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Title: The effect of manufacturing defects on the fatigue performance of wind turbine blades
Author: Galappaththi, Udayanga Indunil Kumara
ISNI:       0000 0004 5359 2142
Awarding Body: Glasgow Caledonian University
Current Institution: Glasgow Caledonian University
Date of Award: 2014
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Manufacturing defects are one of the main reasons for premature failure of wind turbine blades. This thesis investigates the effects of manufacturing defects on the fatigue performance of composite wind turbine blades. A strategic defect risk management protocol for wind turbine blade manufacture is proposed, in which the classification of defect characteristics, evaluation of the effects of defects, their criticality and implementation of manufacturing quality control strategies form the key phases. Based on published data, ply waviness, voids, delamination, adhesive failure and thickness difference are identified as the key manufacturing defects in composite wind turbine blades. These defects are attributed to poor quality raw materials and inadequate production process parameter control. Wet-layup, Prepreg, SPRINT-Prepreg and Vacuum Assisted Resin Transfer Moulding (VARTM) processes were considered for the analysis. Three small scale wind turbine blades were manufactured and a case study was conducted to determine the influence of VARTM process parameter variations to initiate manufacturing defects. It was identified that the resin flow of the VARTM process should be closely controlled to avoid defects.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available