A Review: Application of Nanoindentation Testing Technology in GFRP Materials
WANG Yaocheng1, LIU Dingkun1, LIU Wei1, LYU Yang2, ZHENG Yu3
1 Key Laboratory for Resilient Infrastructures of Coastal Cities, Ministry of Education, Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 508160, China 2 State Key Laboratory of Silicate Materials for Architectures (Wuhan University of Technology),Wuhan 430070,China 3 School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523830,China
Abstract: Glass fiber reinforced polymer (GFRP) has been widely used in various engineering fields, and its performance degradation under multiple types of service condition is relatively complex, which needs to be further explored from its macro and micro characteristic performances. Nanoindentation is a meaningful technique for getting micromechanical properties of GFRP components so as to establish their relationships with the overall mechanical performances of the GFRP in macroscale and provides a basis for further study on changes in GFRP during service. In actual detection process, due to the influences of constraint effect, pile-up effect and viscoelastic effect, testing errors between the as-measured and the real values cannot be completely avoided and may lead to misunderstanding of the obtained results. In this paper, principle of the nanoindentation technology is firstly introduced, based on which existing researches in testing regions of the GFRP, viz. glass fiber, resin matrix and their interphase, are reviewed. Also, reasons of measurement errors are discussed and their corresponding solutions or research directions are raised. Among the reasons of the caused errors, the pile-up and the viscoelastic effects of resin would lead to higher as-measured results, but merely influent the fiber results. The fiber constraint effect has a more obvious influence on results of all the regions in GFRP. Theoretical analyses prove that this constraint effect should exist in all types of composite materials, including GFRP. To minimize influence of the constraint effect, scholars have carried out both experimental and simulation studies, however, the current analyses are still superficial without any systematic outcome. Due to the influences of the constraint effect on as-measured results, initial theoretical analysis on properties of the interface between fiber and resin matrix is also carried out. Meanwhile, to facilitate an accurate analysis on micro-properties of GFRP, further relevant study directions regarding this application are also proposed.
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