Structural concrete measurements: New distributed approach for standard specimens

Measurement, Journal Year: 2024, Volume and Issue: 235, P. 115003 - 115003

Published: May 26, 2024

Concrete structures are widely used in construction because of their many advantages, including high corrosion resistance, durability, low operating costs, and the ability to design any geometry. However, they also have some disadvantages, such as dead weight susceptibility cracking. Although this material is globally, new types concrete, high-strength or lightweight aggregate-based, still being developed. This requires constant control testing both laboratory field conditions. a heterogeneous due influence aggregate grains local discontinuities, voids pores. Given these characteristics, it clear that most conventional diagnostic solutions, spot foil strain gauges extensometers, unable accurately analyse localised effects average strains over measurement base. In contrast, distributed fibre optic sensing (DFOS) enables readings be taken with millimetre geometric resolution, significantly extending structural assessment capability. The article describes research on standard concrete cylinders equipped surface-mounted optical fibres for simultaneous measurements longitudinal direction (compression zone) circumference (tension zone). novelty proposed approach, apart from way arranging specimens, lies mainly approach allow 1) evaluation homogeneity using statistical parameters, 2) identification microcracking 3) near-to-failure state based Poisson's ratio analysis. Twenty cylindrical specimens were tested reference techniques validate performance DFOS-based system provide data evaluation. results indicate possibility detecting approaching damage even without knowledge properties specimen initial stress level at moment starting measurements. discussion covered future directions potential improvements.

Language: Английский

Spacecraft Segment Damage Identification Method Based on Fiber Optic Strain Difference Field Reconstruction and Norm Calculation

Sensors, Journal Year: 2023, Volume and Issue: 23(21), P. 8822 - 8822

Published: Oct. 30, 2023

Real-time online identification of spacecraft segment damage is great significance for realizing structural health monitoring and life prediction. In this paper, a response characteristic field inversion algorithm based on the differential reconstruction strain proposed to solve problem not being able recognize small damages structure directly by alone. Four crack location methods vector norm computation are proposed, which realize precise events without external excitation means working loads only. A system fiber optic grating sensors was constructed, average error localization curvature 2 calculation 2.58 mm, root-mean-square 1.98 mm. The results show that method has superior engineering applicability on-orbit service environments.

Language: Английский

Uniaxial Carbon Nanotube Fiber Reinforced Dielectric Elastomer Actuator with Self-Sensing

Composites Communications, Journal Year: 2024, Volume and Issue: 50, P. 102025 - 102025

Published: July 31, 2024

Language: Английский