoF Transport Systems.Sensors (Basel, Switzerland) · 2019Article
- Testing Mechanical Properties of Rock Bolt under Different Supports Using Fiber Bragg Grating Technology.Sensors (Basel, Switzerland) · 2019Article
- A Novel Embeddable Tubular Piezoceramics-Based Smart Aggregate for Damage Detection in Two-Dimensional Concrete Structures.Sensors (Basel, Switzerland) · 2019Article
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Authors and funding
4 authors.
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Abstract
A washer is a common structural element that is directly used along the loading path of a bolted connection. Pre-load on a bolted connection directly impacts its load bearing capacity and pre-load monitoring is an important aspect of structural health monitoring (SHM). With the change of the pre-load on a bolted connection, the loading force on the washer will change and, therefore, the outer diameter and outer circumferential length of the washer will change. Taking advantage of the high sensitivity and the small size of a Fiber Bragg Grating (FBG) sensor, we propose an innovative smart washer encircled by an FBG sensor that can directly measure the circumferential strain change and, therefore, the pre-load on the washer. For protection, the FBG is embedded in a pre-machined groove along the circumferential surface of the washer. A theoretical approach is used to derive the linear relationship between the applied load and the circumferential strain of the washer. To validate the functionality of the FBG-enabled smart sensor for in situ bolt pre-load monitoring, a simple but effective testing apparatus is designed and fabricated. The apparatus involves a bolt, the FBG-enabled washer, a metal plate, and a nut. The bolt has an embedded FBG along its axial direction for precise axial strain and, therefore, force measurement. With the calibrated axial force measuring bolt, in situ experiments on the FBG-enabled smart washers are conducted. Experimental results reveal the linear relationship between the pre-load and the wavelength of the FBG sensor encircling the washer. Both analytical and experimental results demonstrate that the proposed novel approach is sensitive to the bolt pre-load and can monitor in real time the bolt looseness in the entire loading range.
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