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<p>This paper deals with in-situ measurement in a composite part with metric dimensions during its life cycle, from curing to blast loading. To achieve this objective, a single fiber with three Bragg gratings is used. Two different curing processes are involved, respectively in autoclave and in a curing oven, and strain measurements are performed during both polymerization cycles, especially during the cooling phase where residual strain is building up. Because blast loading is highly dynamic (loading duration typically tens to hundreds of µs), an adapted measurement system is required. The system used for the blast loading application is based on pulsed illumination of the Bragg gratings and wavelength to time conversion is used to measure the strain of the composite at a frequency of 100&#xa0;MHz. The residual and dynamic strain measurements during blast loading are compared to finite element models.</p>

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Strain Measurements Through Fiber Bragg Grating Sensors Embedded in Composite Structure: From Curing to Blast Loading

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • T. Paccou,
  • F. Collombet,
  • Y. Barbarin,
  • L. Crouzeix,
  • Y. Davila,
  • YH. Grunevald,
  • A. Rouquand

摘要

This paper deals with in-situ measurement in a composite part with metric dimensions during its life cycle, from curing to blast loading. To achieve this objective, a single fiber with three Bragg gratings is used. Two different curing processes are involved, respectively in autoclave and in a curing oven, and strain measurements are performed during both polymerization cycles, especially during the cooling phase where residual strain is building up. Because blast loading is highly dynamic (loading duration typically tens to hundreds of µs), an adapted measurement system is required. The system used for the blast loading application is based on pulsed illumination of the Bragg gratings and wavelength to time conversion is used to measure the strain of the composite at a frequency of 100 MHz. The residual and dynamic strain measurements during blast loading are compared to finite element models.