R-phase actuated SMA composites in adaptive wind turbine blade trailing edge

Research output: Contribution to conferenceConference articleScientific

Abstract

There is an interest of doubling or quadrupling the rated power of wind turbines from the present maximum of about 5 MW, especially for offshore applications. This increases the blade length to about 80 or 100 m. The growth in size of blades is not feasible using the present technologies and materials. Also the slenderness of wind turbines leads to increased importance of vibration and fatigue control of blades and supporting structures. These increasing requirements call for new structural concepts and advanced materials and also for more adaptive solutions. Better control of the turbine such as advanced blade pitch control or shape control or their combination has to be developed and utilized. The one key issue is reduction of the fatigue loads of blades and that way increasing the life of the structure and enabling use of the turbine at higher wind speeds and gusty winds, which would increase the power production. Shape memory alloy (SMA) composites as morphing structures have been studied widely. In this study possibilities of SMA composites based on utilization of pre-martensitic R-phase transformation were determined. Special treatments to achieve pure R-phase transformation were developed and thermo-mechanical properties of the wires were determined. R-phase actuation has been found to offer several beneficial features compared traditional austenitemartensite transformation. The studies revealed that hysteresis can be remarkably decreased, leading to higher operating frequency at lower temperatures. One of the most important features of R-phase actuated wires is their superior resistance against functional fatigue compared to traditional SMA wires. A novel manufacturing route for SMA composites was developed. Laminate and actuator test structures were designed by FE modeling. R-phase actuated SMA composites were demonstrated at wind turbine blade adaptive trailing edge. In laboratory condition 5° change in camber of trailing edge was achieved when wires were heated up 60 °C. Effect of wind speed on the achieved shape changes was studied by preliminary wind tunnel tests.
Original languageEnglish
Publication statusPublished - 2011
MoE publication typeNot Eligible
Event22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 - Corfu, Greece
Duration: 10 Oct 201112 Oct 2011

Conference

Conference22nd International Conference on Adaptive Structures and Technologies, ICAST 2011
Abbreviated titleICAST 2011
CountryGreece
CityCorfu
Period10/10/1112/10/11

Fingerprint

Shape memory effect
Wind turbines
Turbomachine blades
Wire
Composite materials
Fatigue of materials
Turbines
Phase transitions
Cambers
Wind tunnels
Laminates
Hysteresis
Actuators
Mechanical properties
Temperature

Cite this

Lindroos, T., Karhu, M., Jussila, V., & Sippola, M. (2011). R-phase actuated SMA composites in adaptive wind turbine blade trailing edge. Paper presented at 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , Corfu, Greece.
Lindroos, Tomi ; Karhu, Marjaana ; Jussila, Vilho ; Sippola, Merja. / R-phase actuated SMA composites in adaptive wind turbine blade trailing edge. Paper presented at 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , Corfu, Greece.
@conference{ce3149f40510458dabafa7bd82dc250d,
title = "R-phase actuated SMA composites in adaptive wind turbine blade trailing edge",
abstract = "There is an interest of doubling or quadrupling the rated power of wind turbines from the present maximum of about 5 MW, especially for offshore applications. This increases the blade length to about 80 or 100 m. The growth in size of blades is not feasible using the present technologies and materials. Also the slenderness of wind turbines leads to increased importance of vibration and fatigue control of blades and supporting structures. These increasing requirements call for new structural concepts and advanced materials and also for more adaptive solutions. Better control of the turbine such as advanced blade pitch control or shape control or their combination has to be developed and utilized. The one key issue is reduction of the fatigue loads of blades and that way increasing the life of the structure and enabling use of the turbine at higher wind speeds and gusty winds, which would increase the power production. Shape memory alloy (SMA) composites as morphing structures have been studied widely. In this study possibilities of SMA composites based on utilization of pre-martensitic R-phase transformation were determined. Special treatments to achieve pure R-phase transformation were developed and thermo-mechanical properties of the wires were determined. R-phase actuation has been found to offer several beneficial features compared traditional austenitemartensite transformation. The studies revealed that hysteresis can be remarkably decreased, leading to higher operating frequency at lower temperatures. One of the most important features of R-phase actuated wires is their superior resistance against functional fatigue compared to traditional SMA wires. A novel manufacturing route for SMA composites was developed. Laminate and actuator test structures were designed by FE modeling. R-phase actuated SMA composites were demonstrated at wind turbine blade adaptive trailing edge. In laboratory condition 5° change in camber of trailing edge was achieved when wires were heated up 60 °C. Effect of wind speed on the achieved shape changes was studied by preliminary wind tunnel tests.",
author = "Tomi Lindroos and Marjaana Karhu and Vilho Jussila and Merja Sippola",
note = "Project code: 5377; 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , ICAST 2011 ; Conference date: 10-10-2011 Through 12-10-2011",
year = "2011",
language = "English",

}

Lindroos, T, Karhu, M, Jussila, V & Sippola, M 2011, 'R-phase actuated SMA composites in adaptive wind turbine blade trailing edge' Paper presented at 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , Corfu, Greece, 10/10/11 - 12/10/11, .

R-phase actuated SMA composites in adaptive wind turbine blade trailing edge. / Lindroos, Tomi; Karhu, Marjaana; Jussila, Vilho; Sippola, Merja.

2011. Paper presented at 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , Corfu, Greece.

Research output: Contribution to conferenceConference articleScientific

TY - CONF

T1 - R-phase actuated SMA composites in adaptive wind turbine blade trailing edge

AU - Lindroos, Tomi

AU - Karhu, Marjaana

AU - Jussila, Vilho

AU - Sippola, Merja

N1 - Project code: 5377

PY - 2011

Y1 - 2011

N2 - There is an interest of doubling or quadrupling the rated power of wind turbines from the present maximum of about 5 MW, especially for offshore applications. This increases the blade length to about 80 or 100 m. The growth in size of blades is not feasible using the present technologies and materials. Also the slenderness of wind turbines leads to increased importance of vibration and fatigue control of blades and supporting structures. These increasing requirements call for new structural concepts and advanced materials and also for more adaptive solutions. Better control of the turbine such as advanced blade pitch control or shape control or their combination has to be developed and utilized. The one key issue is reduction of the fatigue loads of blades and that way increasing the life of the structure and enabling use of the turbine at higher wind speeds and gusty winds, which would increase the power production. Shape memory alloy (SMA) composites as morphing structures have been studied widely. In this study possibilities of SMA composites based on utilization of pre-martensitic R-phase transformation were determined. Special treatments to achieve pure R-phase transformation were developed and thermo-mechanical properties of the wires were determined. R-phase actuation has been found to offer several beneficial features compared traditional austenitemartensite transformation. The studies revealed that hysteresis can be remarkably decreased, leading to higher operating frequency at lower temperatures. One of the most important features of R-phase actuated wires is their superior resistance against functional fatigue compared to traditional SMA wires. A novel manufacturing route for SMA composites was developed. Laminate and actuator test structures were designed by FE modeling. R-phase actuated SMA composites were demonstrated at wind turbine blade adaptive trailing edge. In laboratory condition 5° change in camber of trailing edge was achieved when wires were heated up 60 °C. Effect of wind speed on the achieved shape changes was studied by preliminary wind tunnel tests.

AB - There is an interest of doubling or quadrupling the rated power of wind turbines from the present maximum of about 5 MW, especially for offshore applications. This increases the blade length to about 80 or 100 m. The growth in size of blades is not feasible using the present technologies and materials. Also the slenderness of wind turbines leads to increased importance of vibration and fatigue control of blades and supporting structures. These increasing requirements call for new structural concepts and advanced materials and also for more adaptive solutions. Better control of the turbine such as advanced blade pitch control or shape control or their combination has to be developed and utilized. The one key issue is reduction of the fatigue loads of blades and that way increasing the life of the structure and enabling use of the turbine at higher wind speeds and gusty winds, which would increase the power production. Shape memory alloy (SMA) composites as morphing structures have been studied widely. In this study possibilities of SMA composites based on utilization of pre-martensitic R-phase transformation were determined. Special treatments to achieve pure R-phase transformation were developed and thermo-mechanical properties of the wires were determined. R-phase actuation has been found to offer several beneficial features compared traditional austenitemartensite transformation. The studies revealed that hysteresis can be remarkably decreased, leading to higher operating frequency at lower temperatures. One of the most important features of R-phase actuated wires is their superior resistance against functional fatigue compared to traditional SMA wires. A novel manufacturing route for SMA composites was developed. Laminate and actuator test structures were designed by FE modeling. R-phase actuated SMA composites were demonstrated at wind turbine blade adaptive trailing edge. In laboratory condition 5° change in camber of trailing edge was achieved when wires were heated up 60 °C. Effect of wind speed on the achieved shape changes was studied by preliminary wind tunnel tests.

M3 - Conference article

ER -

Lindroos T, Karhu M, Jussila V, Sippola M. R-phase actuated SMA composites in adaptive wind turbine blade trailing edge. 2011. Paper presented at 22nd International Conference on Adaptive Structures and Technologies, ICAST 2011 , Corfu, Greece.