RESEARCH PAPER
Residual strength assessment of wind turbine rotor blade composites under combined effects of natural aging and fatigue loads
1
School of Mechanical Engineering, Post-Doctoral Research Station of Electrical Engineering, Xinjiang University, Urumqi, 830046, P. R. China
2
School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, 730050, P. R. China
Publication date: 2020-12-31
Eksploatacja i Niezawodność – Maintenance and Reliability 2020;22(4):601-609
HIGHLIGHTS
- The relationship among residual strength, aging time and the CEF is quantified.
- Temperature has an important influence on the residual strength of GFRP.
- A model is proposed to account for combined effects of natural aging and fatigue loads.
- Natural aging has both positive and negative effects on the residual strength of GFRP.
KEYWORDS
ABSTRACT
In this paper, the combined effects of natural aging and fatigue loads are considered to assess the residual strength of wind turbine rotor blade composites under actual service environments. Firstly, a comprehensive environmental factor (CEF) methodology is adopted to
quantify the combined effects of environmental factors on residual strength. Meanwhile, the
artificial accelerated aging test data are used to determine the weight coefficients of the CEF.
Subsequently, a two-variable function is presented to characterize the relationship among
residual strength, aging time and the CEF. The natural aging test data are utilized to estimate the unknown parameters of the two-variable function. Finally, the combined effects of
natural aging and fatigue loads are considered, and a residual strength model is proposed to
analyze the strength degradation behaviors of the wind turbine rotor blade composites. The
results indicate that fatigue loads have negative effect on the residual strength, while natural
aging has both positive and negative effects on the residual strength.
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| eISSN: | 2956-3860 |
| ISSN: | 1507-2711 |
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