Spatial reliability analysis of a wind turbine blade cross section subjected to multi-axial extreme loading. (May 2017)

• Record Type: Journal Article
• Authors: Dimitrov, N.; Bitsche, R.D.; Blasques, J.P.
• Is Part Of: Structural safety. Volume 66(2017)
• Page Start: 27
• Page End: 37
• Publication Date: 2017-05
• Subjects: Probabilistic -- Wind turbine -- Composite -- Blade -- Cross section -- Reliability -- System -- Spatial; Structural stability -- Periodicals; Safety factor in engineering -- Periodicals; Reliability (Engineering) -- Periodicals; Constructions -- Stabilité -- Périodiques; Coefficient de sécurité en ingénierie -- Périodiques; Fiabilité -- Périodiques; 620.86
• DOI: 10.1016/j.strusafe.2017.01.007
• Languages: English
• ISSNs: 0167-4730

Abstract

Highlights: We assess the reliability against material failure of a wind turbine blade cross section. Random loads, material strength, spatial correlation, and system effects are considered. Single-ply failure and progressive failure approaches are considered. The system reliability problem is solved by Importance Sampling. Spatial correlation length of 100 mm or more resulted in increased system reliability. Abstract: This paper presents a methodology for structural reliability analysis of wind turbine blades. The study introduces several novel elements by taking into account loading direction using a multiaxial probabilistic load model, considering random material strength, spatial correlation between material properties, progressive material failure, and system reliability effects. An example analysis of reliability against material failure is demonstrated for a blade cross section. Based on the study we discuss the implications of using a system reliability approach, the effect of spatial correlation length, type of material degradation algorithm, and reliability methods on the system failure probability, as well as the main factors that have an influence on the reliability.