Fatigue and post-fatigue static crack characterisation of a wrinkled thick glass fibre laminate in a composite wind turbine blade
Source abstract
Abstract
In this study, we present the fatigue and post-fatigue static crack characterisation of a wrinkled thick glass fibre/polyester composite laminate, which is cut out from a spar cap of a wind turbine blade after full-scale fatigue loading. Fatigue cracks in the laminate were characterised with X-ray computed tomography. The fracture mode and fracture path under fatigue loading were identified. A subsequent static compression test was conducted on the laminate to induce a further propagation of the existing fatigue cracks. The laminate was scanned again with X-ray computed tomography after static compression to identify the crack growth path. The fracture features induced by the fatigue and static compression were examined using scanning electron microscope analysis. It is found that the fractures of the wrinkled thick laminate under fatigue loading is characterised by Mode-II dominated fracture. Prominent and frequent matrix rollers and striations were observed on the fatigue fracture surfaces. The fractures of the laminate under static compression show mixed mode. The effects of existing fatigue cracks on the post-fatigue static cracks were investigated. The fracture features characterised in this work provide a reference for the root cause analysis of blade failure in the field.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Mechanical Behavior of Composites · Cellular and Composite Structures · Mechanical stress and fatigue analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (31)
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