Abstract
In this paper, the damage mechanism of glass fiber reinforced composite (GFRC) under lightning strike by laying and inserting copper wires in the laminate was studied. The ablation characteristics of GFRC under different lightning current components were explored. Scanning electron microscope (SEM) was used to conduct the morphology analysis at the damaged area. The results show that the high temperature induced by lightning striking leads to resin pyrolysis, glass fiber (GF) sublimation, and stress waves, which results in fiber breakage and delamination. Then, a finite element (FE) thermal-electric coupling model for predicting the lightning ablation damage of GFRC was established. The comparison between the simulation and experimental results are in good agreement, which validate the effectiveness of the proposed FE model. The relationship between the lightning ablation area and the lightning current amplitude, charge amount, and specific energy in creeping discharge and through discharge was obtained by data fitting. The whole ablation damage process was revealed by FE simulation.
Highlights
Fiber-reinforced composite (FRC) materials have been widely employed in aeronautics, astronautics, power industry, and other fields due to their light weight, high specific strength, high specific modulus, good corrosion resistance, and fatigue resistance [1,2,3,4]
The subroutine USDFLD was used to update the physical properties of the material based on the pyrolysis degree obposed finite element (FE) simulation model to simulate the transient changes in the physical properties of glass fiber reinforced composite (GFRC) laminates
This paper investigated thethe ablative damage characteristics ofof the used inin wind turbine blades with three lightning current components
Summary
Fiber-reinforced composite (FRC) materials have been widely employed in aeronautics, astronautics, power industry, and other fields due to their light weight, high specific strength, high specific modulus, good corrosion resistance, and fatigue resistance [1,2,3,4]. Glass fiber composite materials are widely used in the manufacture of wind turbine blades, most research works still focus on the damage characteristics analysis of carbon fiber composite materials under lightning striking, and mainly detected the macroscopic damage [15,16,17,18]. The previous study did not consider the lightning ablation damage of wind turbine blade under creeping discharge, which is a very common discharge form induced by lightning striking. The function relationship between ablation damage area and lightning current amplitude, charge amount and specific energy is established, which provides a theoretical basis for the study on the lightning damage of GFRC used in wind turbine blades
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