Abstract
We present, for the first time, an experimental investigation of internal strain monitoring in thermoplastic composites subjected to quasi-static indentation and low-velocity impact using embedded fiber Bragg gratings (FBGs). The goal is to highlight the interest and limitations of the in-core instrumentation of glass fiber-reinforced polypropylene laminates subjected to these two classical loading conditions. We propose an instrumentation strategy utilizing FBGs that is expected to provide a reliable set of internal strain values and strain rates, which can be used for the analysis of the damage behavior and the validation of a numerical mesoscale model of laminates. Based on a specific sensor insertion procedure, monitoring techniques and optical observations, we show how the applied methodology alleviates major issues, such as determining the in-plane and through-thickness position of the embedded FBGs, their influence on the structural integrity or the interpretation of the reflected optical signal.
Recommended Citation
M. Mulle et al., "Internal Strain Assessment using FBGs in a Thermoplastic Composite Subjected to Quasi-Static Indentation and Low-Velocity Impact," Composite Structures, vol. 215, pp. 305 - 316, Elsevier, May 2019.
The definitive version is available at https://doi.org/10.1016/j.compstruct.2019.02.085
Department(s)
Mechanical and Aerospace Engineering
Publication Status
Full Text Access
Keywords and Phrases
Fiber Bragg grating; Low-velocity impact; Quasi-static indentation; Strain monitoring; Thermoplastic composite
International Standard Serial Number (ISSN)
0263-8223
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Elsevier, All rights reserved.
Publication Date
01 May 2019
Comments
King Abdullah University of Science and Technology, Grant BAS/1/1315-01-01