TY - JOUR

T1 - Fatigue and residual strain monitoring for thermoplastic composite using embedded FBG inscribed in highly-birefringent side-hole elliptical core optical fiber

AU - Wachtarczyk, Karol

AU - Yadav, Neha

AU - Błachut, Aleksander

AU - Gąsior, Paweł

AU - Schledjewski, Ralf

AU - Kaleta, Jerzy

N1 - Publisher Copyright: © 2024 The Author(s)

PY - 2024/7/27

Y1 - 2024/7/27

N2 - Monitoring of thermoplastic carbon reinforced composites is critical for the safe operation and optimization of composite structures. Strain measurement during their manufacturing and operation is often achieved with embedded Fiber Bragg Gratings (FBG). However, conventional FBGs can only measure axial strain. To measure multiaxial strain in thermoplastic composites, FBGs inscribed in highly-birefringent side-hole elliptical core optical fiber (SH2 FBG) are proposed. SH2 FBG were used to monitor composite produced by automated tape laying process, first − to measure residual in-plane and out-of-plane strain during the manufacturing stage, second − in plane transverse strain during cyclic loading. It was demonstrated that the sensors can be used to measure multiaxial residual strain, observe changes in material stiffness, and calculate the area of the mechanical hysteresis loop. As a result − it was shown that embedding SH2 FBG can be an effective and robust method for monitoring the carbon fiber reinforced thermoplastic composite.

AB - Monitoring of thermoplastic carbon reinforced composites is critical for the safe operation and optimization of composite structures. Strain measurement during their manufacturing and operation is often achieved with embedded Fiber Bragg Gratings (FBG). However, conventional FBGs can only measure axial strain. To measure multiaxial strain in thermoplastic composites, FBGs inscribed in highly-birefringent side-hole elliptical core optical fiber (SH2 FBG) are proposed. SH2 FBG were used to monitor composite produced by automated tape laying process, first − to measure residual in-plane and out-of-plane strain during the manufacturing stage, second − in plane transverse strain during cyclic loading. It was demonstrated that the sensors can be used to measure multiaxial residual strain, observe changes in material stiffness, and calculate the area of the mechanical hysteresis loop. As a result − it was shown that embedding SH2 FBG can be an effective and robust method for monitoring the carbon fiber reinforced thermoplastic composite.

KW - Fatigue

KW - FBG sensor

KW - Polymer-matrix composites

KW - Process monitoring

KW - Strain measurement

UR - http://www.scopus.com/inward/record.url?scp=85200001157&partnerID=8YFLogxK

U2 - 10.1016/j.measurement.2024.115404

DO - 10.1016/j.measurement.2024.115404

M3 - Article

VL - 238.2024

JO - Measurement

JF - Measurement

SN - 0263-2241

IS - October

M1 - 115404

ER -