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Assessment of Research Needs for Wind Turbine Rotor Materials Technology (1991) / Chapter Skim
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5 MANUFACTURING PROCESSES FOR ROTOR BLADES
Pages 81-90

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From page 81...
... Attention to local variations in resin content, fiber curvature, and very local matrix strains that result from the manufacturing process but that are inherent either in the design or the process are germane to understanding fatigue in composite structure. Blade manufacturing methods have been discussed in depth in recent reports (Challis, 1987~.
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From page 82...
... These are local resin content variations, local fiber curvature, and local residual stress. Such conditions are variables in all composite manufacturing processes and should be considered in design.
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From page 83...
... Filament winding processes introduce residual fiber stresses in the fiber matrix assembly that are retained through cure. Each of these phenomena can result in local residual stresses of significance in the matrix.
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From page 84...
... The autoclave high-pressure cure entails an 8-hour cycle time, and both spar and assembly of the trailing and leading edges are separate autoclave cures. Current wind turbine blades are sold for under S10/lb.
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From page 85...
... To live with this constraint, tower blades are made in two parta, an outer section extending from quarter span out to the tip and an inner portion containing a root end joint. These sections are joined by bonding, and both sections are at their largest cross section at the splice joint .
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From page 86...
... Pultrusion Pultruaion is a process in which a continuous dry preform is pulled through a matched die while resin is injected under high pressure. It is first heated for cure and then cooled in the die to a temperature where it pees suf f icient strength to support the pulling clamp pressure .
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From page 87...
... RTM offers slightly longerterm opportunities while retaining aerodynamic efficiency. Fiber placement offers optimum aerodynamic and structural efficiency but will require further development to meet the necessary cost objective=.
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From page 88...
... Matrix strains must be computed and fatigue allowables not exceeded. Quality in fiber alignment, resin content and weight, balance, and contour must be maintained and costs kept low.
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From page 89...
... 1990. Filament Winding and Fiber Placement Technique" Applied to Wind Turbine Blades.
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From page 90...
... 1990. The Effect of the Fracture Process on the Strength of Composite Laminates, 46th American Helicopter Society Forum, May 22.
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Key Terms

  • resin content
  • composite materials
  • fiber placement
  • manufacturing processes
  • turbine blades

  • fatigue life
  • fiber curvature
  • cooling tower
  • failure modes
  • helicopter society

  • local fiber
  • turbine industry
  • american helicopter
  • helicopter blades
  • filament winding

  • design freedom
  • fiber alignment
  • resin stresses
  • helicopter industry
  • current wind

  • residual stress
  • transfer molding
  • tower blades
  • matrix strains
  • turbine rotors

  • manufacturing methods
  • tower fan
  • curved fibers
  • blade life
  • winding processes


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