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Jointed AT Blade. Shu Ching Quek (Presenter) Baehmann Peggy Yerramalli Chandra Miebach Thomas Faidi Waseem General Electric Global Research Center. Logistics of Transporting Blades. $. Lower cost. miles. Jointed Blade. Typical blade length shipping cost. Increases transportability.

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jointed at blade

Jointed AT Blade

Shu Ching Quek (Presenter)

Baehmann Peggy

Yerramalli Chandra

Miebach Thomas

Faidi Waseem

General Electric

Global Research Center

logistics of transporting blades
Logistics of Transporting Blades


Lower cost


Jointed Blade

Typical blade length shipping cost

Increases transportability

  • Key Benefits
  • Standardized joint design
  • Reduce transportation costs
  • Reduce escort and route limitations
  • Competitive feature
ongoing and tested concepts to date
Ongoing and Tested Concepts To Date

LM, TU Delft, WMC

Bolted / Bonded


Blade Freq

Dynamic Response

Root Moment

Bolted / Bonded

Bolted / Bonded


Closer to root causes

high torque / moment

Increases fatigue risks

Field Assembly /


Ease of assembly

Space requirement

Joint Type

Torsional Stiffness

Blade twist

Tailor Blade design

Limited Spar Cap Fab

Enercon E-126 (7+ MW)

Rotor diameter 126 m

Bolted / Bonded

analysis and downselection ctqs
Analysis and Downselection CTQs

Extreme Loads

@ Joint Section

FE Structural Blade Model

Applied to


Loads obtained from GE Structural Group Blade Design Team



Applied to

FE 3D Solid Sub-Component Model of Joint


Joint Component Stresses

Compare to

Respective Material Limits

Jointed AT Blade

Global-Local analysis performed to design and analyze blade joint region

adhesive selection
Adhesive Selection
  • Adhesive requirements
    • Mechanical properties
      • Tensile strength & modulus
      • Shear strength & modulus
      • Peel strength
    • Fatigue performance
    • Process robustness
      • Surface preparation and conditions
      • Environmental conditions
      • Application via injection process
    • Detectable for in-line quality control

Datasheet &

design variables

Application performance

Ready for use in

field assembly

Development focus on process robustness and NDE development

quality control
Quality Control

Joint line

Injection Tube

adhesive flow path

Video clip view window

Ferrite adhesive real-time monitoring and a snap shot of the adhesive flow

Ultrasound scanning system for post cure inspection and c-scan images

Conventional post-cure inspection versus real-time monitoring technology

full scale validation on 2 5mw platform
Full Scale Validation on 2.5MW Platform
  • Strain gages for flap and twist
  • Accelerometers
  • Camera
  • On-tower test
  • On-ground testing for extreme and 20-year fatigue life