Assessment of the Effect of Hybrid GFRP CFRP Usage in Wind Turbine Blades on the Reduction of Fatigue Damage Equivalent Loads in the Wind Turbine System

2015-01-05
Gözcü, Ozan
Farsadi, Touraj
Şener, Özgün
Kayran, Altan
The use of hybrid GFRP-CFRP material in wind turbine blades is investigated for its effectiveness in reducing fatigue damage equivalent loads in the whole wind turbine system, and comparisons are made against the baseline full GFRP blade in terms of strength, deformation, dynamic characteristics, weight and cost of the blade. To achieve load alleviation in the whole wind turbine system, bending-twisting coupling in composite blades is exploited through the use of off-axis plies in the spar caps of the blades. Fatigue damage equivalent load is used as the metric to assess the effect of off-axis ply placement in the main spar caps of the turbine blade on the load alleviation in the whole wind turbine system. Study is conducted utilizing both linear and non-linear blade models in the multi-body models of the wind turbine system. For the purposes of the study, 5 MW multi-body wind turbine models are set up in two separate wind turbine multi-body dynamic codes SWT and PHATAS that use superelement and non-linear beam blade definitions, respectively. Multi-body dynamic simulations of the wind turbine system are performed for the power production load case using the normal turbulence model as the external wind loading. Time history results of simulations are used to calculate fatigue damage equivalent loads at the selected monitor points in the wind turbine system. Results show that in the overall, with the introduction of off-axis CFRP spar cap plies in the blades, higher reductions in the damage equivalent loads can be achieved in the wind turbines system compared to the use of full GFRP in the main spar caps of the blade. Preliminary study on the effect of off-axis spar cap plies on the strength, deformation, dynamic characteristics, weight and cost of the bend-twist coupled blades also show that bend-twist coupled blades do not have any disadvantages when compared to the baseline blade. © 2015, American Institute of Aeronautics and Astronautics Inc. All rights reserved.
Assessment of the Effect of Hybrid GFRP CFRP Usage in Wind Turbine Blades on the Reduction of Fatigue Damage Equivalent Loads in the Wind Turbine System", AIAA Science and Technology Forum and Exposition, AIAA SciTech 2015, 33rd Wind Energy Symposium, Kissimmee, Amerika Birleşik Devletleri, 5 - 09 Ocak 2015

Suggestions

Ballistic impact performance of an armor material consisting of alumina and dual phase steel layers
Ubeyli, Mustafa; Deniz, Huseyin; DEMİR, TEYFİK; Ögel, Bilgehan; Gurel, Bayram; KELEŞ, Ömer (2011-03-01)
Utilization of a ceramic front layer provides an improvement in the ballistic efficiency of monolithic metallic materials. In the current paper, the ballistic behavior of laminated composite having alumina front and dual phase steel backing layers was studied using 7.62 mm armor piercing (AP) projectiles under normal impact. The variables used were martensite content of the backing layer and the areal density of the composite. Experimental results showed that utilization of a 6 mm thick alumina front layer ...
Comparison of transient and quasi-steady aeroelastic analysis of wind turbine blade in steady wind conditions
Sargın, H; Kayran, Altan (2014-6-16)
In the preliminary design stage of wind turbine blade, faster and simpler methods are preferred to predict the aeroelastic response of the blades in order to get an idea about the appropriateness of the blade stiffness. Therefore, in the present study, applicability of the quasi-steady aeroelastic analysis of wind turbine blade is investigated in terms of how accurately the quasi-steady aeroelastic analysis predicts the deformed state of the blade at certain azimuthal positions. For this purpose, compa...
Damage Progression in Thick Curved Composite Laminates under Static and Fatigue Loading
Tasdemir, B.; Çöker, Demirkan (IOP Publishing; 2018-06-22)
In this study, damage behavior of curved carbon fiber reinforced polymer (CFRP) composite laminates that are important sub-structures (ribs, shear webs and spar flanges etc.) for wind turbine blades are investigated under static and fatigue loading conditions. Cross-ply curved specimen consisting of groups of three 0 degrees and 90 degrees layers is used for clear observation of the matrix cracking in thicker plies. Damage mechanisms and locations under static and fatigue loadings are examined. In the exper...
Investigation of the effect of bending twisting coupling on the loads in wind turbines with superelement blade definition
Gözcü, Mehmet Ozan; Kayran, Altan; Department of Aerospace Engineering (2014)
In this thesis study, the effect of off-axis plies in the spar caps of a wind turbine blade on the damage equivalent loads in a wind turbine system is investigated. The off-axis plies in the spar caps are exploited for load alleviation in the whole turbine system since the off-axis plies induced bending-twisting coupling into blades of wind turbine. Damage equivalent load is used to assess the effect of bend twist coupled blade on the fatigue load reduction in the whole wind turbine system. NREL's 5 MW turb...
Reduction of Fatigue Damage Equivalent Loads in the Wind Turbine System Through the Use of Off Axis Plies in the Spar Caps of Composite Wind Turbine Blades
Gözcü, Ozan; Farsadi, Touraj; Şener, Özgün; Kayran, Altan (2015-07-19)
In the wind turbine industry, as the requirements for fatigue life and reliability increase, to achieve these goals appropriate measures must be taken such that loads incurred due to the flexing of the blades must be alleviated. In this study, the use of different off-axis ply angles in the main spar caps of wind turbine blades is investigated for its effectiveness in reducing fatigue damage equivalent loads in the whole wind turbine system. To achieve load alleviation in the wind turbine system, bendingtwi...
Citation Formats
O. Gözcü, T. Farsadi, Ö. Şener, and A. Kayran, “Assessment of the Effect of Hybrid GFRP CFRP Usage in Wind Turbine Blades on the Reduction of Fatigue Damage Equivalent Loads in the Wind Turbine System,” presented at the Assessment of the Effect of Hybrid GFRP CFRP Usage in Wind Turbine Blades on the Reduction of Fatigue Damage Equivalent Loads in the Wind Turbine System”, AIAA Science and Technology Forum and Exposition, AIAA SciTech 2015, 33rd Wind Energy Symposium, Kissimmee, Amerika Birleşik Devletleri, 5 - 09 Ocak 2015, Kissimmee, Amerika Birleşik Devletleri, 2015, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/82709.