Internal strain assessment using FBGs in a thermoplastic composite subjected to quasi-static indentation and low-velocity impact
KAUST DepartmentComposite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS)
Mechanical Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberBAS/1/1315-01-01
Online Publication Date2019-02-19
Print Publication Date2019-05
Permanent link to this recordhttp://hdl.handle.net/10754/631204
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AbstractWe 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.
CitationMulle M, Yudhanto A, Lubineau G, Yaldiz R, Schijve W, et al. (2019) Internal strain assessment using FBGs in a thermoplastic composite subjected to quasi-static indentation and low-velocity impact. Composite Structures 215: 305–316. Available: http://dx.doi.org/10.1016/j.compstruct.2019.02.085.
SponsorsThe 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.