Internal strain assessment using FBGs in a thermoplastic composite subjected to quasi-static indentation and low-velocity impact

M. Mulle, A. Yudhanto, G. Lubineau*, R. Yaldiz, W. Schijve, N. Verghese

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)305-316
Number of pages12
JournalComposite Structures
StatePublished - May 1 2019

Bibliographical note

Funding 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.

Publisher Copyright:
© 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


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