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.
Bibliographical noteFunding Information:
The research reported in this publication was supported by the Saudi Arabia Basic Industries Corporation ( SABIC ) under Grant Agreement number RGC/3/2050-01-01 and by King Abdullah University of Science and Technology ( KAUST ), under award number BAS/1/1315-01-01 . The authors are very grateful to Dr. Husam Wafai and Ditho Pulungan for their technical support and valuable advice.
© 2019 Elsevier Ltd
- Fiber Bragg grating
- Low-velocity impact
- Quasi-static indentation
- Strain monitoring
- Thermoplastic composite
ASJC Scopus subject areas
- Ceramics and Composites
- Civil and Structural Engineering